US20070151853A1 - Compositions and Methods for Improving Resolution of Biomolecules Separated on Polyacrylamide Gels - Google Patents

Compositions and Methods for Improving Resolution of Biomolecules Separated on Polyacrylamide Gels Download PDF

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US20070151853A1
US20070151853A1 US11/614,785 US61478506A US2007151853A1 US 20070151853 A1 US20070151853 A1 US 20070151853A1 US 61478506 A US61478506 A US 61478506A US 2007151853 A1 US2007151853 A1 US 2007151853A1
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gel
gels
polyacrylamide
electrophoresis
certain embodiments
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Thomas Beardslee
Timothy Updyke
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Life Technologies Corp
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Invitrogen Corp
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Priority to US13/928,137 priority patent/US9057694B2/en
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Priority to US14/728,471 priority patent/US20160025676A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/447—Systems using electrophoresis
    • G01N27/44756—Apparatus specially adapted therefor
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
    • C07K1/14—Extraction; Separation; Purification
    • C07K1/24—Extraction; Separation; Purification by electrochemical means
    • C07K1/26—Electrophoresis
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/075—Macromolecular gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/447—Systems using electrophoresis
    • G01N27/44704—Details; Accessories
    • G01N27/44747—Composition of gel or of carrier mixture
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/24—Homopolymers or copolymers of amides or imides
    • C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/24—Homopolymers or copolymers of amides or imides
    • C08L33/26—Homopolymers or copolymers of acrylamide or methacrylamide

Definitions

  • This invention relates to electrophoresis methods and apparatus for minimizing skirting effects in an electrophoretic gel.
  • Gel electrophoresis remains a fundamental technique of biochemistry, molecular biology, and cell biology for its usefulness in the separation, characterization, and identification of biomolecules and molecular complexes.
  • Optimal use of gel electrophoresis requires separation of biomolecules with high resolution.
  • One problem confronted by biochemists that employ gel electrophoresis is “skirting”, in which molecules of a sample loaded on the gel migrate between the gel and a gel plate, rather than through the gel itself. This leads to the appearance shadow bands that migrate more quickly than the main bands of the biomolecule or complex that migrate within the gel. This creates ambiguity when images of the gel are analyzed, as it is difficult to know whether such bands are artifacts or the result of a low abundance biomolecule or complex.
  • electrophoresis gels for reducing the skirting effect present in gel electrophoresis.
  • the electrophoresis gels, cassettes and methods provided herein can be used to reduce the skirting effect present in non-denaturing gel electrophoresis.
  • electrophoresis gels, cassettes and methods used to reduce the skirting effect present in denaturing gel electrophoresis are also provided herein.
  • electrophoresis gels for the separation of biomolecules wherein the electrophoresis gels have a stacking gel and a separating gel, and wherein the stacking gel includes linear polyacrylamide.
  • the electrophoresis gels are polyacrylamide gels, wherein the stacking gel and a separating gel are polyacrylamide gels, and wherein the stacking gel includes linear polyacrylamide.
  • the acrylamide concentration of the stacking gel is between about 2% and about 6%, while in further or alternative embodiments the acrylamide concentration of the stacking gel is between about 2.5% and about 5%.
  • the linear acrylamide concentration of the stacking gel is from about 0.005% to about 1%, while in further or alternative embodiments, the linear acrylamide concentration of the stacking gel is from about 0.01% to about 0.5%. In still further or alternative embodiments, the linear acrylamide concentration of the stacking gel is from about 0.02% to about 0.1%. In other embodiments the separating gel does not comprise linear acrylamide.
  • the electrophoresis gel is a denaturing gel
  • the electrophoresis gel is a polyacrylamide gel that is a denaturing gel.
  • such denaturing gels include sodium dodecyl sulfate (SDS).
  • the electrophoresis gel is a non-denaturing gel
  • the electrophoresis gel is a polyacrylamide gel that is a non-denaturing gel.
  • such non-denaturing gels are gradient gels, while in certain embodiments such non-denaturing gels are Blue Native Gels.
  • Another aspect provided herein are methods for separating biomolecules on an electrophoresis gel, wherein such methods include applying one or more samples comprising one or more biomolecules to an electrophoresis gel that includes a stacking gel portion and a separating gel portion, wherein the stacking gel portion comprises linear polyacrylamide; and then electrophoretically separating the one or more biomolecules on the electrophoresis gel.
  • the separating gel does not comprise linear acrylamide.
  • the electrophoresis gel is a denaturing gel
  • the electrophoresis gel is a polyacrylamide gel that is a denaturing gel.
  • such denaturing gels include sodium dodecyl sulfate (SDS).
  • the electrophoresis gel is a non-denaturing gel
  • the electrophoresis gel is a polyacrylamide gel that is a non-denaturing gel.
  • such non-denaturing gels are gradient gels, while in certain embodiments such non-denaturing gels are Blue Native Gels.
  • the methods also include applying one or more molecular weight marker sets to the electrophoresis gel, and in further or alternative embodiments, such methods also include estimating or calculating the molecular weight of one or more biomolecules or biomolecular complexes electrophoreses on the electrophoresis gel.
  • cassettes for performing gel electrophoresis wherein the cassette has a consistent gap width across its cross section.
  • such cassettes have a consistent gap width across their upper edge.
  • such cassettes have a consistent gap width across their upper edge in the range from 0.1 millimeters to 5 millimeters.
  • the gap width of such cassettes varies by less than 5%, while in other embodiments the variation in the gap width of such cassettes is 2% or less.
  • such cassettes contain polyacrylamide gels.
  • such cassettes are used for performing non-denaturing gel electrophoresis, and the gel is a non-denaturing gel.
  • such non-denaturing gels are Blue Native Gels.
  • the gels contained in such cassettes are gradient gels.
  • such gradient gels are polyacrylamide gradient gels.
  • the cassettes are fabricated from plastic, while in further or alternative embodiments the plastic cassettes are fabricated by welding together a front plate to a back plate. In further or alternative embodiments, the welding of the front plate to the back plate results in a cassette with a consistent gap width.
  • Another aspect provided herein are methods for separating biomolecules on an electrophoresis gel, wherein such methods include applying one or more samples comprising one or more biomolecules to an electrophoresis gel contained in a cassette that has a consistent gap width; and then electrophoretically separating the one or more biomolecules on the electrophoresis gel.
  • the cassette has a consistent gap width across its cross section, while in other embodiments such cassettes have a consistent gap width across their upper edge. In certain embodiments of this aspect such cassettes have a consistent gap width across their upper edge in the range from 0.1 millimeters to 5 millimeters. In further or alternative embodiments, the gap width of such cassettes varies by less than 5%, while in other embodiments the variation in the gap width of such cassettes is 2% or less. In further or alternative embodiment, such cassettes contain polyacrylamide gels. In other embodiments, such cassettes are used for performing non-denaturing gel electrophoresis, and the gel is a non-denaturing gel. In certain embodiments, such non-denaturing gels are Blue Native Gels.
  • the gels contained in such cassettes are gradient gels.
  • such gradient gels are polyacrylamide gradient gels.
  • the electrophoresis gel contained in such cassettes includes a stacking gel and a separating gel.
  • such stacking gels include linear acrylamide.
  • the method also includes applying one or more molecular weight marker sets to the electrophoresis gel. In further or alternative embodiments, the methods also include estimating or calculating the molecular weight of one or more biomolecules or biomolecular complexes electrophoreses on the electrophoresis gel. In further or alternative embodiments of such methods, the method also includes staining the gel.
  • FIG. 1 shows 3-12% Blue Native gradient gels made without (top gel) or with (bottom gel) 0.05% linear acrylamide in the stacking gel.
  • FIG. 2 shows a schematic depiction of a cassette ( 21 ) sliced through the middle in which the cassette has a front plate ( 22 ) and a back plate ( 23 ) with a gap in between ( 24 ).
  • FIG. 3 depicts sample proteins/protein complexes and marker proteins separated on a gel run in a cassette that did not have a consistent gap width between plates (A) and a gel run in a cassette that did have a consistent gap width between plates (B).
  • electrophoresis gels Disclosed herein are electrophoresis gels, cassettes and methods used for reducing the skirting effect present in gel electrophoresis.
  • the electrophoresis gels, cassettes and methods provided herein can be used to reduce the skirting effect present in non-denaturing gel electrophoresis, while in other embodiments the electrophoresis gels, cassettes and methods provided herein can be used to reduce the skirting effect present in denaturing gel electrophoresis.
  • ambient temperature refers to the temperature in the range of 20° C. to 25° C.
  • a biopolymer or biomolecule includes, but is not limited to, a nucleic acid, a protein, a polysaccharide, a lipid, and other macromolecules.
  • a nucleic acid includes DNA, RNA, oligonucleotides, and fragments and analogs thereof. Nucleic acid sequences may be derived from genomic DNA, RNA, mitochondrial nucleic acid, chloroplast nucleic acid and other organelles with separate genetic material.
  • chaotropic agent refers to any substance capable of altering the secondary and tertiary structure of proteins and nucleic acids.
  • electrophoresis gel refers to a gel used for electrophoretic separation of a sample.
  • An electrophoresis gel can be a separating gel only, or an electrophoresis gel can include both a stacking gel and a separating gel.
  • Linear polyacrylamide refers to linear, non-crosslinked polymers of acrylamide, and may also be referred to simply as “high molecular weight acrylamide”.
  • Linear acrylamide can be in dry chemical or liquid form (i.e., as a weight/volume solution) with molecular weight ranges from 1,000 Daltons to about 6,000,000 Daltons, corresponding to the lengths of the linear polymers.
  • proteins are complex, three-dimensional substances comprising one or more long, folded polypeptide chains. These chains, in turn, include of small chemical units called amino acids. All amino acids contain carbon, hydrogen, oxygen, and nitrogen. Some also contain sulfur.
  • a “peptide” is a compound that includes two or more amino acids. The amino acids link together in a line to form a peptide chain. There are 20 different naturally occurring amino acids involved in the biological production of peptides, and any number of them can be linked in any order to form a peptide chain. The naturally occurring amino acids employed in the biological production of peptides all have the L-configuration.
  • Synthetic peptides can be prepared employing conventional synthetic methods, using L-amino acids, D-amino acids or various combinations of amino acids of the two different configurations.
  • Some peptide chains contain only a few amino acid units. Short peptide chains, e.g., having less than ten amino acid units, are sometimes referred to as “oligopeptides”, where the prefix “oligo” signifies “few.”
  • Other peptide chains contain a large number of amino acid units, e.g., up to 100 or more, and are referred to a “polypeptides”, where the prefix “poly” signifies “many.”
  • Still other peptide chains, containing a fixed number of amino acid units are referred to using a prefix that signifies the fixed number of units in the chain, e.g., an octapeptide, where the prefix “octa” signifies eight.
  • polypeptide can be considered as any peptide chain containing three or more amino acids, whereas an “oligopeptide” is usually considered as a particular type of “short” polypeptide chain.
  • any reference to a “polypeptide” also includes an oligopeptide.
  • any reference to a “peptide” includes polypeptides, oligopeptides. Each different arrangement of amino acids forms a different polypeptide chain.
  • the polypeptide includes between 40 and 4000 amino acids, between 50 and 3000 amino acids, or between 75 and 2000 amino acids.
  • nucleic acid molecule refers to the phosphate ester polymeric form of ribonucleosides (adenosine, guanosine, uridine or cytidine; “RNA molecules”) or deoxyribonucleosides (deoxyadenosine, deoxyguanosine, deoxythymidine, or deoxycytidine; “DNA molecules”), or any phosphoester analogues thereof, such as phosphorothioates and thioesters, in either single stranded form, or a double-stranded helix. Double stranded DNA-DNA, DNA-RNA and RNA-RNA helices are possible.
  • nucleic acid molecule refers only to the primary and secondary structure of the molecule, and does not limit it to any particular tertiary forms.
  • this term includes double-stranded DNA found, inter alia, in linear or circular DNA molecules (e.g., restriction fragments), plasmids, and chromosomes.
  • sequences may be disclosed herein according to the normal convention of giving only the sequence in the 5′ to 3′ direction along the non-transcribed strand of DNA (i.e., the strand having a sequence homologous to the mRNA).
  • a “recombinant DNA molecule” is a DNA molecule that has undergone a molecular biological manipulation. (see Sambrook et al. Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Laboratory Press).
  • non-denaturing gels refer to electrophoresis gels that do not include denaturing agents (such as, for example, denaturing detergents, urea, formamide, and other chaotropes).
  • denaturing agents such as, for example, denaturing detergents, urea, formamide, and other chaotropes.
  • Non-denaturing (or “native”) gels are commonly used in “native” gel electrophoresis, in which the running buffer and sample buffer also lack denaturants. These gels can be particularly useful in investigating molecular interactions, such as for example, protein:protein interactions, protein-nucleic acid interactions, etc. and for performing in-gel activity assays.
  • polyacrylamide refers to a mixture of acrylamide monomers and N,N′-methylene bis acrylamide (“bis” or “bisacrylamide”), where the acrylamide and bis have been crosslinked to form a branched molecular structure.
  • sample refers to a mixture of a plurality of unique molecular species which can be separated using gel electrophoresis.
  • a sample may be a mixture of nucleic acids, a mixture of oligonucleotides, a mixture of DNA, a mixture of RNA, or combinations thereof.
  • a sample may be a mixture of amino acids, a mixture of peptides, a mixture of proteins, or combinations thereof.
  • separating gel or, alternatively “body of separating gel” refers to the area of the electrophoresis gel in which the separation of biomolecules occurs and in which separated biomolecules of interest are localized after electrophoretic separation has occurred.
  • skirt refers to when a sample is able to migrate between the electrophoresis gel and the wall of the cassette wall, or the plastic or glass plate or plates, holding or containing the gel.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein include a body of separating gel and optionally include a stacking gel.
  • Such separating gels are used to separate sample components including, but not limited to, biomolecules, while the stacking gels are used to help focus the sample components into a narrow band prior to migration into the separating gel. This focusing allows for enhanced resolution of closely migrating sample components.
  • the processes by which the biomolecules separate in the separating gels include, but are not limited to separation by size, separation by charge, or separation by a combination of size and charge. Biomolecules separated using such separating gels are detected by dying, staining or labeling the biomolecules of interest (before, after, or during electrophoretic separation) and observing (visualizing) their position within the separating gel after electrophoretic separation.
  • the dyes, stains, labels or other indicators are added to the sample prior to loading.
  • the dyes, stains, labels or other indicators are added to the loading well or wells, located in the separating gel or the stacking gel, prior to addition of the sample to such loading well or wells.
  • the dyes, stains, labels or other indicators are added to the loading well or wells after to addition of the sample to the loading well or loading wells.
  • the separating gel is exposed to at least one dye, stain, label or other indicator after the electrophoresis run, whereby the sample components become associated with such dyes, stains, labels or other indicators.
  • the dyes, stains, labels or other indicators are added to the separation gel whereby they become associated with the sample components during electrophoretic migration.
  • the dyes, stains, labels or other indicators are covalently attached to the sample components. Visualization of the sample bands in the separating gel is then achieved by illuminating the separating gel with light of appropriate wavelength(s) to allow observation of the dyes, stains, labels or other indicators associated with the sample bands.
  • the separating gels of the compositions, gel cassettes and methods disclosed herein can comprise any material which forms a gel including, but not limited to, synthetic polymers, natural polymers and combinations thereof.
  • synthetic polymers include, but are not limited to, linear polyacrylamide, crosslinked polyacrylamide, and combinations thereof.
  • natural polymers include, but are not limited to, polysaccharides such as agarose.
  • such separating gels can comprise agarose, polyacrylamide, or combinations of agarose and polyacrylamide.
  • such separating gels can comprise agarose, polyacrylamide, or combinations of agarose and polyacrylamide.
  • the separating gels can comprise linear acrylamide and agarose, linear acrylamide and polyacrylamide, or linear acrylamide and a combination of agarose and polyacrylamide.
  • the stacking gels of the compositions, gel cassettes and methods disclosed herein can comprise any material which forms a gel including, but not limited to, synthetic polymers, natural polymers and combinations thereof.
  • synthetic polymers include, but are not limited to, linear polyacrylamide, crosslinked polyacrylamide or combinations thereof.
  • natural polymers include, but are not limited to, polysaccharides such as agarose.
  • stacking gels can comprise agarose, polyacrylamide, or combinations of agarose and polyacrylamide.
  • the stacking gels comprise linear acrylamide and agarose, linear acrylamide and polyacrylamide, or linear acrylamide and a combination of agarose and polyacrylamide.
  • the electrophoresis gels include a separating gel and a stacking gel, in which the stacking gel includes linear polyacrylamide.
  • the stacking gel includes linear polyacrylamide. The inclusion of linear acrylamide in the stacking gel minimizes or prevents skirting artifacts.
  • the separating and stacking gels are polyacrylamide gels, where the stacking gel also includes linear polyacrylamide. In certain embodiments of the compositions, gel cassettes and methods disclosed herein, the separating and stacking gels are polyacrylamide gels, where the separating gel also includes linear polyacrylamide. In certain embodiments of the compositions, gel cassettes and methods disclosed herein, the separating and stacking gels are polyacrylamide gels, where both the separating gel and the stacking gel include linear polyacrylamide.
  • the polyacrylamide gels of the compositions, gel cassettes and methods disclosed herein are made using solutions of “acrylamide” that are mixtures of monomeric acrylamide and bisacrylamide.
  • the ratios of monomeric acrylamide to bisacrylamide used in the mixtures to make the polyacrylamide gels of the compositions, gel cassettes and methods disclosed herein range from about 15:1 to about 50:1.
  • the (monomeric) acrylamide:bisacrylamide ratio in such polyacrylamide gels can be 15:1, 19:1, 24:1, 29:1, 37.5:1, 40:1, 45:1 and 50:1.
  • the ratios of (monomeric) acrylamide to bisacrylamide for the analysis of proteins and protein complexes are in the range from about 19:1 to about 45:1.
  • the stacking gel comprises polyacrylamide made using the mixtures of acrylamide and bisacrylamide as described above.
  • the stacking gel is made with lower acrylamide concentration than that used to make the separating gel.
  • stacking gels can have (w/v) acrylamide concentrations ranging from about 2% to about 8%, from about 2.5% to about 7.5% acrylamide, from about 3% to about 7% acrylamide, from about 3.5% to about 6.5% acrylamide, from about 4% to about 6% acrylamide, from about 4.5% to about 5.5% acrylamide, or from about 2.5% to about 6% acrylamide.
  • stacking gels can have (w/v) acrylamide concentrations ranging from 2% to 8%, from 2.5% to 7.5% acrylamide, from 3% to 7% acrylamide, from 3.5% to 6.5% acrylamide, from t 4% to 6% acrylamide, from 4.5% to 5.5% acrylamide, or from 2.5% to 6% acrylamide.
  • the separating gels and stacking gels (individually or together) of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein include linear polyacrylamide.
  • the polyacrylamide separating gels and polyacrylamide stacking gels (individually or together) of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein include linear polyacrylamide.
  • the (w/vol) concentrations of the linear acrylamide included in such gels can range from about 0.005% to about 1%, 0.005% to about 0.75%, 0.005% to about 0.5%, 0.005% to about 0.1%, 0.01% to about 1%, 0.01% to about 0.75%, 0.01% to about 0.5%, 0.01% to about 0.1%, 0.02% to about 1%, 0.02% to about 0.75%, 0.02% to about 0.5%, 0.02% to about 0.2%, or 0.02% to about 0.1%.
  • the (w/vol) concentrations of the linear acrylamide included in such gels can range from 0.005% to 1%, 0.005% to 0.75%, 0.005% to 0.5%, 0.005% to 0.1%, 0.01% to 1%, 0.01% to 0.75%, 0.01% to 0.5%, 0.01% to 0.1%, 0.02% to 1%, 0.02% to 0.75%, 0.02% to 0.5%, 0.02% to 0.2%, or 0.02% to 0.1%.
  • the molecular weight of the linear acrylamide included in such gels can range from about 1,000 Daltons to about 6,000,000 Daltons, from about 1,000 Daltons to about 5,000,000 Daltons, from about 1,000 Daltons to about 2,000,000 Daltons, from about 1,000 Daltons to about 1,000,000 Daltons, from about 1,000 Daltons to about 750,000 Daltons, from about 1,000 Daltons to about 500,000 Daltons, from about 1,000 Daltons to about 300,000 Daltons, from about 1,000 Daltons to about 200,000 Daltons, from about 1,000 Daltons to about 100,000 Daltons, from about 1,000 Daltons to about 50,000 Daltons, from about 1,000 Daltons to about 25,000 Daltons, or from about 1,000 Daltons to about 10,000 Daltons.
  • the molecular weight of the linear acrylamide included in such gels can range from 1,000 Daltons to 6,000,000 Daltons, from 1,000 Daltons to 5,000,000 Daltons, from 1,000 Daltons to 2,000,000 Daltons, from 1,000 Daltons to 1,000,000 Daltons, from 1,000 Daltons to 750,000 Daltons, from 1,000 Daltons to 500,000 Daltons, from 1,000 Daltons to 300,000 Daltons, from 1,000 Daltons to 200,000 Daltons, from 1,000 Daltons to 100,000 Daltons, from 1,000 Daltons to 50,000 Daltons, from 1,000 Daltons to 25,000 Daltons, or from 1,000 Daltons to 10,000 Daltons.
  • a skilled artisan can test linear acrylamide of various molecular weight ranges to determine useful molecular weights for linear polyacrylamide used in stacking gels.
  • the molecular weight of linear polyacrylamide used in the stacking gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein is greater than about 10,000 Daltons. In some embodiments, the molecular weight of linear polyacrylamide used in the stacking gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein is greater than about 100,000 Daltons. In some exemplary embodiments, the molecular weight of linear polyacrylamide used in the stacking gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein is between about 100,000 Daltons and about 1,000,000 Daltons.
  • the molecular weight of linear polyacrylamide used in the stacking gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein is between about 600,000 Daltons and about 1,000,000 Daltons. In some exemplary embodiments, the molecular weight of linear polyacrylamide used in the stacking gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein is between 600,000 Daltons and 1,000,000 Daltons.
  • the polyacrylamide separating gels and polyacrylamide stacking gels that include linear acrylamide are made by the polymerization of a mixture that includes at least the following mixture of linear acrylamide, monomeric acrylamide, bisacrylamide crosslinker, and a polymerization initiator or initiators.
  • This mixture can optionally include a catalyst.
  • Polymerization of such mixtures can be initiated by any suitable means which are well known to those skilled in the art including, chemical initiation by adding suitable agents and optional catalysts; photochemical initiation using a photoinitiator followed by irradiation at a suitable wavelength; thermal initiation, and combinations thereof. Polymerization of such mixtures incorporates the linear acrylamide into the polymerized gel; thereby strengthening the gel.
  • the incorporation of linear acrylamide into the stacking gel reduces or eliminates the skirting effect.
  • the chemical initiators that can be used to initiate the polymerization of such mixtures includes, but are not limited to ammonium persulfate, ammonium persulfate and tetramethylethylenediamine (TEMED) mixtures, sodium persulfate, sodium persulfate and tetramethylethylenediamine (TEMED) mixtures, potassium persulfate, potassium persulfate and tetramethylethylenediamine mixtures, peroxides, benzyl peroxide, dicumyl peroxide, azobis [2-(2-imidazolin-2-yl) propane] HCl (AZIP), azobis (2-amidinopropane) HCl (AZAP), 4,4′-azo-bis-4-cyanopentanoic acid, azobisisobutyramide; azobisisobutyramidine.2HCl, 2-2′-azo-bis-2-(methylcarboxy) propane, 2-hydroxy-1-[4-(hydroxyethoxy)pheny
  • the photoinitiators that can be used to initiate the polymerization of such mixtures includes, but are not limited to, acetophenones, benzophenones, multi-ringed quinones, fluoresceins, azobisnitriles, benzoquinones, xanthophenones, benzoins, xanthones, fluoroenones, anthroquinones, eosin, erythrosin, nitroxides, ribolflavin, riboflavin 5′-phosphate, and derivatives thereof.
  • the linear acrylamide is added to a monomeric acrylamide solution prior to adding bisacrylamide crosslinker, initiator(s), and optional catalyzing agent(s), thereby resulting in the mixture of linear acrylamide, monomeric acrylamide, bisacrylamide crosslinker, polymerization initiator(s) and optional catalyst(s) used to make polyacrylamide separating gels and polyacrylamide stacking gels that includes linear acrylamide as disclosed herein.
  • the linear acrylamide is added to a monomeric acrylamide solution prior to adding bisacrylamide crosslinker, ammonium persulfate and tetramethylethylenediamine (TEMED), thereby resulting in the mixture used to make polyacrylamide separating gels and polyacrylamide stacking gels that includes linear acrylamide as disclosed herein.
  • bisacrylamide crosslinker ammonium persulfate and tetramethylethylenediamine (TEMED)
  • the linear acrylamide is added to a solution of monomeric acrylamide solution and bisacrylamide crosslinker prior to adding initiator(s) and optional catalyzing agent(s), thereby resulting in the mixture of linear acrylamide, monomeric acrylamide, bisacrylamide crosslinker, polymerization initiator(s) and a catalyst (s) used to make polyacrylamide separating gels and polyacrylamide stacking gels that includes linear acrylamide as disclosed herein.
  • t he linear acrylamide is added to a solution of monomeric acrylamide solution and bisacrylamide crosslinker prior to adding ammonium persulfate and tetramethylethylenediamine (TEMED), thereby resulting in the mixture used to make polyacrylamide separating gels and polyacrylamide stacking gels that includes linear acrylamide as disclosed herein.
  • TEMED tetramethylethylenediamine
  • the linear acrylamide is added to a solution of monomeric acrylamide solution, bisacrylamide crosslinker, initiator(s), and optional catalyzing agent(s), thereby resulting in the mixture of linear acrylamide, monomeric acrylamide, bisacrylamide crosslinker, polymerization initiator(s) and optional catalyst(s) used to make polyacrylamide separating gels and polyacrylamide stacking gels that includes linear acrylamide as disclosed herein.
  • the linear acrylamide is added to a solution of monomeric acrylamide, bisacrylamide crosslinker, ammonium persulfate and tetramethylethylenediamine (TEMED), thereby resulting in the mixture used to make polyacrylamide separating gels and polyacrylamide stacking gels that includes linear acrylamide as disclosed herein.
  • TEMED tetramethylethylenediamine
  • the electrophoresis gels of the compositions, gel cassettes and methods disclosed herein can be gradient separating gels, in which the concentration of the polymer (exclusive of the concentration of any added linear polymer) varies through the separating gel, generally from low concentration at the top of the gel body to high concentration at the bottom of the gel body.
  • concentration range of the polymer in such gradient separating gels depends on the application, and in particular the size of the molecules to be separated.
  • such separating gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can be gradient polyacrylamide separating gels having a concentration gradient with (w/v) acrylamide concentrations ranging from about 2% to about 30%, from about 2.5% to 25%, from about 3% to about 20%, from about 3% to about 8%, from about 4% to about 16%, from about 3% to about 12%, from about 4% to about 20%, or from about 5% to about 20%.
  • such separating gel of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can be gradient polyacrylamide separating gels having a concentration gradient with (w/v) acrylamide concentrations ranging from 2% to 30%, from 2.5% to 25%, from 3% to 20%, from 3% to 8%, from 4% to 16%, from 3% to 12%, from 4% to 20%, or from 5% to 20%.
  • the electrophoresis gels of the compositions, gel cassettes and methods disclosed herein can include both a gradient separating gel and a stacking gel, wherein the concentration of the stacking gel polymer is equal to or less than the lowest concentration of polymer used in the gradient separating gel.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein includes both a polyacrylamide gradient separating gel and a polyacrylamide stacking gel, wherein the concentration of the acrylamide in the stacking gel is equal to or less than the lowest concentration of acrylamide used in the gradient separating gel.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein includes both a polyacrylamide gradient separating gel and a polyacrylamide stacking gel, wherein the concentration of the acrylamide in the stacking gel is equal to or less than the lowest concentration of acrylamide used in the gradient separating gel, and the stacking gel includes linear polyacrylamide at a (w/v) concentration of from about 0.005% to about 1%, 0.005% to about 0.75%, 0.005% to about 0.5%, 0.005% to about 0.1%, 0.01% to about 1%, 0.01% to about 0.75%, 0.01% to about 0.5%, 0.01% to about 0.5%, 0.01% to about 0.1%, 0.02% to about 1%, 0.02% to about 0.75%, 0.02% to about 0.5%, 0.02% to about 0.5%, 0.02% to about 0.2% or 0.02% to about 0.1%.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein includes both a polyacrylamide gradient separating gel and a polyacrylamide stacking gel, wherein the concentration of the acrylamide in the stacking gel is equal to or less than the lowest concentration of acrylamide used in the gradient separating gel, and the stacking gel includes linear polyacrylamide at a (w/v) concentration of from 0.005% to 1%, 0.005% to 0.75%, 0.005% to 0.5%, 0.005% to 0.1%, 0.01% to 1%, 0.01% to 0.75%, 0.01% to 0.5%, 0.01% to 0.5%, 0.01% to 0.1%, 0.02% to 1%, 0.02% to 0.75%, 0.02% to 0.5%, 0.02% to 0.5%, 0.02% to 0.2% or 0.02% to 0.1%.
  • an electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can include a slab gradient polyacrylamide separating gel comprising a polyacrylamide concentration of 4%-16%, and a polyacrylamide stacking gel with a concentration of 3% polyacrylamide plus 0.05% (weight/volume) of linear polyacrylamide.
  • the gradient separating gels of the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can also include linear acrylamide present in a (w/v) concentration of from about 0.005% to about 1%, 0.005% to about 0.75%, 0.005% to about 0.5%, 0.005% to about 0.1%, 0.01% to about 1%, 0.01% to about 0.75%, 0.01% to about 0.5%, 0.01% to about 0.1%, 0.02% to about 1%, 0.02% to about 0.75%, 0.02% to about 0.5%, 0.02% to about 0.1%, or 0.02% to about 0.1%.
  • such gradient separating gels include linear acrylamide present in a (w/v) concentration of from 0.005% to 1%, 0.005% to 0.75%, 0.005% to 0.5%, 0.005% to 0.1%, 0.01% to 1%, 0.01% to 0.75%, 0.01% to 0.5%, 0.01% to 0.1%, 0.02% to 1%, 0.02% to 0.75%, 0.02% to 0.5%, 0.02% to 0.1%, or 0.02% to 0.1%.
  • such gradient separating gels are polyacrylamide gradient separating gels having a concentration gradient with (w/v) acrylamide concentrations ranging from about 2% to about 30%, from about 2.5% to 25%, from about 3% to about 20%, from about 3% to about 8%, from about 4% to about 16%, from about 3% to about 12%, from about 4% to about 20%, or from about 5% to about 20%.
  • such gradient separating gels are polyacrylamide gradient separating gels having a concentration gradient with (w/v) acrylamide concentrations ranging from 2% to 30%, from 2.5% to 25%, from 3% to 20%, from 3% to 8%, from 4% to 16%, from 3% to 12%, from 4% to 20%, or from 5% to 20%.
  • the electrophoresis gels comprise a stacking gel and a separating gel, in which linear acrylamide is present only in the stacking gel and is not present in the separating gel.
  • such stacking gels and separating gels both comprise polyacrylamide, but only the stacking gel comprises linear acrylamide.
  • the addition of linear acrylamide in the separating gel can potentially affect the transparency of the separating gel and thereby affect the detection of sample bands located in the separating gel. Such affects are also known as “clouding” effects.
  • the polyacrylamide stacking gel contains the lowest concentration of acrylamide, with respect to the acrylamide concentration range of the polyacrylamide separating gel.
  • the total acrylamide (acrylamide: bisacrylamide) concentration is below about 3.5% (w/v)
  • the resulting polyacrylamide matrix is a soft gel that, in addition to being prone to breakage, may also result in skirting artifacts.
  • the inclusion of linear polyacrylamide in such low percentage acrylamide stacking gels can improve the strength of the gels and may also reduce or eliminate the occurrence of skirting artifacts.
  • the electrophoresis gels used in the compositions, gel cassettes and methods can include separating gels that are non-denaturing gels.
  • such non-denaturing separating gels comprise linear polyacrylamide
  • such non-denaturing separating gels are polyacrylamide separating gels that comprise linear polyacrylamide.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can include stacking gels that are non-denaturing gels.
  • such non-denaturing stacking gels comprise linear polyacrylamide
  • such non-denaturing stacking gels are polyacrylamide stacking gels that comprise linear polyacrylamide.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can include both separating gels and stacking gels that are non-denaturing gels.
  • such non-denaturing separating gels and stacking gels comprise linear polyacrylamide
  • such non-denaturing separating gels and stacking gels are polyacrylamide separating gels and stacking gels, wherein the stacking gel comprises linear polyacrylamide.
  • such non-denaturing separating gels and stacking gels are polyacrylamide separating gels and stacking gels that comprise linear polyacrylamide.
  • Non-denaturing gels used to separate proteins and protein complexes are Blue native gels (“BN gels”).
  • BN gels have been described by Schagger H and von Jagow G (1991) “Blue native electrophoresis for isolation of membrane protein complexes in enzymatically active form” Anal. Biochem. 199: 223-231; Schagger H, Cramer W A, and von Jagow G (1994) “Analysis of molecular masses and oligomeric states of protein complexes by blue native electrophoresis and isolation of membrane protein complexes by two-dimensional native electrophoresis” Anal. Biochem.
  • such electrophoresis gels are non-denaturing Blue Native polyacrylamide gels that include linear polyacrylamide in the stacking gel, and are used for the separation of proteins and protein complexes.
  • the non-denaturing gels, including BN gels include gradient separating gels having a concentration gradient with (w/v) acrylamide concentrations ranging from about 2% to about 30%, from about 2.5% to 25%, from about 3% to about 20%, from about 3% to about 8%, from about 4% to about 16%, from about 3% to about 12%, from about 4% to about 20%, or from about 5% to about 20%.
  • the non-denaturing gels include gradient separating gels having a concentration gradient with (w/v) acrylamide concentrations ranging from 2% to 30%, from 2.5% to 25%, from 3% to 20%, from 3% to 8%, from 4% to 16%, from 3% to 12%, from 4% to 20%, or from 5% to 20%.
  • such non-denaturing gels include stacking gels having an acrylamide (w/v) concentration of from about 1% to about 6% in concentration, from about 2% to about 5%, or from about 2.5% to about 4% polyacrylamide.
  • non-denaturing gels include stacking gels having an acrylamide (w/v) concentration of from 1% to 6% in concentration, from 2% to 5%, or from 2.5% to 4% polyacrylamide.
  • stacking gels also include linear polyacrylamide at a (w/v) concentration of from about 0.005% to about 1%, 0.005% to about 0.75%, 0.005% to about 0.5%, 0.005% to about 0.1%, 0.01% to about 1%, 0.01% to about 0.75%, 0.01% to about 0.5%, 0.01% to about 0.5%, 0.01% to about 0.5%, 0.01% to about 0.1%, 0.02% to about 1%, 0.02% to about 0.75%, 0.02% to about 0.5%, from about 0.02% to about 0.2%, or 0.02% to about 0.1%.
  • such stacking gels also include linear polyacrylamide at a (w/v) concentration of from 0.005% to 1%, 0.005% to 0.75%, 0.005% to 0.5%, 0.005% to 0.1%, 0.01% to 1%, 0.01% to 0.75%, 0.01% to 0.5%, 0.01% to 0.1%, 0.02% to 1%, 0.02% to 0.75%, 0.02% to 0.5%, from 0.02% to 0.2%, or 0.02% to 0.1%.
  • the separating gel which can be a gradient gel, does not include linear acrylamide.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can be denaturing gels, wherein the gels includes a detergent(s), chaotropic agent(s) or combinations thereof.
  • Chaotropic agents include, but are not limited to, sodium trifluoroacetate, sodium perchlorate, sodium iodide, urea, guanidinium chloride and guanidine isothiocyanate.
  • Denaturing detergents include, but are not limited to, sodium dodecyl sulfate (SDS).
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can include separating gels that are denaturing gels.
  • denaturing separating gels comprise linear polyacrylamide
  • denaturing separating gels are polyacrylamide separating gels that comprise linear polyacrylamide.
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can include stacking gels that are denaturing gels.
  • denaturing stacking gels comprise linear polyacrylamide
  • polyacrylamide stacking gels that comprise linear polyacrylamide
  • the electrophoresis gels used in the compositions, gel cassettes and methods disclosed herein can include both separating gels and stacking gels that are denaturing gels.
  • denaturing separating gels and stacking gels comprise linear polyacrylamide
  • denaturing separating gels and stacking gels are polyacrylamide separating gels and stacking gels, wherein the stacking gel comprises linear polyacrylamide.
  • denaturing separating gels and stacking gels are polyacrylamide separating gels and stacking gels that comprise linear polyacrylamide.
  • FIG. 2 shows a cassette ( 21 ) that has been cut down the middle, in which the gap ( 24 ) between the back plate ( 23 ) and the front plate ( 22 ) is substantially the same between a point along the upper edge ( 25 ) of the cassette that is in the middle of the cassette ( 27 ) and a point along the upper edge ( 25 ) of the cassette that is at the outer edge of the cassette ( 26 ).
  • a “consistent internal gap between the front and back plates” of a cassette means that the space within a cassette that holds the gel has substantially the same front-to-back depth throughout the space containing the gel.
  • the front-to-back depth at the top edge of the space is substantially the same as the front-to-back depth in the mid-region of the space, the bottom region of the space and the outer edges of the space.
  • the internal gap width between plates at the top edge of the cassette does not vary by more than about 5% of the greatest gap width between an edge of the cassette and the central region of the cassette, and preferably does not vary by more than about 2% of the internal width between the two plates from the edges of the cassette to the mid region of the cassette.
  • the gap width between the front and back plate does not vary by more than about 1% across the top of the cassette (or the region of the cassette corresponding to where a comb can be inserted to form sample wells).
  • a cassette may be designed to hold a gel of 1 mm thickness, which corresponds to the internal gap width of the cassette.
  • the width of the internal space of the cassette does not vary by more than about 0.05 mm, by more than about 0.02 mm, or by more than about 0.01 mm across the top of the cassette (or the region of the cassette corresponding to where a comb is inserted).
  • a cassette may be designed to hold a gel of 1.5 mm thickness.
  • the width of the internal space of the cassette does not vary by more than about 0.075 mm, by more than about 0.03 mm, or by more than about 0.015 mm across the top of the cassette (or the region of the cassette corresponding to where a comb is inserted).
  • the gel cassette has an internal gap between the front and back plates in which the internal distance between the front and back plates does not substantially vary along the upper edge of the cassette.
  • a gel cassette can have front and back plates constructed of any suitable material, where suitable materials include plastics, polymers, glass, ceramics, or any material that is not permeable to fluids and is non-conducting under standard electrophoresis conditions.
  • suitable materials include plastics, polymers, glass, ceramics, or any material that is not permeable to fluids and is non-conducting under standard electrophoresis conditions.
  • the gel cassettes disclosed herein can be made of a polymer which is transparent to visible light, transparent to ultraviolet light, transparent to infra-red light, or transparent to both visible and ultraviolet light.
  • Non-limiting examples of polymers used to make the gel cassettes disclosed herein are styrene acrylonitrile (SAN), polycarbonate, polystyrene, acrylic based polymers, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), glycol-modified polyethylene terephthalate (PETG), polypropylene, Acetel and copolymers thereof.
  • SAN styrene acrylonitrile
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • PET glycol-modified polyethylene terephthalate
  • polypropylene Acetel and copolymers thereof.
  • the plates of the gel cassettes disclosed herein can be coated on the gel-facing side with one or more polymers such as, by way of example only, latex, thereby preventing sticking of the gel to the plates when the gel is to be removed after electrophoresis.
  • the gel cassettes or the plates that will be attached to form a gel cassette, disclosed herein, may be fabricated using molding techniques, hot embossing methods, casting processes, thermoforming methods, stereolithography processes, machining methods and milling processes.
  • molding techniques include injection molding and compression molding.
  • the front and back plates can be attached to one another (to form a gel cassette) by any feasible means including, but not limited to, being molded as a single piece along with edge pieces that connect the front and back plates at the side, being welded together (by way of example only, ultrasonic welding), being fastened together with adhesives, being thermally treated, or being held with attachment means screws, pins, snaps, or clamps.
  • either or both of the front and back plates of the cassette have raised borders around the edges where the cassettes are attached, by way of example only, by welding, that provide spacers that establish the distance between the attached plates.
  • the plates so designed are welded together to specifications such that the spacer thickness establishing the distance between plates of the cassette is substantially the same from the outer edges of the cassette to at least the midpoint of the cassette along the upper edge of the cassette.
  • the gel cassette disclosed herein can be of any size used in any electrophoresis system.
  • the dimensions of a gel cassette having a consistent gap width are not limiting and include, but are not limited to, gel cassette having a front plate and back plates from about 5 cm to about 30 cm in width, from about 5 cm to about 60 cm in length, and from about 1 mm to about 5 mm in plate thickness.
  • the plates of the gel cassette can be about 4 mm thick or less, about 3 mm thick or less, about 2.5 mm thick or less, about 2 mm thick or less, about 1.5 mm thick or less, or about 1 mm thick or less.
  • the back plate of a cassette is between 2.5 mm and 3 mm thick in the area containing the gel
  • the front plate of a cassette is between 1.5 and 2 mm thick in the area containing the gel.
  • the front plate and back plate need not be of equal dimensions.
  • the front plate, the back plate, or both can be irregularly shaped along one or more sides such as, by way of example only, having at least a portion of an outer edge that is inset or curved.
  • the gap width between plates of an assembled cassette can be from about 0.1 mm to about 10 mm, from about 0.1 mm to about 5 mm, from about 0.25 mm to about 5 mm, from about 0.25 mm to about 3 mm, from about 0.25 mm to about 2.5 mm, from about 0.25 mm to about 2 mm, from about 0.25 mm to about 1.5 mm, from about 0.25 mm to about 1 mm, from about 0.5 mm to about 5 mm, from about 0.5 mm to about 3 mm, from about 0.5 mm to about 2.5 mm, from about 0.5 mm to about 2 mm, from about 0.5 mm to about 1.5 mm, or from about 0.5 mm to about 1 mm.
  • the gap width between plates of an assembled cassette is from 0.1 mm to 10 mm, from 0.1 mm to 5 mm, from 0.25 mm to 5 mm, from 0.25 mm to 3 mm, from 0.25 mm to 2.5 mm, from 0.25 mm to 2 mm, from 0.25 mm to 1.5 mm, from 0.25 mm to 1 mm, from 0.5 mm to 5 mm, from 0.5 mm to 3 mm, from 0.5 mm to 2.5 mm, from 0.5 mm to 2 mm, from 0.5 mm to 1.5 mm, or from 0.5 mm to 1 mm.
  • the gap width can be established by spacers between the plates along the outer edges of the plates (top and bottom), or by border regions of the plates (top and bottom) that can be fastened together using welding methods (by way of example only, ultrasonic welding), thermal treatment, adhesives, gaskets, clamps, or fasteners.
  • the cassette plates are made of one or more plastics such as, for example, and one or both of the back plate or the front plate has a raised border region that is welded or heat fused to the partner plate, and the welding process in part determines the gap width by determining the thickness of the border region that remains between the welded or heat fused plates of the cassette.
  • a non-limiting example of a gel cassette having a consistent internal gap between the front and back plates has front and back plates that are 10 cm ⁇ 10 cm, where the front plate is about 1.75 mm thick and the back plate is about 2.55 mm thick, and the two plates are welded together such that the gap width of the cassette in the region where a comb is to be inserted to form wells is consistently about 1 mm.
  • a gel cassette having a consistent internal gap between the front and back plates has front and back plates that are 10 cm ⁇ 10 cm, where the front and back plates are about 1.75 mm and about 2.5 mm thick, respectively, and the plates welded together such that the gap width of the cassette is consistently about 1.5 mm.
  • a gel cassette having a consistent internal gap between the front and back plates has front and back plates that are 15 cm ⁇ 15 cm, where the front and back plates are about 1.75 mm and about 2.55 mm thick, respectively, and the two plates are welded together such that the gap width of the cassette in the region where a comb is to be inserted to form wells is consistently about 1 mm.
  • a gel cassette having a consistent internal gap between the front and back plates has front and back plates that are 15 cm ⁇ 15 cm, where the front and back plates are about 1.75 mm and about 2.55 mm thick, respectively, and the two plates are welded together such that the gap width of the cassette in the region where a comb is to be inserted to form wells is consistently about 1.5 mm.
  • the gel cassettes disclosed herein also include gel cassettes having a consistent gap width across the upper edge of the cassette where sample loading occurs, wherein the gap width varies by less than about 5%, in some preferred embodiments by no more than about 2% or by no more than about 1%.
  • the gel cassettes with a consistent gap widths disclosed herein can contain a gel that comprises any suitable gel forming polymer, including, but not limited to, synthetic polymers, natural polymers and combinations thereof.
  • synthetic polymers include, but are not limited to, linear polyacrylamide, crosslinked polyacrylamide, or combinations thereof.
  • natural polymers include, but are not limited to, polysaccharides such as agarose.
  • gels can comprise agarose, polyacrylamide, or combinations of agarose and polyacrylamide.
  • the gel cassettes with a consistent gap widths disclosed herein can contain any stacking gel and/or separating gel disclosed herein.
  • the gel cassettes contain gels that includes linear acrylamide, as described herein.
  • linear acrylamide can be present in the stacker and not in the separating gel.
  • linear acrylamide can be present in the stacker and in the separating gel.
  • the gel can be of any polymer concentration as disclosed herein including, by way of example only, from about 0.3% to about 3% in the case of agarose, or from about 1% to about 30% acrylamide.
  • the linear acrylamide can be present at any (w/v) concentration disclosed herein including, but not limited to, from about 0.005% to about 1% and from about 0.01% to about 0.5%.
  • the separating gel in gel cassettes with a consistent gap widths disclosed herein can be a gradient gel as disclosed herein.
  • the separating gel in gel cassettes with a consistent gap widths disclosed herein can optionally include a stacking gel as disclosed herein, where the stacking gel has a lower concentration of gel polymer than that in the separating gel. Where combination gels are used, optimal concentrations of each component can be determined empirically or as guided by published protocols.
  • a gel contained in a gel cassette as described herein can also include at least one of the following: one or more buffers, salts, reducing agents, oxidizing agents, alkylating agents, denaturants, chelators, polymers, or detergents.
  • a gel contained in such cassettes is a gel to be used for separation of nucleic acids.
  • a gel contained in such cassettes is a gel to be used for polypeptide electrophoresis.
  • a gel contained in such cassettes is used for native electrophoresis of proteins, in which proteins and protein complexes are not denatured prior to or during electrophoresis.
  • a gel contained in such cassette is a gel to be used for polypeptide electrophoresis.
  • a gel contained in such cassettes is used for native electrophoresis of proteins, in which proteins and protein complexes are not denatured prior to or during electrophoresis and the gel and the running buffer(s) do not include denaturants, such as but not limited to denaturing detergents, urea, formamide, chaotropes, and the like.
  • Blue Native gels are used in cassettes described herein having a consistent internal gap width.
  • the Blue Native gels have stacking gels.
  • the Blue Native gels have stacking gels that include linear acrylamide.
  • the buffer or buffers included in gels that are contained in gel cassettes as described herein can be any electrophoresis buffer, including but not limited zwitterionic buffers.
  • the gel buffer has a pH between 5 and 9 at ambient temperature. In certain embodiments the gel buffer has a pH between 6 and 8.5 at ambient temperature. In certain embodiments the gel buffer has a pH between 6 and 8 at ambient temperature. In certain embodiments the gel buffer has a pH between 6 and 7 at ambient temperature. In certain embodiments the gel buffer has a pH between 7 and 8 at ambient temperature. In certain embodiments the gel buffer has a pH between 5 and 9 at 25° C. In certain embodiments the gel buffer has a pH between 6 and 8.5 at 25° C. In certain embodiments the gel buffer has a pH between 6 and 8 at 25° C. In certain embodiments the gel buffer has a pH between 7 and 8 at 25° C. In certain embodiments the gel buffer has a pH between 6 and 7 at 25° C. In certain embodiments the gel buffer has a pH between 6 and 7 at 25
  • the buffer or buffers included in gels that are contained in gel cassettes as described herein comprises a buffer having a pKa between about 5 and about 8.5 at ambient temperature.
  • the gel buffer comprises a buffer having a pKa between about 6 and about 8.5 at ambient temperature.
  • the gel buffer comprises a buffer having a pKa between about 6 and about 8 at ambient temperature.
  • the gel buffer comprises a buffer having a pKa between about 6 and about 7 at ambient temperature.
  • the gel buffer comprises a buffer having a pKa between about 7 and about 8 at ambient temperature.
  • the gel buffer comprises a buffer having a pKa between about 5 and about 8.5 at 25° C.
  • the gel buffer comprises a buffer having a pKa between about 6 and about 8.5 at 25° C. In certain embodiments the gel buffer comprises a buffer having a pKa between about 6 and about 8 at 25° C. In certain embodiments the gel buffer comprises a buffer having a pKa between about 6 and about 7 at 25° C. In certain embodiments the gel buffer comprises a buffer having a pKa between about 7 and about 8 at 25° C.
  • the buffer or buffers included in gels that are contained in gel cassettes as described herein include, but are not limited to, succinate, citrate, borate, maleate, cacodylate, N-(2-Acetamido)iminodiacetic acid (ADA), 2-(N-morpholino)-ethanesulfonic acid (MES), N-(2-acetamido)-2-aminoethanesulfonic acid (ACES), piperazine-N,N′-2-ethanesulfonic acid (PIPES), 2-(N-morpholino)-2-hydroxypropanesulfonic acid (MOPSO), N,N-bis-(hydroxyethyl)-2-aminoethanesulfonic acid (BES), 3-(N-morpholino)-propanesulfonic acid (MOPS), N-tris-(hydroxymethyl)-2-ethanesulfonic acid (TES), N-2-hydroxyethyl-piperazine-N-2-ethanesulfonic acid (
  • the concentration of the buffer or buffers included in gels that are contained in gel cassettes as described herein can be from about 10 mM to about 1.5 M. In certain embodiments the concentration can be between about 10 mM and about 1 M. In certain embodiments the concentration can be between about 20 mM and about 500 mM, and in other embodiments the concentration is between about 50 mM and about 300 mM. In certain embodiments the concentration can be between about 10 mM and about 200 mM, and in other embodiments the concentration is between about 10 mM and about 500 mM. In certain embodiments the concentration can be between about 50 mM and about 200 mM, and in other embodiments the concentration is between about 50 mM and about 500 mM.
  • the concentration can be between about 5 mM and about 200 mM, and in other embodiments the concentration is between about 5 mM and about 500 mM. In certain embodiments the concentration can be between about 5 mM and about 1 M. In certain embodiments, the concentration of the buffer or buffers included in gels that are contained in gel cassettes as described herein can be from 10 mM to 1.5 M. In certain embodiments the concentration can be between 10 mM and 1 M. In certain embodiments the concentration can be between 20 mM and 500 mM, and in other embodiments the concentration is between 50 mM and 300 mM.
  • the concentration can be between 10 mM and 200 mM, and in other embodiments the concentration is between 10 mM and 500 mM. In certain embodiments the concentration can be between 50 mM and 200 mM, and in other embodiments the concentration is between 50 mM and 500 mM. In certain embodiments the concentration can be between 5 mM and 200 mM, and in other embodiments the concentration is between 5 mM and 500 mM. In certain embodiments the concentration can be between 5 mM and 1 M.
  • the electrophoresis gels described herein can be used to separate components of a sample including, but not limited to, separating biomolecules.
  • the methods of separating samples components on such electrophoresis gels includes, but are not limited to, applying one or more samples to an electrophoresis gel and electrophoretically separating the sample components on the electrophoresis gel.
  • such methods include, but are not limited to, applying one or more samples comprising one or more biomolecules to an electrophoresis gel that comprises a separating gel, and electrophoretically separating one or more biomolecules or biomolecular complexes on the separating gel.
  • such methods include, but are not limited to, applying one or more samples comprising one or more biomolecules to an electrophoresis gel that comprises a separating gel comprising linear polyacrylamide, and electrophoretically separating one or more biomolecules or biomolecular complexes on the separating gel.
  • such methods include, but are not limited to, applying one or more samples comprising one or more biomolecules to an electrophoresis gel that comprises a stacking gel portion and a separating gel portion, and electrophoretically separating one or more biomolecules or biomolecular complexes on the separating gel.
  • such methods include, but are not limited to, applying one or more samples comprising one or more biomolecules to an electrophoresis gel that comprises a stacking gel portion that comprises linear polyacrylamide and a separating gel portion, and electrophoretically separating one or more biomolecules or biomolecular complexes on the separating gel.
  • such methods include, but are not limited to, applying one or more samples comprising one or more biomolecules to an electrophoresis gel that comprises a stacking gel portion and a separating gel portion, wherein both the stacking gel and the separating gel comprise linear polyacrylamide; and electrophoretically separating one or more biomolecules or biomolecular complexes on the separating gel.
  • the stacking gel comprises linear polyacrylamide
  • the presence of skirting bands on the separating gel is reduced.
  • the separating gel comprises linear polyacrylamide
  • the presence of skirting bands on the separating gel is reduced.
  • the stacking gel and the separating gel comprise linear polyacrylamide
  • the presence of skirting bands on the separating gel is reduced.
  • reduced is meant the appearance, intensity, or width of skirting bands is less on electrophoresis gels having linear polyacrylamide than in electrophoresis gels without linear polyacrylamide run under the same conditions and having the same composition (except having linear polyacrylamide).
  • the gels used in such methods can be any electrophoresis gel described herein.
  • the gels are polyacrylamide gels.
  • the gels are agarose gels, while in other embodiments the gels comprise both acrylamide and agarose.
  • the gels used in such methods can be denaturing gels as disclosed herein, including, but not limited to, SDS polyacrylamide gels.
  • the gels used in such methods can be non-denaturing gels as disclosed herein, including, but not limited to, blue native (BN) gels.
  • the separating gel used in such methods can have any suitable composition.
  • the separating gel used in such methods includes linear polyacrylamide. In other embodiments, the separating gel used in such methods does not include linear polyacrylamide.
  • the separating gel used in such methods comprises polyacrylamide, while in other embodiments the separating gel used in such methods comprises both polyacrylamide and linear polyacrylamide. In some embodiments, the separating gel used in such methods is a gradient gel. In certain embodiments, the electrophoresis gels used in such methods are multiwell gels, in which two or more samples, one or more samples, or multiple loadings of the same sample are electrophoresed simultaneously. In certain embodiments, the electrophoresis gels used in such methods are multiwell gels, in which one or more molecular weight standards along with two or more samples, one or more samples, or multiple loadings of the same sample are electrophoresed simultaneously.
  • Native or non-denaturing gels used in the methods disclosed herein are run without denaturing agents such as, for example, protein-denaturing detergents or chaotropes in the gel or in the running buffer(s).
  • the native gels used in the methods disclosed herein include, but are not limited to, blue native (BN) gels.
  • BN blue native
  • the use of blue native gels, in which the cathode buffer, the protein sample buffer, or both, contain Coomassie G-250 has been described in Schagger H and von Jagow G (1991) “Blue native electrophoresis for isolation of membrane protein complexes in enzymatically active form” Anal Biochem.
  • biomolecules separated on an electrophoresis gel described herein and using the methods described herein can be any biomolecule, including, but not limited to, proteins, nucleic acids, polysaccharides, lipids, and other macromolecules.
  • the biomolecules separated on an electrophoresis gel described herein and using the methods described herein are proteins, nucleic acids, or biomolecular complexes that include proteins or nucleic acids.
  • biomolecular complexes can be any combination of associated proteins, peptides, nucleic acids, and polysaccharides.
  • the biomolecules or complexes separated on an electrophoresis gel that comprises linear polyacrylamide in the stacking portion of the gel are proteins or molecular complexes that include proteins.
  • the electrophoresis gel has two or more wells for electrophoresis of at least two standards or at least one sample and at least one molecular weight standard.
  • the biomolecules or complexes separated on an electrophoresis gel, that is contained in a gel cassette having a consistent internal gap as disclosed herein are proteins or molecular complexes that include proteins.
  • the one or more samples, or two or more replicates of the same sample, applied to the electrophoresis gel can be any samples that include biomolecules, and can be environmental samples, tissue samples, cell extracts or fractions, etc.
  • the samples can be crude samples such as lysates, fractionated samples, or partially or substantially processed or purified samples.
  • a sample Prior to loading on an electrophoresis gel, a sample can be treated with solubilizers, reducing agents, denaturing agents or treatments, detergents, chaotropic agent, or other sample preparation agents.
  • solubilizers such as, for example, non-denaturing detergents.
  • the methods, gels and gel cassettes described herein can be used to electrophoretically separate biomolecules and/or biomolecular complexes.
  • general electrophoresis methods and parameters such as sample loading and electrophoresis run time are known in the art and are well within the capabilities of a killed artisan.
  • apparatuses designed to hold gel assemblies, gel cassettes and running buffers, during electrophoresis are well known in the art and widely available commercially, including but not limited to, the SureLockTM mini-cell electrophoresis apparatus (Invitrogen Corp, Carlsbad, Calif.). Such apparatuses can be used with the methods, gels and gel cassettes described herein.
  • electrophoresis conditions can be determined by a practitioner guided by protocols known in the art.
  • the electrophoretic separations disclosed herein can be achieved using constant voltage, pulsed voltage, step-gradient voltage, constant current, pulsed current, step-gradient current, constant power, step-gradient power or pulsed power.
  • the applied electric field (V/cm) in the methods disclosed herein can be constant or pulsed. It is understood that the magnitude of the applied voltage, applied current or applied power to achieve the electric fields ranges provided below will vary depending on the dimensions of the electrophoresis cassette and buffer conductivity.
  • the applied voltage can range from 5V to 2000V, and in certain embodiments the applied voltage can range from 5V to 1000V, 5V to 500V, 5V to 250V, or 5V to 100V. In other embodiments, the applied voltage can range from about 10 to about 1,000 V, from about 25 to about 750 V, or from about 40 to about 300 V.
  • the applied current can range from 5 mA to 400 mA, and in certain embodiments the applied current can range from 5 mA to 200 mA, 5 mA to 100 mA, 5 mA to 50 mA, or 5 mA to 25 mA. In one embodiment the applied current can be 15 mA.
  • the applied current can range from 5 mA to 400 mA, and in certain embodiments the applied power can range from 25 mW to 400 W, 25 mW to 100 W, 25 mW to 50 W, or 25 mW to 25 W. In one embodiment the applied power can be 4.5 W.
  • the polarity of the applied voltage (constant or pulsed) can be positive or negative, and the polarity of the applied current (constant or pulsed) can be positive or negative.
  • the magnitude of the constant electric field applied is between 1 V/cm and 100 V/cm. In certain embodiments the magnitude of the constant electric field applied is between 1 V/cm and 50 V/cm. In certain embodiments the magnitude of the constant electric field applied is between 1 V/cm and 25 V/cm. In certain embodiments the magnitude of the constant electric field applied is between 1 V/cm and 15 V/cm. In certain embodiments the magnitude of the constant electric field applied is between 1 V/cm and 10 V/cm.
  • the step profile can be a single step, two steps, or greater than two steps.
  • the step voltage is applied to a constant baseline electric field, established by applying a baseline voltage, and the magnitude of this baseline electric field is from 0 V/cm to 100 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 50 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 25 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 10 V/cm. In certain embodiments the magnitude of the baseline voltage is from 0V to 1000V, while in other embodiments the magnitude of the baseline voltage is from 0V to 500V.
  • the magnitude of the baseline voltage is from 0V to 200V, while in other embodiments the magnitude of the baseline voltage is from 0V to 100V. In certain embodiments the magnitude of the baseline voltage is from 0V to 50V, while in other embodiments the magnitude of the baseline voltage is from 0V to 10V.
  • the magnitude of the voltage step applied to the baseline voltage can be from 10V to 2000V, while in other embodiments the voltage step is from 10V to 1000V. In certain embodiments the magnitude of the voltage step applied to the baseline voltage is from 10V to 500V, while in other embodiments the magnitude of the voltage step is from 10V to 200V.
  • the magnitude of the voltage step applied to the baseline voltage is from 10V to 100V, while in other embodiments the magnitude of the voltage step is from 10V to 50V.
  • the magnitude of each step can be symmetric (i.e. the same), or the magnitude of each step can be asymmetric (i.e. different).
  • a two step symmetric step-gradient voltage profile is a first 50V step applied to a 0V baseline, followed by another 50V step.
  • a two step asymmetric step-gradient voltage profile is a first 50V step applied to a 0V baseline, followed by a 450V step.
  • a two step asymmetric step-gradient voltage profile is a first 50V step applied to a 0V baseline, followed by a 500V step. In other embodiments a two step asymmetric step-gradient voltage profile is a first 75V step applied to a 0V baseline, followed by a 175V step. In other embodiments a two step asymmetric step-gradient voltage profile is a first 75V step applied to a 0V baseline, followed by a 250V step.
  • a single step, or independently each step of a multiple step-gradient can be run for from about 5 minutes to about 500 minutes, depending on the magnitude of the applied voltages. In certain embodiments the step run times can be from about 5 minutes to about 150 minutes.
  • the step run times can be from about 5 minutes to about 100 minutes. In certain embodiments the step run times can be from about 5 minutes to about 60 minutes. In certain embodiments the step run times can be from about 5 minutes to about 30 minutes. In certain embodiments for a two step asymmetric step-gradient voltage profile the first step is applied for 15 minutes and the second step is applied for 45 minutes. In certain embodiments for a two step asymmetric step-gradient voltage profile the first step is applied for 15 minutes and the second step is applied for 50 minutes. In certain embodiments for a two step asymmetric step-gradient voltage profile the first step is applied for 15 minutes and the second step is applied for 55 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 60 minutes. In certain embodiments for a two step asymmetric step-gradient voltage profile the first step is applied for 15 minutes and the second step is applied for 65 minutes.
  • the step profile can be a single step, two steps, or greater than two steps.
  • the step current is applied to a constant baseline electric field, established by applying a baseline current, and the magnitude of this baseline electric field is from 0 V/cm to 100 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 50 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 25 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 10 V/cm.
  • the magnitude of the baseline current is from 0 mA to 10 mA, while in other embodiments the magnitude of the baseline current is from 0 mA to 5 mA. In certain embodiments the magnitude of the baseline current is from 0 mA to 2 mA, while in other embodiments the magnitude of the baseline current is from 0 mA to 1 mA. In certain embodiments the magnitude of the baseline current is from 0 mA to 0.5 mA.
  • the magnitude of the current step applied to a baseline current can be from 0.5 mA to 100 mA, while in other embodiments the current step is from 0.5 mA to 50 mA.
  • the magnitude of the current step applied to a baseline current is from 0.5 mA to 25 mA, while in other embodiments the magnitude of the current step is from 0.5 mA to 10 mA. In certain embodiments the magnitude of the current step applied to the baseline current is from 0.5 mA to 5 mA, while in other embodiments the magnitude of the current step is from 0.5 mA to 2 mA.
  • the magnitude of each step can be symmetric (i.e. the same), or the magnitude of each step can be asymmetric (i.e. different).
  • a two step symmetric step-current current profile is a first 7 mA step applied to a 0 mA baseline, followed by another 7 mA step.
  • a two step asymmetric step-gradient current profile is a first 1 mA step applied to a 0 mA baseline, followed by a 14 mA step.
  • a single step, or independently each step of a multiple step-gradient can be run for from about 5 minutes to about 500 minutes, depending on the magnitude of the applied current.
  • the step run times can be from about 5 minutes to about 150 minutes.
  • the step run times can be from about 5 minutes to about 100 minutes.
  • the step run times can be from about 5 minutes to about 60 minutes.
  • the step run times can be from about 5 minutes to about 30 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 45 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 50 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 55 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 60 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 65 minutes.
  • the step profile can be a single step, two steps, or greater than two steps.
  • the step current is applied to a constant baseline electric field, established by applying a baseline power level, and the magnitude of this baseline electric field is from 0 V/cm to 100 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 50 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 25 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 10 V/cm.
  • the magnitude of the baseline power is from 0 W to 10 W, while in other embodiments the magnitude of the baseline power is from 0 W to 5 W. In certain embodiments the magnitude of the baseline power is from 0 W to 2 W, while in other embodiments the magnitude of the baseline current is from 0 W to 1 W. In certain embodiments the magnitude of the baseline power is from 0 W to 0.5 W.
  • the magnitude of the power step applied to a baseline can be from 0.5 W to 10 W, while in other embodiments the power step is from 0.5 W to 5 W. In certain embodiments the magnitude of the power step applied to a baseline is from 0.5 W to 2 W, while in other embodiments the magnitude of the power step is from 0.5 mA to 1 W.
  • the magnitude of each step can be symmetric (i.e. the same), or the magnitude of each step can be asymmetric (i.e. different).
  • a two step symmetric step-power profile is a first 1.5 W step applied to a 0 W baseline, followed by another 1.5 W step.
  • a two step asymmetric step-gradient power profile is a first 0.5 W step applied to a 0 mA baseline t, followed by a 3 W step.
  • a single step, or independently each step of a multiple step-gradient can be run for from about 5 minutes to about 500 minutes, depending on the magnitude of the applied current. In certain embodiments the step run times can be from about 5 minutes to about 150 minutes.
  • the step run times can be from about 5 minutes to about 100 minutes. In certain embodiments the step run times can be from about 5 minutes to about 60 minutes. In certain embodiments the step run times can be from about 5 minutes to about 30 minutes. In certain embodiments for a two step asymmetric step-gradient power profile the first step is applied for 15 minutes and the second step is applied for 45 minutes. In certain embodiments for a two step asymmetric step-gradient power profile the first step is applied for 15 minutes and the second step is applied for 50 minutes. In certain embodiments for a two step asymmetric step-gradient power profile the first step is applied for 15 minutes and the second step is applied for 55 minutes.
  • the first step is applied for 15 minutes and the second step is applied for 60 minutes. In certain embodiments for a two step asymmetric step-gradient power profile the first step is applied for 15 minutes and the second step is applied for 65 minutes.
  • the profile of the pulsed electric field can be a square wave, triangular wave or sine wave, and such profiles can be symmetric or asymmetric.
  • the pulsed electric field is applied to a constant baseline electric field and the magnitude of this baseline electric field is from 0 V/cm to 100 V/cm. In certain embodiments the magnitude of this baseline electric field is from 0 V/cm to 50 V/cm. the magnitude of this baseline electric field is from 0 V/cm to 25 V/cm. the magnitude of this baseline electric field is from 0 V/cm to 10 V/cm. In certain embodiments the magnitude of the pulsed electric field applied in addition to the baseline electric field is between 1 V/cm and 100 V/cm.
  • the magnitude of the pulsed electric field applied in addition to the baseline electric field is between 1 V/cm and 50 V/cm. In certain embodiments the magnitude of the pulsed electric field applied in addition to the baseline electric field is between 1 V/cm and 25 V/cm. In certain embodiments the magnitude of the pulsed electric field applied in addition to the baseline electric field is between 1 V/cm and 10 V/cm.
  • the time the pulsed electric field is applied in addition to the baseline electric field (ON) is the same as the time that the pulsed electric field is not applied (OFF).
  • the ON and OFF times are between 1 ms and 60 seconds.
  • the ON time is independently between 1 ms and 60 seconds, and the OFF time is independently between 1 ms and 60 seconds.
  • the voltage ramp rate (V/s) up to the maximum electric field applied is the same as the time that the voltage ramp rate (V/s) down to the baseline electric field applied.
  • the voltage ramp up and the voltage ramp down are between 10 mV/s and 100 V/s.
  • the voltage ramp rate (V/s) up to the maximum electric field applied is not the same as the time that the voltage ramp rate (V/s) down to the baseline electric field applied.
  • the voltage ramp up is independently between 10 mV/s and 100 V/s and the voltage ramp down is independently between 10 mV/s and 100 V/s.
  • the period and frequency are constant, and the minimum electric field of the sine wave is the same as the baseline electric field applied.
  • the period and frequency are modulated, and the minimum electric field of the sine wave is the same as the baseline electric field applied.
  • the electrophoresis runs of the methods disclosed herein can be performed at room temperature, ambient temperature, or at a higher or lower temperature. By way of example only it may be desirable for users to run their gels in a cold room with pre-chilled buffers or at room temperature with pre-chilled buffers. In certain embodiments the electrophoretic runs are performed at lower temperatures include, but are not limited to, temperatures from about 1° C. to about 10° C. For low temperature runs, it can in some cases be preferable to run the gel at a higher voltage at the end of the run.
  • the methods disclosed herein also include detecting one or more bands on the electrophoresed gel that comprises a biomolecule.
  • One or more biomolecules or biomolecular complexes can be stained or labeled before, during, or after electrophoresis using techniques that are well known in the art.
  • the bands can be observed using light boxes, scanners, or by the naked eye without special equipment.
  • the migration distance of one or more bands of a sample can be determined.
  • molecular weight markers can be electrophoresed on the same gel that the sample is electrophoresed on, by applying a set of one or more molecular weight markers on the gel to electrophoresis alongside the one or more samples.
  • the molecular weight of one or more bands from the sample can be estimated or calculated by comparing the migration of the band with that of one or more bands of the molecular weight markers.
  • the one or more bands can represent, for example, proteins, protein complexes, nucleic acids, or nucleic acid-protein complexes.
  • Visualization of the sample bands in the electrophoresis gel can be achieved by illuminating the electrophoresis gel with light of appropriate wavelength(s) to allow observation of dyes, stains or other indicators associated with the sample bands.
  • the dyes, stains or other indicators are added to the sample prior to loading in the electrophoresis gel.
  • the dyes, stains or other indicators are added to the loading well or loading wells prior to addition of the sample to loading wells of the electrophoresis gel, while in other embodiments the dyes, stains or other indicators are added to the loading well or loading wells after to addition of the sample loading wells of the electrophoresis gel.
  • the dyes, stains or other indicators are added to the electrophoresis gel whereby they become associated with the sample components during electrophoretic migration.
  • the dyes, stains or other indicators are covalently attached to the sample components.
  • the systems, dyes and stains used for visualization can be fluorescent or non-fluorescent.
  • Non-limiting examples of the systems, dyes and stains used in the methods disclosed herein are silver staining or Coumassie Blue stain.
  • the light used for visualization can be monochromatic or polychromatic.
  • polychromatic light can be white light, UV light or infra-red light
  • monochromatic light can be achieved using lasers or Light Emitting Diodes (LED's), or by specific spectral filtering of sources such as white light, UV light or infra-red light.
  • LED's Light Emitting Diodes
  • specific spectral filtering of sources such as white light, UV light or infra-red light. It would be understood that the desired wavelength of such monochromatic light depends on the specific spectral characteristics of the dye or stain used, and the skilled artisan will know the methods to obtain such monochromatic light.
  • visualization is performed in a stand alone “light box” in which the electrophoresis cassette is placed during or after electrophoretic separation of the sample.
  • the electrophoresis cassette can be illuminated from above or below.
  • Monitoring can be achieved using a CCD camera or a video camera, or by direct observation of the user.
  • an electrophoresis/monitoring apparatus is used in which the monitoring means (CCD camera or a video camera, or by direct observation) and the means for application of the electric field or fields are combined into one apparatus.
  • FIG. 1 compares electrophoretic separation of proteins and protein complexes on a gel that includes linear acrylamide in the stacker and a gel that does not include linear acrylamide in the stacker.
  • the electrophoresis gels used were 3-12% Blue Native gradient gels without linear acrylamide in the stacking gel (top gel) or with 0.05% linear acrylamide in the stacking gel (bottom gel). Gels were run for 90 minutes at 150V using 50 mM BisTris, 50 mM Tricine running buffer (0.02% Coomassie G-250 in cathode buffer only) and stained with colloidal Coomassie.
  • Lanes 1, 5, and 10 were loaded with 5 uL of unstained native standards (Invitrogen, Carlsbad, Calif.); Lanes 2, 4, 7, and 9 were loaded with 4 uL of bovine mitochondrial extract solubilized in 1% dodecylmaltoside. Arrows indicate skirting artifacts (present in the top gel only). The presence of linear acrylamide in the stacking gel reduced the skirting effects as observed in the electrophoresis gel without the linear acrylamide in the stacking gel.
  • Bovine mitochondria were isolated as described previously (Rice, J. E. & Lindsay, J. G. (2002) “Subcellular fractionation of mitochondria” in Subcellular Fractionation: A Practical Approach, Edited by Graham, J. M. & Rickwood D., Oxford University Press, New York, pp. 107-115). Isolated mitochondria in TESS buffer (250 mM sucrose, 1 mM succinate, 0.2 mM EDTA, 10 mM Tris pH 7.8 at 4° C.) were stored at ⁇ 80° C. in 250 uL aliquots.
  • 5% G-250 sample additive that included 5% Coomassie G-250 and 20.1% NDSB201 was added to the sample so that the final concentration of the G-250 was one-fourth that of the detergent concentration in the sample.
  • the 5% G-250 sample additive was added to the samples while they were on ice and just before loading onto the gel. For samples that did not contain detergent, no 5% G-250 sample additive was used.
  • Running buffers were prepared as shown in the following table. TABLE 1 Running Buffers for Native Gel Electrophoresis Dark Blue Light Blue Anode Cathode Cathode Component Buffer Buffer Buffer Running Buffer (20 ⁇ ) 30 mL 10 mL 10 mL Cathode Additive 0 mL 10 mL 1 mL (20 ⁇ ) Ultrapure water 570 mL 180 mL 189 mL 20 ⁇ Running Buffer was 1 M BisTris, 1 M Tricine, pH 7.5-7.65. Cathode additive was 0.4% Coomassie G-250 in water.
  • cathode buffer used depended on the application performed. Table 2 details the various cathode buffers used.
  • the dark blue cathode buffer contained 0.02% G-250 and was used in native electrophoresis runs where samples that contain detergent were used, as shown in FIG. 3 .
  • Electrophoresis was performed at 150V.
  • the current limit was set at 15 mA per gel.
  • the run times for 3-12% gels were typically 90-100 minutes and the run times for 4-16% gels were typically 105-120 minutes when running at room temperature with room temperature buffers.
  • Coomassie G-250 Long Protocol high sensitivity staining The gels were placed in 100 mL fix solution (40% methanol, 10% acetic acid) and microwaved 45 seconds and shake for 15-30 minutes. The fix step was repeated once for the 3-12% gels. The fix solution was decanted, and 100 mL stain solution was added from the Colloidal Blue Staining Kit (Invitrogen Corp., Carlsbad, Calif.; 55 mL water, 20 mL methanol, 20 mL stainer A, 5 mL stainer B) and the gels were incubated overnight with shaking. Stain solution was decanted, and 100 mL 8% acetic acid was added.
  • the gels were incubated with shaking for 5 minutes (this removes any G-250 precipitated on the surface of the gel or staining vessel).
  • the acetic acid was then decanted, and 100 mL distilled water was added and the gels were shaken until desired background level was obtained.
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