CN100398655C - Transglycosyl alpha-galactoglucosidezyme gene - Google Patents
Transglycosyl alpha-galactoglucosidezyme gene Download PDFInfo
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Abstract
The present invention discloses a trans-glycosyl alpha-galactoside enzyme gene obtained through a process that bifidobacterium breve genomic DNA obtains a high-conservation DNA fragment through PCR amplification, and then the high-conservation DNA fragment is treated by southern hybridization. The full length of the nucleotide sequence of the trans-glycosyl alpha-galactoside enzyme gene is 2226 basic groups, and 741 amino acids are coded. The recombinant enzyme of the gene expression is characterized in that the enzyme is a double-subunit protein, the molecular weight of a polymer is about 160kD, and the molecular weight of single subunit is about 80kD; the K<m> of the enzyme for p-nitrophenol alpha-D-galactoside is 0.17 mmol/L, and the V<max> is 4.43 mumol/(L. min); the optimal reaction temperature of the enzyme is 37 DEG C, and the optimal reaction pH is 5.5 to 6.0; the enzyme has trans-glycosyl activity in a melibiose or gossypose hydrolyzing reaction system and generates trans-glycosyl products during reaction; the receptor substrate of the enzyme has wide specificity, and can be used for synthesizing various alpha-galactosyl oligosaccharide and alpha-galactoside compounds. The enzyme gene obtaining process can be used for gene modification to obtain alpha-galactoside synthetase so as to fundamentally enhance the synthesis efficiency of the alpha-galactosyl oligosaccharide and alpha-galactoside compounds.
Description
Invention field
The present invention relates to a kind of alpha-galactosidase gene, relate in particular to a kind of application of changeing glycosyl alpha-galactosidase gene and described commentaries on classics glycosyl alpha-galactosidase gene thereof.
Background of invention
Oligosaccharides is one of key element of mammalian cell surface glycoprotein and glycolipid and microbe-derived physiologically active substance, has powerful functions such as bioinformation transmission.Thereby oligosaccharides is used for the analysis of drug modification, oligosaccharide structure and the development of oligosaccharides synthetic technology has just caused people's very big concern.Though oligosaccharides is generally acknowledged to have sizable potential as a kind of therapy by scientist, its important effect is not so far still embodied fully.One of reason of its slower development is a very difficulty of the synthetic oligosaccharides that is sufficient to clinical usage quantity.It is loaded down with trivial details that a plurality of hydroxyls that react make the chemical method synthesis step of specificity glycosidic link on the saccharide compound, is not suitable for scale operation.Enzyme process catalysis synthesis of oligose relies on its simple steps, special regioselectivity and stereoselectivity, is becoming oligosaccharides and glycoconjugate synthetic main flow.
There are two fermentoids to be used for the synthetic of catalysis glycosidic link: glycosyltransferase and Glycosylase.Glycosyltransferase has been used to produce some oligosaccharides, but enzyme difficult obtains and nucleosides substrate expensive limited its widespread use.And catalytic glucosides of Glycosylase and oligose building-up reactions approach are simple, do not need other cofactor, and substrate is generally low-cost monose and disaccharide.Enzyme more easily obtains, stable in properties.But, in the building-up reactions that Glycosylase carried out, change newly-generated glucosides of glycosyl and oligosaccharides also can be again by enzyme as substrate hydrolysis, reaction is in hydrolysis and synthetic dynamic balance state, the output that causes changeing the glycosyl product is generally lower.In order to break this balance, scientist has carried out unremitting effort.Utilize the thermodynamics and the principle of dynamics of enzyme reaction to strengthen the output (10-40%) that concentration of substrate, raising temperature of reaction etc. can improve the glucosides product to a certain extent; (80-90% v/v) or two-phase reaction system, reduces the concentration and the activity of water, impels molecular balance to carry out to glucosides synthetic direction, has further improved the output (40-60%) of glucosides product to adopt high levels of organic solvents.But in the reaction system effective concentration of water keep and low water surrounding under the high reactivity of water all limited the final application of output and these methods of product to a certain extent.
In recent years, the development and progress of Protocols in Molecular Biology has promoted the research in Glycosylase synthesis of oligose field greatly.1998, scientist carries out molecular modification to Glycosylase, replaces the nucleophilic catalysis amino-acid residue at the enzyme catalysis center with non-nucleophilic amino-acid residue, has produced a class novel active enzyme, catalytic synthesis, so called after glucosides synthetic enzyme (Glycosynthases).The appearance of glucosides synthetic enzyme has thoroughly solved the problem that the product one's water breaks is separated, and has fundamentally improved the commentaries on classics glycosyl efficient (changeing glycosyl efficient can reach more than 90%) of Glycosylase.Up to the present, Fa Zhan glucosides synthetic enzyme has 13 kinds in the world, derive from 11 kinds of different microorganisms and plant, obtained by beta-glucosidase, beta-glucan glycosides enzyme, beta-galactosidase enzymes, beta-Mannosidase, alpha-glucosidase, beta-mannase glycosides enzyme etc. transformations respectively, the research of alpha galactosides synthetic enzyme yet there are no report.The focus of the synthetic area research of oligosaccharides is exactly an efficient commentaries on classics glycosyl Glycosylase of seeking different sources at present, and obtains the enzyme gene, obtains the glucosides synthetic enzyme so that carry out genetic modification on this basis.
Alpha-galactosidase (EC3.2.1.22), it is the important glycoside hydrolase of a class, discovery is all arranged, but specificity hydrolysis alpha galactosides key can also be transferred to α-galactosyl on the different hydroxy kind derivatives in people, animal, plant and microbe.Its hydrolytic activity is studied morely, is widely used in processing agricultural-food, people B → O blood group transformation, removes heterologous antigen and treatment heredopathia fabry disease etc.; It changes the galactosyl activity and was just reported by Japanese scientist up to 1988, the alpha-galactosidase of only having reported at present ten kinds of sources in the world has the glycosyl of commentaries on classics activity, wherein, there are the alpha-galactosidase and the melibiose in four kinds of sources to carry out the reaction of commentaries on classics glycosyl and identified product structure, are Gal α (1 → 6) Gal α (1 → 6) Glc.In order to obtain the synthetic alpha galactosides of bonding of new enzyme process, need to seek new commentaries on classics glycosyl alpha-galactosidase.In addition, there are differences because the alpha-galactosidase of different sources changes the glycosyl acceptor specificity of galactosyl reaction, the commentaries on classics glycosyl alpha-galactosidase of therefore seeking different sources has significance to the synthetic different α of enzyme process-galactosyl oligosaccharides and glycoconjugate.
It should be noted that changes the mechanism of action that the glycosyl alpha-galactosidase is followed the retention of configuration Glycosylase, and the catalyzed reversible reaction causes the product productive rate to be subjected to certain limitation, therefore has limitation in extensive the synthesizing of sugar.This just needs further research enzyme gene, for molecular modification provides the basis, to obtain the alpha galactosides synthetic enzyme, fundamentally improves combined coefficient.Only have five kinds to change glycosyl alpha-galactosidase gene report at present in the world, and the research of relevant alpha galactosides synthetic enzyme report is still blank.So the commentaries on classics glycosyl alpha-galactosidase gene of research different sources can provide new enzyme source for the molecular modification of Glycosylase, efficient α-galactosyl oligosaccharides and the glycoconjugate that synthesizes different of bondings there is significance.
By retrieval, there is not bifidobacterium breve (Bifidobacterium breve) to change the report of glycosyl alpha-galactosidase gene at present in the world.
Summary of the invention
The purpose of this invention is to provide a kind of new commentaries on classics glycosyl alpha-galactosidase gene,, and fill up the blank that domestic and international bifidobacterium breve is changeed the research of glycosyl alpha-galactosidase gene for the acquisition of alpha galactosides synthetic enzyme provides new enzyme source.
The commentaries on classics glycosyl alpha-galactosidase gene that the present invention relates to derives from bifidobacterium breve (Bifidobacterium breve) ATCC 15700, and feature is as follows:
(1) has nucleotide sequence shown in SEQ ID No.1, total length 2226 bases;
(2), have and be different from nucleotide sequence shown in the SEQ ID No.1 but the aminoacid sequence identical nucleotide sequence coded with SEQID No.1 because the degeneracy of genetic code;
(3) 741 amino acid of this genes encoding, sequence is shown in SEQ ID No.1.
The application of above-mentioned commentaries on classics glycosyl alpha-galactosidase gene, its method be, with this gene clone to the pET-22b plasmid expression vector, transformed into escherichia coli BL21 (DE3), abduction delivering reorganization alpha-galactosidase, feature is as follows:
(1) said gene is two protein subunits at the recombinase of expression in escherichia coli, and the polymer molecule amount is about 160kD, and single molecular weight subunit is about 80kD; Enzyme is to p-NP α-D-galactoside (p-nitrophenyl-α-D-galactopyranoside, K pNPG)
mBe 0.17mmol/L, V
MaxBe 4.43 μ mol/ (Lmin), to the K of melibiose and raffinose
mValue is respectively 0.66mmol/L, 2.20mmol/L, V
MaxBe respectively 0.58 μ mol/ (Lmin), 0.65 μ mol/ (Lmin); Enzyme is 37 ℃～40 ℃ to the temperature of the suitable reaction of pNPG, and the pH of suitable reaction is 5.5～6.5; Enzyme is when preserving for 4 ℃, and stable at least preservation is 24 hours in pH 5.5～9.5 scopes; Hg
2+, Cu
2+, Ag
+The activity of strongly inhibited enzyme, Co
2+, Mg
2+, Ca
2+, Mn
2+, Zn
2+, DTT, EDTA do not have restraining effect to the activity of enzyme;
(2) said gene has the glycosyl of commentaries on classics activity at the recombinase of expression in escherichia coli in the reaction system of hydrolysis melibiose or raffinose, there is the glycosyl of commentaries on classics product to generate in the reaction, wherein, the main commentaries on classics glycosyl product structure of enzyme in the melibiose reaction system is Gal α (1 → 4) Gal α (1 → 6) Glc, in the report of existing alpha-galactosidase, the of bonding that galactosyl is gone to melibiose all is α (1 → a 6) key in the world; When being glycosyl donor with pNPG, galactosyl can be transferred on multiple sugar, the alkylol cpd, as semi-lactosi, wood sugar, glucose, fructose, seminose, sorbose, rhamnosyl, trehalose, sucrose, lactose, cellobiose, sorbyl alcohol, inositol, N.F,USP MANNITOL etc.; Its factory is general is subjected to sugared body substrate specificity, can be in order to synthetic multiple α-galactosyl oligosaccharides and glycoconjugate.
Wherein, above-mentioned recombinase is 37 ℃ to the optimal reactive temperature of pNPG.
Wherein, above-mentioned recombinase is 5.5～6.0 to the optimal reaction pH of pNPG.
In the buffering range of above-mentioned pH5.5～9.5, pH5.5～8 0 scopes are used dipotassium hydrogen phosphate-potassium phosphate buffer, and pH8.0～10.0 scopes are used boric acid-sodium hydrate buffer solution.
In the application of above-mentioned commentaries on classics glycosyl alpha-galactosidase gene, with this gene clone to the pET-22b plasmid expression vector, not only can obtain a large amount of recombinases to solve the problem that bifidus bacillus is difficult to cultivate, also can be used for genetic modification simultaneously, promptly the enzyme gene is carried out rite-directed mutagenesis, replace the nucleophilic catalysis amino-acid residue at the enzyme catalysis center with non-nucleophilic amino-acid residue, to obtain the alpha galactosides synthetic enzyme, thoroughly remove hydrolysis reaction, fundamentally improve the combined coefficient of α-galactosyl oligosaccharides and glycoconjugate.
Description of drawings
The recombinase that Fig. 1 expresses for alpha-galactosidase gene of the present invention is the commentaries on classics glycosyl reaction of substrate with the melibiose.
Wherein: Lane 1, melibiose and the reaction of inactivator liquid; Lane 2, melibiose and pure enzyme reaction.
The recombinase that Fig. 2 expresses for alpha-galactosidase gene of the present invention is the commentaries on classics glycosyl reaction of substrate with the raffinose.
Wherein: Lane 1, raffinose and the reaction of inactivator liquid; Lane 2, raffinose and pure enzyme reaction.
Embodiment
The extraction of embodiment 1 bifidobacterium breve (Bifidobacterium breve) ATCC 15700 chromosomal DNAs
ATCC 15700 is inoculated in the 5mL MRS substratum with bifidobacterium breve (Bifidobacterium breve), 37 ℃ of anaerobism were cultivated 24 hours, get the 1.5ml culture, 12,000 rev/min centrifugal 2 minutes, gained precipitation is suspended from the TE damping fluid of 565 μ L, adds N,O-Diacetylmuramidase to final concentration 10mg/ml, 37 ℃ of incubations 30 minutes; Add the sodium lauryl sulphate (SDS) of 30 μ L10% (mass volume ratio) and the Proteinase K of 5 μ L 20mg/mL, mixing was in 37 ℃ of incubations 1 hour; Add isopyknic phenol/chloroform/primary isoamyl alcohol (25: 24: 1, v/v/v), mixing; 12,000 rev/mins centrifugal 5 minutes, supernatant liquor is changed in the new pipe, add isopyknic phenol/chloroform/primary isoamyl alcohol again, mixing; 12,000 rev/mins centrifugal 5 minutes, supernatant is changed in the new pipe, add 2 times of volume dehydrated alcohols, mixing precipitates up to DNA gently; 12,000 rev/mins centrifugal 5 minutes, DNA precipitation is with 70% washing with alcohol 2 times; Vacuum-drying 10 minutes heavily is dissolved in the TE damping fluid of 50 μ L.
Above-mentioned MRS culture medium prescription is: peptone 1g/L; K
2HPO
40.2g/L; Triammonium citrate 0.2g/L; Beef extract 1g/L; NaAc3H
2O 0.05g/L; MgSO
47 H
2O 0.02g/L; MnSO
44H
2O 0.005g/L; Yeast extract 0.5g/L; Glucose 2g/L; Tween 80 0.1g/L; PH 6.0～6.6, sterilize 30 minutes for 115 ℃;
The TE buffer formulation is as follows: the Tutofusin tris of 10mmol/L (Tris), and the disodium ethylene diamine tetraacetate of 1mmol/L (EDTA), transferring pH is 8.0.
The high conserved dna fragment cloning of embodiment 2 B breve ATCC, 15700 alpha-galactosidase genes
From GenBank, retrieve the dna sequence dna of the alpha-galactosidase gene of different strains,, utilize primer-design software Primer5.0 to design a pair of degenerate pcr primer with online software Clustal W comparative sequences homology:
Wtz-F：5’-(TC)TI?AA(TC)A(AC)(N)TGG?GA(AG)G-3’
Wtz-R：5’-(GA)TC?CCA(CT)TT(N)A(CT)(GA)TA(GA)TC-3’
B breve ATCC 15700 chromosomal DNAs with extraction are template, carry out PCR with above-mentioned primer.Pcr amplification system cumulative volume is 50 μ L, contains ultrapure water 35 μ L, 10 * PCR buffer, 5 μ L, dNTP2.4mmol/L, each 1 μ mol/L of primer, MgCl
21.5mmol/L, template DNA 100ng, TaKaRa Taq 2 5U.Pcr amplification condition: 95 ℃ of pre-sex change 5 minutes; React 28 circulations (72 ℃ were extended 1 minute for 95 ℃ of sex change 1 minute, 52 ℃ of annealing 1 minute); 72 ℃ were extended 10 minutes after 28 loop ends.The PCR product is about about 460bp, through agarose gel electrophoresis, and ethidium bromide staining, uv analyzer detects, and reclaims then, and products therefrom is the high conserved dna fragment of B breve ATCC 15700 alpha-galactosidase genes, records sequence such as SEQ ID No.2.
Detailed row are as follows:
gattatccca?ctttatgtag?tctatgccga?gttcgctcac?aagcgcatcc?atgcagccgt 60
acacctagcc?gtaggcctgt?gggttcgtca?ggtcgaccac?ctgctggttg?cggccctgca 120
ttggcaggcg?atgcgccgtg?gggcgcagca?cccagtcggg?gtgctctcgg?tacatgtccg 180
aatcgggatt?caccatctct?ggctcgaacc?acaagccgaa?ctccatgcct?ttggcgtgca 240
cgtagtcggc?gagcgccttg?agtgaatggt?cgccgtctgg?ccacacgtcc?tgagctatgt 300
gccagtcgcc?cagcccagcg?gtatcgtcgc?gccgggcgcc?gaaccacccg?tcgtccacca 360
cgaagcgttc?cacgccgcta?gcggcggcct?tgtcggcgag?cgccttcaac?gtgtcgaaat 420
catgctggaa?ctacaccgcc?tcccatgtgt?tcaaatc 480
Above-mentioned alpha-galactosidase gene conserved sequence dna fragmentation is with the 2 strain bifidus bacilluss of having reported---the alpha-galactosidase gene of bifidobacterium adolescentis (B adolescentis) and bifidus longum bb (B longum) all has higher homology, illustrate that this conserved dna fragment is suitable as probe and carries out mark very much, carry out Southern hybridization with the DNA of B breve ATCC 15700, screening B breve ATCC 15700 alpha-galactosidase genes.
Embodiment 3 B.breve ATCC 15700 alpha-galactosidase full gene clonings
(1) structure in B breve ATCC 15700 portion gene libraries
B breve ATCC 15700 chromosomal DNAs carry out six groups of complete degestions after extracting simultaneously, and six groups of enzymes are respectively BamH I-HindIII, BamH I-Nde I, BamH I-Xba I, HindIII-Nde I, HindIII-Xba I, BamH I (TaKaRa).Change film behind the electrophoresis, using the dna fragmentation of the 457bp that has cloned is probe, carries out Southern hybridization.The result shows B breve ATCC 15700 chromosomal DNAs behind BamH I and Nde I double digestion, can with the fragment of probe hybridization about 6kb, can be used for making up the portion gene library.Through the experiment estimation, about 81.3% reorganization bacterium is connected with the external source fragment in the portion gene library, the library construction success.
(2) contain screening, checking and the sequencing of alpha-galactosidase gene recombinant plasmid
Select the single colony inoculation of reorganization bacterium in 5ml LB ammonia liquor benzyl (100 μ g/mL) substratum, 37 ℃ of shaking tables that spend the night are cultivated, centrifugal collection mycetocyte, the mensuration enzyme is lived, screen the reorganization bacterium (being numbered 51) of alpha-galactosidase hydrolytic activity, extract plasmid and carry out BamH I single endonuclease digestion and the checking of BamH I-HindIII double digestion respectively, the result shows, single endonuclease digestion obtains the band about 11.5kb, and double digestion obtains about 5.5kb and 6kb about two bands, meet the segmental size of carrier and external source respectively.The bacteria plasmid of should recombinating checks order, and order-checking is finished by Shanghai Bo Ya Bioisystech Co., Ltd.
Above-mentioned LB culture medium prescription is: peptone 10g/L, and yeast powder 5g/L, sodium-chlor 7g/L, pH 7.0～7.5, sterilize 20 minutes for 121 ℃.
Above-mentioned alpha-galactosidase hydrolytic activity is measured:
Get mycetocyte 30mg, the 2mmol/L pNPG that adds the preparation of 150 μ L 50mmol/L sodium-acetate buffers (pH5.5), 37 ℃ of reactions added 1.05ml, 0.2mol/L, pH 10.5 borate buffer termination reactions after 10 minutes, 12000 rev/mins centrifugal 2 minutes, supernatant liquor is in the 400nm colorimetric.The unit of activity regulation: the Glycosylase amount that per minute hydrolysis from p-NP glucosides substrate discharges 1 μ mol nitrophenols is 1 enzyme unit (U) alive.
(3) B breve ATCC 15700 alpha-galactosidase gene sequences determines
The sequence that above-mentioned order-checking obtains is analyzed, show an open reading frame, form by 2226 Nucleotide, 741 amino acid of encoding, with the alpha-galactosidase amino acid sequence homology of the bifidobacterium adolescentis of having delivered, bifidus longum bb all above 70%, and the conserved sequence pattern with alpha-galactosidase, thereby determine that this nucleotides sequence classifies B breve ATCC 15700 alpha-galactosidase complete genome sequences as, shown in SEQ ID No.1.
The subclone of embodiment 4 B.breve ATCC 15700 alpha-galactosidase genes and the expression in intestinal bacteria thereof
Design primer, introducing can insert the Nde I and the BamH I restriction enzyme site (the pET-22b plasmid vector has C end 6His mark, is convenient to the purifying of expressing protein) of pET-22b plasmid (Novagen), and sequence is as follows:
22b-F：5’-CTCTCATATGATGGCAATCATGGATTTCCACGGGAG-3’
22b-R：5’-ATATGGATCCGCTCTCACGCGCGTGGCGCTGAAC-3’
The bacterium 51 of will recombinating is inoculated in the 5ml LB ammonia liquor benzyl substratum, and 37 ℃ of shaking tables that spend the night are cultivated, and extract plasmid DNA as template, adopt above-mentioned primer to carry out pcr amplification.Pcr amplification system cumulative volume is 50 μ L, contains ultrapure water 35 μ L, 10 * PCR buffer, 5 μ L, dNTP2.4mmol/L, each 1 μ mol/L of primer, MgCl
21.5mmol/L, template DNA 100ng, TaKaRa LA Taq 2.5U.Pcr amplification condition: 95 ℃ of pre-sex change 5 minutes; React 28 circulations (72 ℃ were extended 2 minutes for 95 ℃ of sex change 1 minute, 52 ℃ of annealing 1 minute); 72 ℃ were extended 10 minutes after 28 loop ends.The PCR product is about about 2.2kb, through agarose gel electrophoresis, and ethidium bromide staining, uv analyzer detects, and reclaims then, and products therefrom is the full gene fragment of B.breve ATCC 15700 alpha-galactosidases.Add Nde I and BamH I successively and cut 3 hours, carry out agarose gel electrophoresis in 37 ℃ of enzymes, ethidium bromide staining, uv analyzer detects, and reclaims the purpose fragment, adopts same enzyme blanking method to handle the pET-22b plasmid vector simultaneously.The enzyme gene fragment for preparing is mixed by a certain percentage with the pET-22b carrier, adopt to connect test kit (TaKaRa DNA Ligation Kit Ver.2.0) in 16 ℃ of connections 8 hours.Adopt CaCl then
2Conversion method transforms host bacterium E coli BL21 (DE3), transformed bacteria liquid coating penbritin flat board, 37 ℃ of incubated overnight.Extract positive bacterium colony plasmid, enzyme is cut checking, and the reorganization bacterium that plasmid enzyme restriction is correct is expressed experiment, promptly recombinate bacterium behind the IPTG inducing culture, centrifugal collection mycetocyte is surveyed the alpha-galactosidase hydrolytic activity and is changeed the glycosyl activity, and complete satisfactory reorganization bacterium is preserved as bacterial classification.
Above-mentioned alpha-galactosidase hydrolytic activity measuring method is with embodiment 3.
Above-mentioned alpha-galactosidase changes the glycosyl activity determination method:
Get the 50mg mycetocyte, be suspended in the potassium phosphate buffer of 1mL pH7.0,10mmol/L, in ice-water bath granulated glass sphere smudge cells, suspension in 10000 rev/mins centrifugal 20 minutes, the gained supernatant liquor is crude enzyme liquid.Get 20 μ L crude enzyme liquids, add the 100mmol/L melibiose or the raffinose solution of 100 μ L pH7.0 potassium phosphate buffers preparations, in 37 ℃ of reactions 2 hours, 12,000 rev/mins centrifugal 5 minutes, supernatant liquor is reaction product.
Reaction product is carried out thin-layer chromatography, and (Thin-Layer Chromatography TLC) analyzes, and determines to change the glycosyl activity.TLC thin plate (Silica gel60, No.553, Merck) behind the point sample, at developing agent (propyl carbinol: ethanol: water=5: 3: 2, v/v/v) middle exhibition layer, spray painting developer (3 of 20% sulphuric acid soln+0.5%, the 5-orcin), in 120 ℃ of bakings 10 minutes, sugared spot colour developing, if generated new macromole oligosaccharides spot below the substrate sugar spot, then alpha-galactosidase has the glycosyl of commentaries on classics activity.
The expression and purification of embodiment 5 B breve ATCC 15700 alpha-galactosidase genes in intestinal bacteria
E coli BL21 (DE3) the reorganization bacterium that embodiment 4 is preserved is inoculated in 200mL LB ammonia benzyl nutrient solution, cultivates 12 hours for 37 ℃, transfers in 2L LB ammonia benzyl nutrient solution, and 37 ℃ of cultivations are measured the absorbancy of nutrient solution under 600nm and changed.When light absorption value reaches 0.5～0.8, add IPTG to final concentration 1mmol/L, continue again to cultivate 3～5 hours, in 12000 rev/mins centrifugal 3 minutes, obtain cell precipitation, be suspended in 80mLpH7.0, the potassium phosphate buffer of 10mmol/L.Ultrasonic disruption cell in ice-water bath, broken liquid in 4 ℃ with 12000 rev/mins centrifugal 20 minutes, the gained supernatant is crude enzyme liquid.
Crude enzyme liquid is removed the foreign protein of not being with the 6His mark with Ni-NTA Agarose (QIAGEN) affinity column chromatography, has obtained the pure alpha-galactosidase of electrophoresis with DEAE Sepharose Fast Flow column chromatography then.
The basic enzymatic property of embodiment 6 B breve ATCC 15700 reorganization alpha-galactosidases
(1) molecular weight of enzyme
The mensuration employing polyacrylamide gel electrophoresis of zymoprotein molecular weight (polyacrylamide gel electrophoresis, PAGE).PAGE with standard protein schemes the relative migration value R of working sample and standard protein per sample
f, with the R of standard protein
fValue is made typical curve to the logarithm of molecular weight.Again according to the R of pure enzyme sample
fValue just can be tried to achieve its molecular weight.SDS-PAGE adopts vertical board-like discontinuous system electrophoresis mode, and the electrophoretic separation gum concentration is 12%, and concentrated glue is 4%; Native gradient PAGE (the non-gradient polyacrylamide gel electrophoresis of dissociating) adopts the vertical tabular polyacrylamide gel of 5～20% linear gradient, 4 ℃ of electrophoresis.
Native gradient PAGE shows that the molecular weight of zymoprotein is about 160kD, and SDS-PAGE shows that zymoprotein list molecular weight subunit is about 80kD, shows that this enzyme is a two protein subunit.
(2) kinetic parameter of enzyme
The mensuration of the kinetic parameter of enzyme adopts two counting backward techniques.
(the pNPG solution of concentration range 0.24～1.75mmol/L) mixes, and in 37 ℃ of reactions 3 minutes, adds 1.05mL 0.2mol/L, pH 10.5 borate buffer termination reactions, measures OD with 150 μ L different concns with the pure enzymes of 30 μ L (1.42U/mL)
400, calculate hydrolysis rate, record the K of enzyme with the double-reciprocal plot method to pNPG
mValue is 0.17mmol/L, V
MaxBe 4.43 μ mol/ (Lmin).
(the melibiose solution of concentration range 0.072～0.35mol/L) mixes with 150 μ L different concns with the pure enzymes of 30 μ L (2.5U/mL), in 37 ℃ of reactions 30 minutes, measure the glucose content of hydrolysis with Reagent kit of glucose (Fenghui Medical Science and Technology Co., Ltd., Shanghai), calculate hydrolysis rate, record the K of enzyme melibiose with the double-reciprocal plot method
mValue is 0.66mmol/L, V
MaxBe 0.58 μ mol/ (Lmin).
(the raffinose solution of concentration range 0.072～0.35mol/L) mixes with 150 μ L different concns with the pure enzymes of 30 μ L (2.5U/mL), in 37 ℃ of reactions 30 minutes, with 3, the fixed sugared method of 5-dinitrosalicylic acid colorimetric is measured the reducing sugar content in the hydrolysis reaction product, calculate hydrolysis rate, record the K of enzyme raffinose with the double-reciprocal plot method
mValue is 2.20mmol/L, V
MaxBe 0.65 μ mol/ (Lmin).
(3) temperature and pH are to the influence of enzymic activity
In suitable temperature range (20 ℃～70 ℃), per 5 ℃ is that the relative enzyme of a gradient mensuration enzyme under this temperature lived.The result shows: the temperature of the suitable reaction of enzyme is 37 ℃～40 ℃, and optimal reactive temperature is 37 ℃.Enzyme is measured relative enzyme in insulation under the said temperature gradient after 2 hours live.The result shows: enzyme is more stable below 40 ℃, and inactivation is very fast more than 60 ℃, and 70 ℃ lose all enzymes and live.
With the damping fluid preparation enzyme reaction system of different pH, measure relative enzyme and live, the result shows: the pH of the suitable reaction of enzyme is 5.5～6.5, and optimal reaction pH is 5.5～6.0; Enzyme in the damping fluid of different pH 4 ℃ preserved 24 hours, measure relative enzyme and live, the result shows: enzyme is stable in pH 5.5～95 scopes.
Above-mentioned enzyme activity determination method is: the 30 μ L suitably pure enzyme of dilution mix with the pNPG solution of 150 μ L 2mmol/L, in 37 ℃ of reactions 10 minutes, add the borate buffer termination reaction of 1.05mL 0.2mol/L, pH 10.5, measure OD
400
Above-mentioned different pH damping fluid is respectively: acetic acid-sodium-acetate buffer pH3.5～6.0; Dipotassium hydrogen phosphate-potassium phosphate buffer pH5.5～8.0; Boric acid-sodium hydrate buffer solution pH8.0～10.0.
(4) part metals ion and compound are to the influence of enzymic activity
With pNPG is substrate, and adding final concentration in the enzyme activity determination reaction system respectively is each metal ion species of 1mmol/L, EDTA, the DTT of 10mmol/L, measures relative enzyme and lives.The result shows, Hg
2+, Cu
2+, Ag
+The activity of strongly inhibited enzyme, Co
2+, Mg
2+, Ca
2+, Mn
2+, Zn
2+, DTT, EDTA do not have restraining effect to the activity of enzyme.
Embodiment 7 B.breve ATCC 15700 recombinases are the commentaries on classics glycosyl reaction of substrate with melibiose and raffinose
100mmol/L melibiose and raffinose solution with the preparation of 20 μ L pH7.0 potassium phosphate buffers, reacted 2 hours in 37 ℃ with the pure enzyme of 4 μ L respectively, 100 ℃ are boiled 5 minutes inactivator liquid, and (Thin-LayerChromatography TLC) analyzes to carry out thin-layer chromatography then.The TLC thin plate (Silica gel60, No.553 is Merck) behind the point sample, at developing agent (propyl carbinol: ethanol: water=5: 3: 2, v/v/v) middle exhibition layer, spray painting developer (3 of 20% sulphuric acid soln+0.5%, the 5-orcin), in 120 ℃ of bakings 10 minutes, sugared spot colour developing.As Fig. 1, Fig. 2, generated new macromole oligosaccharides spot below the substrate sugar spot, be to change the glycosyl product.The main commentaries on classics glycosyl product structure of this enzyme in the melibiose reaction system is Gal α (1 → 4) Gal α (1 → 6) Glc, and in the world in the report of existing alpha-galactosidase, the of bonding that galactosyl is gone to melibiose all is α (1 → a 6) key.
Embodiment 8 B breve ATCC 15700 recombinases are subjected to sugared body substrate specificity widely
B breve ATCC 15700 recombinases have and are subjected to sugared body substrate specificity widely, can with pNPG glycosyl donor, galactosyl is transferred on multiple sugar, the alkylol cpd, as semi-lactosi, wood sugar, glucose, fructose, seminose, sorbose, rhamnosyl, trehalose, sucrose, lactose, cellobiose, sorbyl alcohol, inositol, N.F,USP MANNITOL etc.
100mmol/L sugar or pure receptor solution, 3 μ L100mmol/LpNPG and the pure enzyme of 5 μ L of 17 μ L 10mmol/L pH7.0 potassium phosphate buffers preparations react in 37 ℃, sampling in 5 hours.Do control experiment simultaneously, do not add glycosyl donor pNPG, sampling in 0 hour, 5 hours.Carry out TLC then and analyze, the result shows, when pNPG is glycosyl donor, new sugared spot occurred below the semi-lactosi spot that original saccharide acceptor (alcohol because of can not develop the color except) and hydrolysis produce, and is the α-galactosyl oligosaccharides and the glycoconjugate of commentaries on classics glycosyl generation.In control experiment, do not generate new sugared spot, illustrate that above-mentioned acceptor molecule can not issue in the effect of enzyme and be conigenous commentaries on classics.Recombinase is subjected to sugared body substrate specificity widely, can be in order to synthetic multiple α-galactosyl oligosaccharides and glycoconjugate.
Sequence table
SEQ?ID?No.1
＜110〉Shandong University
＜120〉a kind of commentaries on classics glycosyl alpha-galactosidase gene
<141>2005-9-26
<160>2
<210>1
<211>2226
<212>DNA
＜213〉bifidobacterium breve (Bifidobacterium breve) ATCC 15700
＜221〉bifidobacterium breve (Bifidobacterium breve) ATCC 15700 changes the glycosyl alpha-galactosidase gene
<222>(1)...(2226)
<400>1
atg?gct?ata?atg?gat?ttc?cac?ggg?agt?tcg?agc?cgg?ggc?gaa?gat?ata?cac?gtg?gtg?tag 60
Met?Ala?Ile?Met?Asp?Phe?His?Gly?Ser?Ser?Ser?Arg?Gly?Glu?Asp?Ile?His?Val?Val?Tyr
1 5 10 15 20
gtc?gag?cag?cgg?gac?gcg?cgg?tcc?gcg?ttc?gct?ttc?gcg?att?gtg?gat?cgc?gag?ctg?cca 120
Val?Glu?Gln?Arg?Asp?Ala?Arg?Ser?Ala?Phe?Ala?Phe?Ala?Ile?Val?Asp?Arg?Glu?Leu?Pro
25 30 35 40
cgc?ata?gtg?cat?tgg?ggc?cgg?cca?ctc?tcc?gac?cca?cgc?aca?ctc?gtg?gct?gcg?gtg?gat 180
Arg?Ile?Val?His?Trp?Gly?Arg?Pro?Leu?Ser?Asp?Pro?Arg?Thr?Leu?Val?Ala?Ala?Val?Asp
45 50 55 60
gcg?ctg?cgc?cca?cag?cgg?gtg?tcc?ggc?gcg?ctc?gac?gag?acg?gcc?tgg?cca?agc?ata?ctg 240
Ala?Leu?Arg?Pro?Gln?Arg?Val?Ser?Gly?Ala?Leu?Asp?Glu?Thr?Ala?Trp?Pro?Ser?Ile?Leu
65 70 75 80
ccc?acg?cag?gcc?gaa?gct?tgg?acc?ggc?gcg?cca?cgc?ttc?gtg?gtg?cgc?gcc?ggc?ggc?gtg 300
Pro?Thr?Gln?Ala?Glu?Ala?Trp?Thr?Gly?Ala?Pro?Arg?Phe?Val?Val?Arg?Ala?Gly?Gly?Val
85 90 95 100
gag?ctg?ttc?tgc?cgc?ttc?acc?gtg?acc?gat?gtg?cgc?ata?gac?gat?ggc?ggc?gct?acg?gtg 360
Glu?Leu?Phe?Cys?Arg?Phe?Thr?Val?Thr?Asp?Val?Arg?Ile?Asp?Asp?Gly?Gly?Ala?Thr?Val
105 110 115 120
agc?gcc?gag?gac?gcc?gag?cag?ggc?gtg?cgc?gtg?ctg?tgg?cgg?tgc?gaa?ctg?cgg?gaa?agc 420
Ser?Ala?Glu?Asp?Ala?Glu?Gln?Gly?Val?Arg?Val?Leu?Trp?Arg?Cys?Glu?Leu?Arg?Glu?Ser
125 130 135 140
ggc?ctc?gtg?cgc?caa?cgc?atg?tcg?gtt?gtg?aac?atg?cgc?gcc?gag?gaa?ctg?gaa?ata?ggc 480
Gly?Leu?Val?Arg?Gln?Arg?Met?Ser?Val?Val?Asn?Met?Arg?Ala?Glu?Glu?Leu?Glu?Ile?Gly
145 150 155 160
acg?gtg?gag?ctc?gct?ttc?ccc?gtg?ccc?gcg?gac?atg?acc?gag?ata?ctc?acg?acg?acc?ggc 540
Thr?Val?Glu?Leu?Ala?Phe?Pro?Val?Pro?Ala?Asp?Met?Thr?Glu?Ile?Leu?Thr?Thr?Thr?Gly
165 170 175 180
cac?cac?ctg?cgc?gaa?cgc?tcg?cca?cag?cgc?cag?cca?ttc?acg?ata?ggc?cgg?ttc?cag?aag 600
His?His?Leu?Arg?Glu?Arg?Ser?Pro?Gln?Arg?Gln?Pro?Phe?Thr?Ile?Gly?Arg?Phe?Gln?Lys
185 190 195 200
gcg?agc?ctc?gtg?gga?cgc?ccc?gat?ttc?gat?tcg?tcg?ctg?ctg?ctg?aac?gtg?ggc?cgc?ccc 660
Ala?Ser?Leu?Val?Gly?Arg?Pro?Asp?Phe?Asp?Ser?Ser?Leu?Leu?Leu?Asn?Val?Gly?Arg?Pro
205 210 215 220
ggc?ttc?ggt?ttc?acg?cac?ggc?gac?gtg?tac?tcc?gtg?cat?gtg?gcc?tgg?agc?ggc?aac?tca 720
Gly?Phe?Gly?Phe?Thr?His?Gly?Asp?Val?Tyr?Ser?Val?His?Val?Ala?Trp?Ser?Gly?Asn?Ser
225 230 235 240
ctc?atg?gcc?gcg?gaa?cgg?ctg?cca?tac?acc?tcc?ggc?ctg?ata?ggc?ggc?gcg?gaa?gcg?ctt 780
Leu?Met?Ala?Ala?Glu?Arg?Leu?Pro?Tyr?Thr?Ser?Gly?Leu?Ile?Gly?Gly?Ala?Glu?Ala?Leu
245 250 255 260
tcc?ggc?ggg?gaa?gtg?acg?ttg?tgt?gcg?gac?ggg?gac?gat?aac?cgc?tac?acg?aca?cca?tgg 840
Ser?Gly?Gly?Glu?Val?Thr?Leu?Cys?Ala?Asp?Gly?Asp?Asp?Asn?Arg?Tyr?Thr?Thr?Pro?Trp
265 270 275 280
ctg?tac?ggc?tcg?tac?ggc?gaa?ggg?ttc?aac?gag?gtg?gct?tca?cgc?ttc?cac?aac?gaa?ctg 900
Leu?Tyr?Gly?Ser?Tyr?Gly?Glu?Gly?Phe?Asn?Glu?Val?Ala?Ser?Arg?Phe?His?Asn?Glu?Leu
285 290 295 300
cgc?gcg?acg?cac?gcg?cag?tgg?cgc?gcc?gaa?ctc?ggt?gtg?gcc?gaa?aaa?cca?cgc?ccc?gtg 960
Arg?Ala?Thr?His?Ala?Gln?Trp?Arg?Ala?Glu?Leu?Gly?Val?Ala?Glu?Lys?Pro?Arg?Pro?Val
305 310 315 320
atc?ctc?aac?aca?tgg?gag?gcg?gtg?tag?ttc?cag?cat?gat?ttc?gac?acg?ttg?aag?gcg?ctc 1020
Ile?Leu?Asn?Thr?Trp?Glu?Ala?Val?Tyr?Phe?Gln?His?Asp?Phe?Asp?Thr?Leu?Lys?Ala?Leu
325 330 335 340
gcc?gac?aag?gcc?gcc?gct?agc?ggc?gtg?gaa?cgc?ttc?gtg?gtg?gac?gac?ggg?tgg?ttc?ggc 1080
Ala?Asp?Lys?Ala?Ala?Ala?Ser?Gly?Val?Glu?Arg?Phe?Val?Val?Asp?Asp?Gly?Trp?Phe?Gly
345 350 355 360
gcc?cgg?cgc?gac?gat?acc?gct?ggg?ctg?ggc?gac?tgg?cac?ata?gct?cag?gac?gtg?tgg?cca 1140
Ala?Arg?Arg?Asp?Asp?Thr?Ala?Gly?Leu?Gly?Asp?Trp?His?Ile?Ala?Gln?Asp?Val?Trp?Pro
365 370 375 380
gac?ggc?gac?cat?tca?ctc?aag?gcg?ctc?gcc?gac?tac?gtg?cac?gcc?aaa?ggc?atg?gag?ttc 1200
Asp?Gly?Asp?His?Ser?Leu?Lys?Ala?Leu?Ala?Asp?Tyr?Val?His?Ala?Lys?Gly?Met?Glu?Phe
385 390 395 400
ggc?ttg?tgg?ttc?gag?cca?gag?atg?gtg?aat?ccc?gat?tcg?gac?atg?tac?cga?gag?cac?ccc 1260
Gly?Leu?Trp?Phe?Glu?Pro?Glu?Met?Val?Asn?Pro?Asp?Ser?Asp?Met?Tyr?Arg?Glu?His?Pro
405 410 415 420
gac?tgg?gtg?ctg?cgc?ccc?acg?gcg?cat?cgc?ctg?cca?atg?cag?ggc?cgc?aac?cag?cag?gtg 1320
Asp?Trp?Val?Leu?Arg?Pro?Thr?Ala?His?Arg?Leu?Pro?Met?Gln?Gly?Arg?Asn?Gln?Gln?Val
425 430 435 440
gtc?gac?ctg?acg?aac?cca?cag?gcc?tac?ggc?tag?gtg?tac?ggc?tgc?atg?gat?gcg?ctt?gtg 1380
Val?Asp?Leu?Thr?Asn?Pro?Gln?Ala?Tyr?Gly?Tyr?Val?Tyr?Gly?Cys?Met?Asp?Ala?Leu?Val
445 450 455 460
agc?gaa?ctc?ggc?ata?gac?tac?ata?aag?tgg?gac?cac?aac?aaa?tag?gtg?acc?gaa?gcg?gtg 1440
Ser?Glu?Leu?Gly?Ile?Asp?Tyr?Ile?Lys?Trp?Asp?His?Asn?Lys?Tyr?Val?Thr?Glu?Ala?Val
465 470 475 480
tcg?cca?cgc?acc?ggc?cga?cca?gcc?gtg?cat?ggg?cag?aca?ctc?gcc?gtg?tac?cgc?ata?ttc 1500
Ser?Pro?Arg?Thr?Gly?Arg?Pro?Ala?Val?His?Gly?Gln?Thr?Leu?Ala?Val?Tyr?Arg?Ile?Phe
485 490 495 500
cgc?gac?ctc?aaa?acc?gcg?cac?ccc?ggc?ctg?gag?ata?gaa?agc?tgc?tcg?tcc?ggc?ggc?ggc 1560
Arg?Asp?Leu?Lys?Thr?Ala?His?Pro?Gly?Leu?Glu?Ile?Glu?Ser?Cys?Ser?Ser?Gly?Gly?Gly
505 510 515 520
cgc?gtg?gac?ctc?gcg?ata?ctc?tcg?ctc?gcc?gac?cgc?ata?tgg?gcg?tcg?gat?tgc?gtg?gat 1620
Arg?Val?Asp?Leu?Ala?Ile?Leu?Ser?Leu?Ala?Asp?Arg?Ile?Trp?Ala?Ser?Asp?Cys?Val?Asp
525 530 535 540
ccg?gtg?gaa?cgc?gcg?gac?ata?cag?cgc?tac?acg?tcg?ctt?ctc?gtg?cca?cca?gag?atg?ata 1680
Pro?Val?Glu?Arg?Ala?Asp?Ile?Gln?Arg?Tyr?Thr?Ser?Leu?Leu?Val?Pro?Pro?Glu?Met?Ile
545 550 555 560
ggc?gaa?cat?gtg?ggc?gcg?agc?ccc?gcg?cat?tcc?acc?cac?cgg?gcg?acg?agc?cag?cag?atg 1740
Gly?Glu?His?Val?Gly?Ala?Ser?Pro?Ala?His?Ser?Thr?His?Arg?Ala?Thr?Ser?Gln?Gln?Met
565 570 575 580
cgc?atg?gcg?atg?gcg?ttc?ttc?ggg?cat?ctg?ggc?ata?gaa?tgg?aac?ctg?ctc?aag?gaa?cca 1800
Arg?Met?Ala?Met?Ala?Phe?Phe?Gly?His?Leu?Gly?Ile?Glu?Trp?Asn?Leu?Leu?Lys?Glu?Pro
585 590 595 600
cag?tcg?gcg?ctc?gac?gaa?ctc?ggt?gtg?tgg?gtg?gac?gcg?tac?aag?cgg?cac?cgc?gcg?gac 1860
Gln?Ser?Ala?Leu?Asp?Glu?Leu?Gly?Val?Trp?Val?Asp?Ala?Tyr?Lys?Arg?His?Arg?Ala?Asp
605 610 615 620
ttc?gcg?cac?ggc?acc?gtg?gtg?cac?ggc?gat?gcg?gcc?gat?ccc?gcg?gtg?cgc?gtg?gat?ggc 1920
Phe?Ala?His?Gly?Thr?Val?Val?His?Gly?Asp?Ala?Ala?Asp?Pro?Ala?Val?Arg?Val?Asp?Gly
625 630 635 640
gtc?gtg?agc?gcc?agc?ggc?gaa?cgc?gcc?gtg?tac?cgc?ttc?acg?caa?ttg?acg?aca?tcg?cag 1980
Val?Val?Ser?Ala?Ser?Gly?Glu?Arg?Ala?Val?Tyr?Arg?Phe?Thr?Gln?Leu?Thr?Thr?Ser?Gln
645 650 655 660
acc?tac?cca?gcg?gct?cca?gtg?cgc?ctg?cca?gga?ctc?gcc?cca?gac?gcc?gac?tag?ctg?ata 2040
Thr?Tyr?Pro?Ala?Ala?Pro?Val?Arg?Leu?Pro?Gly?Leu?Ala?Pro?Asp?Ala?Asp?Tyr?Leu?Ile
665 670 675 680
cag?cca?ctc?gct?tgc?aat?ctc?gcc?agc?ggc?gag?cca?ttc?aca?caa?ata?ggt?aac?ggg?cag 2100
Gln?Pro?Leu?Ala?Cys?Asn?Leu?Ala?Ser?Gly?Glu?Pro?Phe?Thr?Gln?Ile?Gly?Asn?Gly?Gln
685 690 695 700
agc?gaa?ctc?ggc?tgg?tgg?aac?agc?caa?ggc?gtg?gtg?atg?aac?ggc?ggt?gcg?ctc?gac?gcg 2160
Ser?Glu?Leu?Gly?Trp?Trp?Asn?Ser?Gln?Gly?Val?Val?Met?Asn?Gly?Gly?Ala?Leu?Asp?Ala
705 710 715 720
ttc?ggc?ttg?cgc?cca?cca?tgc?ata?cac?cca?gcg?aac?gcc?gtg?ctg?ttc?agc?gcc?acg?cgc 2220
Phe?Gly?Leu?Arg?Pro?Pro?Cys?Ile?His?Pro?Ala?Asn?Ala?Val?Leu?Phe?Ser?Ala?Thr?Arg
725 730 735 740
gtg?tga 2280
Val
741
SEQ?ID?No?2
<210>2
<211>457
<212>DNA
＜221〉the high conserved dna fragment of B.breve ATCC 15700 alpha-galactosidase genes
<222>(1)…(457)
<400>2
gattatccca?ctttatgtag?tctatgccga?gttcgctcac?aagcgcatcc?atgcagccgt 60
acacctagcc?gtaggcctgt?gggttcgtca?ggtcgaccac?ctgctggttg?cggccctgca 120
ttggcaggcg?atgcgccgtg?gggcgcagca?cccagtcggg?gtgctctcgg?tacatgtccg 180
aatcgggatt?caccatctct?ggctcgaacc?acaagccgaa?ctccatgcct?ttggcgtgca 240
cgtagtcggc?gagcgccttg?agtgaatggt?cgccgtctgg?ccacacgtcc?tgagctatgt 300
gccagtcgcc?cagcccagcg?gtatcgtcgc?gccgggcgcc?gaaccacccg?tcgtccacca 360
cgaagcgttc?cacgccgcta?gcggcggcct?tgtcggcgag?cgccttcaac?gtgtcgaaat 420
catgctggaa?ctacaccgcc?tcccatgtgt?tcaaatc 480
Claims (6)
1. one kind is changeed the glycosyl alpha-galactosidase gene,
(1) has nucleotide sequence shown in SEQ ID No.1, total length 2226 bases; Or
(2) 741 amino acid of this genes encoding, this aminoacid sequence is shown in SEQ ID No.1.
2. the application of the described commentaries on classics glycosyl of claim 1 alpha-galactosidase gene is characterized in that, with described gene clone to the pET-22b plasmid expression vector, at the expression in escherichia coli alpha-galactosidase;
Wherein: said gene is two protein subunits at the enzyme of expression in escherichia coli, and the polymer molecule amount is about 160kD, and single molecular weight subunit is about 80kD; Enzyme is to the K of p-NP α-D-galactoside
mBe 0.17mmol/L, V
MaxBe 4.43 μ mol/ (Lmin), the English name of described p-NP α-D-galactoside is p-nitrophenyl-α-D-galactopyranoside, is called for short pNPG; K to melibiose and raffinose
mValue is respectively 0.66mmol/L, 2.20mmol/L, V
MaxBe respectively 0.58 μ mol/ (Lmin), 0.65 μ mol/ (Lmin); Enzyme is 37 ℃～40 ℃ to the temperature of the suitable reaction of pNPG, and the pH of suitable reaction is 5.5～6.5; Enzyme is when preserving for 4 ℃, and stable at least preservation is 24 hours in pH 5.5～9.5 scopes; Hg
2+, Cu
2+, Ag
+The activity of strongly inhibited enzyme, Co
2+, Mg
2+, Ca
2+, Mn
2+, Zn
2+, DTT, EDTA do not suppress enzymic activity; Enzyme has the glycosyl of commentaries on classics activity in the reaction system of hydrolysis melibiose or raffinose, have the glycosyl of commentaries on classics product to generate in the reaction, and wherein, the main commentaries on classics glycosyl product structure of enzyme in the melibiose reaction system is Gal α (1 → 4) Gal α (1 → 6) Glc; Enzyme can be transferred to galactosyl on multiple sugar, the alkylol cpd when being glycosyl donor with pNPG.
3. as the application of commentaries on classics glycosyl alpha-galactosidase gene as described in the claim 2, it is characterized in that described enzyme is 37 ℃ to the optimal reactive temperature of pNPG.
4. as the application of commentaries on classics glycosyl alpha-galactosidase gene as described in the claim 2, it is characterized in that described enzyme is 5.5～6.0 to the optimal reaction pH of pNPG.
5. as the application of commentaries on classics glycosyl alpha-galactosidase gene as described in the claim 2, it is characterized in that described sugar, alkylol cpd are semi-lactosi, wood sugar, glucose, fructose, seminose, sorbose, rhamnosyl, trehalose, sucrose, lactose, cellobiose, sorbyl alcohol, inositol, N.F,USP MANNITOL.
6. as the application of commentaries on classics glycosyl alpha-galactosidase gene as described in claim 2 or 5, it is characterized in that, described enzyme has and is subjected to sugared body substrate specificity widely, and enzyme is transferred to galactosyl on described sugar, the alkylol cpd, in order to synthetic multiple α-galactosyl oligosaccharides and glycoconjugate.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892207A (en) * | 2010-07-23 | 2010-11-24 | 中国农业科学院饲料研究所 | Low-temperature alpha-galactosidase GalA17, gene thereof and application thereof |
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| CN102154411B (en) * | 2011-01-07 | 2013-04-03 | 山东大学 | Method for preparing Globotriose oligosaccharide |
| CN105087424B (en) * | 2015-06-10 | 2018-12-25 | 南京工业大学 | Organic solvent-resistant transglycosylation β -galactosidase high-yield strain, and gene and application of galactosidase |
| CN105177085B (en) * | 2015-08-13 | 2018-11-02 | 山东大学 | A kind of single-minded application for turning glycosyl alpha-galactosidase of regioselectivity |
| CN108148824B (en) * | 2018-03-09 | 2022-07-29 | 南京工业大学 | Organic solvent-resistant efficient galactosidase and application thereof |
| CN112646796A (en) * | 2021-01-13 | 2021-04-13 | 马金佑 | Preparation of thermostable beta-galactosidase |
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| US6544765B1 (en) * | 1999-02-22 | 2003-04-08 | Novozymes, A/S | Oxaloacetate hydrolase deficient fungal host cells |
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| CN101892207A (en) * | 2010-07-23 | 2010-11-24 | 中国农业科学院饲料研究所 | Low-temperature alpha-galactosidase GalA17, gene thereof and application thereof |
| CN101892207B (en) * | 2010-07-23 | 2011-12-28 | 中国农业科学院饲料研究所 | Low-temperature alpha-galactosidase GalA17, gene thereof and application thereof |
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|---|---|
| CN1778928A (en) | 2006-05-31 |
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