CN1566341A - In vitro molecular directed evolution method for reshaping antibody - Google Patents
In vitro molecular directed evolution method for reshaping antibody Download PDFInfo
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- CN1566341A CN1566341A CN 03141156 CN03141156A CN1566341A CN 1566341 A CN1566341 A CN 1566341A CN 03141156 CN03141156 CN 03141156 CN 03141156 A CN03141156 A CN 03141156A CN 1566341 A CN1566341 A CN 1566341A
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Abstract
The invention relates to an in vitro molecular directed evolution method for reshaping antibody, which integrates ribosome displaying technology with DNA reorganization technology by designing reshaped antibody molecules, thus directly obtaining the extracorporal molecules of the single-chain antibody reshaped orientation.
Description
Technical field
The present invention relates to a kind of external molecular orientation evolvement method that antibody changes shape that is used for, more specifically, the present invention relates to by design reshaping antibody molecule, ribosomal display technology and DNA shuffling technology are combined, the antibody that direct acquisition changes the shape single-chain antibody on the basis of mouse source single-chain antibody changes the external molecular orientation evolvement method of shape.The present invention also provides the aminoacid sequence and the coding nucleotide sequence thereof of an anti-4-1BB reshaping antibody that obtains with this method, the host cell that contains the carrier of this nucleotide sequence and contain these carriers.
Background technology
Compare with polyclonal antibody, monoclonal antibody has good specificity and the avidity of Geng Gao; Can carry out repeatable mass production; In application, be easier to carry out stdn and quantitative work, therefore be widely used in fields such as medical diagnosis on disease and treatment, scientific researches.Yet in application process, during in particular for disease treatment, the mouse resource monoclonal antibody is as xenobiotic, enters the immune response that will evoke body behind the human body: HAMA (human antimouse antibody reaction).The HAMA reaction can be quickened the removing speed of antibody from blood, influences result of treatment; The IgE antibody that the HAMA reaction produces can cause the allergy of body; Because the transformation period of mouse resource monoclonal antibody in the recycle system is shorter, needs the duplicate injection medication.
The fundamental way that solves the mouse source property problem of monoclonal antibody is the preparation human monoclonal antibody.But,, be difficult to obtain people's hybridoma owing to following several respects reason.At first, there is not suitable human myeloma cell (in the culturing process that goes down to posterity for a long time, chromosome elimination not taking place) to be used for cytogamy; Secondly, because the consideration of ethics aspect, most of antigens can not be used for human immunity; At last, even some antigen allows to carry out human immunity, be difficult to obtain human spleen cell, and lymph-node cell is not the best source of human B cell.By making up the human antibody storehouse, adopt suitable triage techniques therefrom " to angle " then and get at certain antigenic human antibody, be considered to another milestone of antibody engineering development.Because the structure in human antibody storehouse and triage techniques are not also promoted fully, the also not widespread use of antibody that utilizes this approach to obtain.Adopt transgenic technology, groups of people's antibody gene is changed in the mouse body, adopt hybridoma technology to prepare human monoclonal antibodies then.This experimental considerations only limits to conceptual phase at present.
Another approach that solves monoclonal antibody mouse source property is " antibody humanization ", promptly replaces the part fragment of mouse resource monoclonal antibody, or indivedual amino-acid residue, make its on aminoacid sequence and structure more near people's antibody.This approach has made full use of the affluent resources of existing mouse resource monoclonal antibody, therefore is subjected to generally paying attention to.
Because the structure and the primary sequence of antibody determine it to evoke the ability of body rejection, in the specificity and avidity that keep antibody, the partial sequence of mouse source antibody is replaced with the sequence of human antibody, promptly can reach antibody humanization's purpose.
Along with enriching constantly of protein molecular design means and deepening continuously of the understanding of the structure of antagonist, function, antibody humanization's strategy has experienced a series of evolution process.Initial people are entrenched togather the variable region of mouse source antibody and the constant region of human antibody, have prepared first-generation humanized antibody: chimeric antibody (chimeric antibody).Subsequently, people recognize that each variable region (VH or VL) can also be divided into 3 hypervariable regions (being CDRs) and 3 FR districts, the CDR district at antigen aspect specificity between the antibody combines, play main effect, wherein the effect of CDR3 is more crucial, therefore when making up single-chain antibody or single domain antibody, the CDR district of mouse source antibody and the FR district of human antibody are entrenched togather, make up s-generation humanized antibody: CDR grafted antibody (CDR-graftingantibody).Deepening continuously of the research of antibody structure and function causes it is found that some key amino acid residue participation antigen in FR district, the interaction between the antibody.Therefore after carrying out the transplanting of CDR district, also need keep the amino-acid residue in mouse source in some position, thereby make up third generation humanized antibody: " changing shape " antibody (reshaping antibody) in the FR district.The selection of these key amino acid residues is the keys that obtain the high reactivity reshaping antibody.
Evidence suggests, compare that the HAMA reaction that chimeric antibody causes reduces significantly with mouse source antibody.But,, also do not have the humanization degree of experiment show grafted antibody and reshaping antibody at present owing to the restriction of experimental technique.
It is general through following step that antibody changes shape: at first determine the transplant recipient antibody sequence.Usually adopt the way of homology search, seek and mouse resource monoclonal antibody homologous human antibody sequence the most from genebank or existing human antibody sequence storehouse (as Kabat sequence library, V-base etc.), as transplant recipient.Secondly, after carrying out the CDR transplanting,, determine the key amino acid residue (promptly influencing the FR district residue of affinity of antibody) in the antibody FR district, mouse source, and in reshaping antibody, kept according to existing experimental results such as antibody structure or rite-directed mutagenesises.At last,, make up reshaping antibody, and the mode of employing prokaryotic expression is verified the specificity and the avidity of reshaping antibody according to the above-mentioned shape scheme that changes.
Successfully carried out the shape that changes of several antibody according to above-mentioned strategy.Because operation is more loaded down with trivial details, especially need to optimize repeatedly and adjust crucial FR district amino-acid residue, so the someone proposes to adopt the orthogenesis strategy to carry out antibody to change shape on this basis.People such as Baca M adopt the method for rite-directed mutagenesis to introduce random mutation in these positions after determining a series of candidate's key amino acid residues, adopt the technology of phage display then, therefrom screen the reshaping antibody of high-affinity.Barbas CF 3
RdThen adopted another strategy Deng the people, on the basis of existing mouse resource monoclonal antibody, make up genetic engineering antibody Fab, people antibody VH and VL gene then increase from the human peripheral blood cell respectively, make up people's antibody VH storehouse and VL storehouse respectively, further priority is the VH gene and the VL gene of murine antibody fixedly, successively with people's antibody VL storehouse and the combination of VH storehouse, carry out directed screening (guidedselection), antibody sequence wholly replace in mouse source is a human antibody sequence the most at last, keep original specificity, improve avidity or remain unchanged.Adopt these two kinds of strategies all successfully to carry out the shape that changes of antibody.
4-1BB is the auxilliary stimulating factor of a kind of induction type T cell, is expressed in the T cell surface of inducing (as anti-cd 3 antibodies, ConA, PMA, PHA, ionomycin etc.) through activator.The 4-1BB molecule contains the motif that is rich in halfcystine, therefore belongs to NGFR/TNFR (trk C/Tumor Necrosis Factor Receptors) superfamily.This family member also comprises NGFR, TNFR-I, TNF-II, CD30, CD27, OX40, CD40, FAS/APO-1 etc.Bringing into play very crucial effect in auxilliary stimulus signal cellular immunization of 4-1BB and the humoral immunization.Early stage at t cell activation, auxilliary stimulus signal molecule such as CD28, LFA-1, LFA-2 participates in T cell activation, the expression of inducing 4-1BB, CTLA4 simultaneously.The shared part B7 of CTLA4 and CD28.Because the avidity of CTLA4 and B7 is higher, and both interact to the T cell provides the inhibition signal, so the auxilliary stimulus signal of CD28 can not be brought into play the effect of continuous activation to the T cell after activating; At this moment the auxilliary stimulating factor of induction type such as 4-1BB and its ligand interaction continue as the T cell activation signals are provided.Also show on evidence: 4-1BB can adopt the mode that does not rely on CD28 to bring into play auxilliary activation, the activating T cell of stimulating.The activatory helper T cell is by secrete cytokines, as IL-2, IL-4, IFN-γ, etc. regulate the propagation and the differentiation of T cell and B cell, regulate cellular immunization and humoral immunization; Activatory CTL cell will be directly to target cell (as tumour cell or virus infected cell etc.) performance lethal effect.In sum, the effect characteristics of the auxilliary stimulus signal of 4-1BB are long-term efficient activating T cell, are bringing into play very crucial effect in cellular immunization and humoral immunization process.(reference: Schellekens H.Immolunogenicity of therapeuticproteins:clinical implications and future prospects.Clin Ther.2002 Nov; 24 (11): 1720-40; Discussion 1719.2.Huston JS, George AJ.Engineeredantibodies take center stage.Hum Antibodies.2001; 10 (3-4): 127-42.3.DillmanRO.The history and rationale for monoclonal antibodies in the treatment ofhematologic malignancy.Curr Pharm Biotechnol.2001 Dec; 2 (4): 293-300.4.Clark M.Antibody humanization:a case of the ' Emperor ' s new clothes '? Immolunol Today.2000 Aug; 21 (8): 397-402.5.Morea V, Lesk AM, Tramontano A.Antibody modeling:implications for engineering and design.Methods.2000 Mar; 20 (3): 267-79.6.Klingbeil C, Hsu D H.Pharmacology andsafety assessment of humanized monoclonal antibodies for therapeuticuse.Toxicol Pathol.1999 Jan-Feb; 27 (1): 1-3.7.Baca M, Presta LG, O ' ConnorSJ, Wells JA.Antibody humanization using monovalent phage display.J BiolChem 1997 Apr 18; 272 (16): 10678-84.Steinberger P, Sutton JK, Rader C, EliaM.Barbas CF 3rd.Generation and characterization of a recombinant humanCCR5-specific antibody.A phage display approach for rabbit antibodyhumanization.J Biol Chem.2000 Nov 17; 275 (46): 36073-8.8.Rader C, RitterG, Nathan S, Elia M, Gout I, Jungbluth AA, Cohen LS, Welt S, Old LJ, BarbasCF 3rd.The rabbit antibody repertoire as a novel source for the generation oftherapeutic human antibodies.J Biol Chem.2000 May 5; 275 (18): 13668-76.9.Rader C, Cheresh DA, Barbas CF 3rd.A phage display approach for rapidantibody humanization:designed combinatorial V gene libraries.Proc NatlAcad Sci U S is Jul 21 A.1998; 95 (15): 8910-5.10.Baca M, Presta LG, O ' ConnorSJ, Wells JA.Antibody humanization using monovalent phage display.J BiolChem.1997 Apr 18; 272 (16): 10678-84.11.Salih HR, Kiener PA, Nussler be ligand--just another costimulating molecule V.4-1BB? Int J Clin Pharmacol Ther.2002 Aug; 40 (8): 348-53.12.Kwon B, Lee HW, Kwon BS.New insights intothe role of 4-1BB in immolune responses:beyond CD8+T cells.TrendsImmolunol.2002 Aug; 23 (8): 378-80.13.Sica G, Chen L.Modulation of theimmolune response through 4-1BB.Adv Exp Med Biol.2000; 465:355-62.Review.No abstract available.14.Tan JT, Whitmire JK, Ahmed R, Pearson TC, Larsen CP.4-1BB ligand, a member of the TNF family, is important for thegeneration of antiviral CD8 T cell responses.J Immolunol.1999 Nov1; 163 (9): 4859-68.15.Watts TH, DeBenedette MA.T cell co-stimulatorymolecules other than CD28.Curr Opin Immolunol.1999 Jun; 11 (3): 286-93.16.Vinay DS, Kwon BS.Role of 4-1BB in immolune responses.SeminImmolunol.1998 Dec; 10 (6): 481-9.17.Hurtado JC, Kim SH, Pollok KE, LeeZH, Kwon BS.Potential role of 4-1BB in T cell activation.Comparison withthe costimulatory molecule CD28.J Immolunol.1995 Oct 1; 155 (7): 3360-7.18.Zhou Z, Kim S, Hurtado J, Lee ZH, Kim KK, Pollok KE, Kwon BS.Characterization of human homologue of 4-1BB and its ligand.ImmolunolLett.1995 Feb; 45 (1-2): 67-73.19.Alderson MR, Smith CA, Tough TW, Davis-Smith T, Armitage RJ, Falk B, Roux E, Baker E, Sutherland GR, Din WS.Molecular and biological characterization of human 4-1BB and its ligand.EurJ Immolunol.1994 Sep; 24 (9): 2219-27.20.Schwarz H, Tuckwell J, Lotz M.Areceptor induced by lymphocyte activation (ILA): a new member of the humanNGFR/TNFR family.Gene.1993 Dec 8; 134 (2): 295-8.21.Goodwin RG, DinWS, Davis-Smith T, Anderson DM, Gimpel SD, Sato TA, Maliszewski CR, Brannan CI, Copeland NG, Jenkins NA, et al.Molecular cloning of a ligandfor the inducible T cell gene 4-1BB:a member of an emerging family ofcytokines with homology to tumor necrosis factor.Eur J Immolunol.1993Oct; 23 (10): 2631-41.22.Pollok KE, Kim YJ, Zhou Z, Hurtado J, Kim KK, Pickard RT, Kwon BS.Inducible T cell antigen 4-1BB.Analysis of expressionand function.J Immolunol.1993 Feb 1; 150 (3): 771-81.23.Kwon BS, Weissman SM.cDNA sequences of two inducible T-cell genes.Proc NatlAcad Sci U S is Mar A.1989; 86 (6): 1963-7).
Summary of the invention
The present invention is on the basis of above-mentioned various strategies, has set up the distinctive external molecular orientation evolvement strategy of a tackling, is used for antibody and changes shape.At first, in Kabat antibody variable region sequence library, carry out the homology search, determine that the similar human antibody sequence of sequence height is as the transplant recipient sequence.Transplant recipient sequence and mouse source antibody sequence are carried out the subgroup classification in Kabat antibody variable region sequence library, determine subgroup consensus sequence and high conservative site.After carrying out the CDR transplanting, be retained in the amino-acid residue in FR district consistent between mouse source antibody sequence, mouse source subgroup consensus sequence, transplant recipient sequence and the people source subgroup consensus sequence thereof.Inconsistent site is accepted or rejected according to conservative property.Site, site " degeneracy " mouse source amino-acid residue and the people source amino-acid residue that can't accept or reject are designed to change shape VH storehouse respectively and change shape VL storehouse.Between is designed to change the shape single-chain antibody library after adding one section connection peptides (GGGGSGGGGSGGGGS).Usually amino acid " degeneracy " site reaches about 30, serve as interpreter into dna level change the shape single-chain antibody library after, base " degeneracy " site reaches about 40, so this changes, and the recombinant chou number is about 2 in the shape single-chain antibody library
30-2
40, promptly 10
9-10
12So big storage capacity has surpassed the limit of phage display, therefore adopt overlapping PCR and DNA shuffling technique construction finish above-mentioned change the shape single-chain antibody library after, we adopt the in-vitro screening technology: ribosomal display, screening changes the shape single-chain antibody.Use this strategy, we successfully carry out the shape that changes of anti-4-1BB single-chain antibody.
This strategy and structure are different for the antibody on basis changes the shape strategy, can screen reshaping antibody from a reshaping antibody storehouse of being made up of the mass mutation body.With adopt body such as phage display in the body of triage techniques the molecular orientation evolvement strategy compare, the whole process of this strategy is carried out external fully, need not pass through the step that bacterium transforms, easy and simple to handle, quick, be particularly suited for carrying out large vol reshaping antibody storehouse (〉=10
14) screening.This strategy has suitable originality, changes in the shape at antibody to be with a wide range of applications.
Summary of the invention
One aspect of the present invention provides a kind of external molecular orientation evolvement method that antibody changes shape that is used for, and comprises the following steps:
(1) determines to determine the species specificity and the individual specificity of antibody sequence the position of FR district key amino acid residue, and pass through the mode of degeneracy key amino acid residue in the conservative property on evolving according to antibody sequence, be designed to change shape single-chain antibody library antibody library;
(2) make up elementary reshaping antibody storehouse by synthetic oligonucleotide fragment of degeneracy and overlapping pcr, and adopt recombinate at random degeneracy site and introduce random mutation of DNA shuffling technology, form secondary reshaping antibody storehouse; With
(3) method by PCR makes up the ribosomal display template, carries out the ribosomal display screening, realizes molecular orientation evolvement.
Another aspect of the present invention provides and is used for the external molecular orientation evolvement method that anti-4-1BB antibody changes shape, comprises the following steps:
(1) determines the species specificity and the individual specificity of antibody sequence in the conservative property on evolving according to antibody sequence, determine the position of FR district key amino acid residue, and the mode by degeneracy key amino acid residue, be designed to anti-4-1BB and change shape single-chain antibody library antibody library;
(2) make up elementary reshaping antibody storehouse by synthetic oligonucleotide fragment of degeneracy and overlapping pcr, and adopt recombinate at random degeneracy site and introduce random mutation of DNA shuffling technology, form secondary reshaping antibody storehouse; With
(3) method by PCR makes up the ribosomal display template, carries out the ribosomal display screening, realizes molecular orientation evolvement, obtains anti-4-1BB and changes the shape single-chain antibody.
Another aspect of the present invention provides aminoacid sequence and the coding nucleotide sequence thereof that the anti-4-1BB that is adapted at expression in escherichia coli that uses aforesaid method to make up changes the shape single-chain antibody.
Another aspect of the present invention provides a kind of carrier that anti-4-1BB changes the shape single-chain antibody that is used to express, and it contains above-mentioned nucleotide sequence.Preferably, it is 4-1BB-pFUW802.
Another aspect of the present invention provides a kind of above-mentioned carrier that contains, and preferably, contains the e. coli host cell of carrier 4-1BB-pFUW802.
In addition, it is pointed out that aspect and creative beneficial effect that other has substantive distinguishing features of the present invention are understandable to those skilled in the art on the basis of the application's contextual disclosure.
Description of drawings
Fig. 1. external molecular orientation evolvement strategy is used for the experiment route that anti-4-1BB single-chain antibody changes shape
Fig. 2-1. change design of the anti-41BB VH of shape,
Fig. 2-2. change design of the anti-41BB VL of shape,
Wherein MSUBV-K HSUBIII MSUBIIB HSUBI: the subgroup consensus sequence; M4B4VL M4B4VH: mouse source light chain of antibody and sequence of heavy chain; RE4B4VL and RE4B4VH: reshaping antibody light chain and sequence of heavy chain, wherein also Sorted list is the merger sequence; Shade sequence: subgroup highly conserved sequence; 000001,000040 and 000760:VH candidate transplant recipient sequence; 004983:VL candidate transplant recipient sequence.
Fig. 3. change the Nucleotide and the aminoacid sequence of the anti-4-1BB single-chain antibody library of shape, the parallel base of shade is the degeneracy site.
Fig. 4. overlapping PCR makes up anti-4-1BB antibody primary antibody storehouse schema.
Fig. 5. agarose electrophoresis is monitored the process that overlapping PCR makes up the elementary reshaping antibody of anti-4-1BB storehouse, wherein A: each PCR product of step 3. gained.Swimming lane 1-4 is corresponding reaction product I, II, III, IV respectively.Swimming lane 5 is the DL2000 molecular weight standard, from top to bottom is followed successively by 100bp, 250bp, 500bp, 750bp, 1000bp, 2000bp; B: each PCR product of step 4 gained.Swimming lane 1,2 is corresponding reaction product VH part and VL part respectively, and swimming lane 3 is the DL2000 molecular weight standard; C: step 5 gained PCR product.Swimming lane 1 is the PCR product, the elementary anti-4-1BB single-chain antibody library of shape that changes, and swimming lane 2 is the DL2000 molecular weight standard.
Fig. 6. the process in the secondary reshaping antibody of DNA shuffling technique construction storehouse is adopted in the agarose electrophoresis monitoring, and wherein the A:DNaseI enzyme is cut the result of primary antibody storehouse dna fragmentation.Swimming lane 1-4 is followed successively by the result that enzyme is cut 3min, 2min, 1min, 30sec.Swimming lane 5 is the DL2000 molecular weight standard; B: the evaluation that changes shape secondary antibodies storehouse dna fragmentation that obtains behind process self extension and the PCR.Swimming lane 1 is the DL2000 molecular weight standard, and swimming lane 2 changes shape secondary antibodies storehouse dna fragmentation for total length.
The ribosomal display template sketch of Fig. 7-1..
Ribosomal display element-1:T7 the element of Fig. 7-2. (introducing T7 promotor, 5 ' neck ring structure and ribosome bind site).
Ribosomal display element-2:Spacer the element of Fig. 7-3. (introducing spacer and 3 ' neck ring structure).
Fig. 8-1.PCR makes up the ribosomal display template, and wherein swimming lane 1 is a total length ribosomal display template, and swimming lane 2 is the DL2000 molecular weight standard.
Fig. 8-2. agarose electrophoresis is identified the result of in-vitro transcription, and wherein swimming lane 1 is the RT-PCR product; Swimming lane 2 is the DL2000 molecular weight standard.
Fig. 8-3. agarose electrophoresis is identified the result of RT-PCR, and wherein swimming lane 1 is the RT-PCR product; Swimming lane 2 is the DL2000 molecular weight standard.
Fig. 8-4.Western-blotting identifies external translation product, and wherein 36KD is complete external translation product; 22.5KD be intestinal bacteria endogenous biotinylated protein.
Fig. 9 .pFUW802 plasmid sketch.
It is active that Figure 10 .ELISA detects the combination that changes the anti-4-1BB antibody of shape, wherein, (comprises the empty carrier contrast) for three results of each clone, the measurement result when first cylindricality is represented bag by 1 μ g/ml4-1BB; Measurement result when second cylindricality representative do not add any antigen (4-1BB); Article three, cylindricality is represented the difference of preceding two measuring results.Therefore the numerical value of the 3rd cylindricality is represented the relative binding ability of this reshaping antibody to 4-1BB.
The sequence alignment result in the VH district of Figure 11-1.Re-3,
The sequence alignment result in the VL district of Figure 11-2.Re-3.
The anti-4-1BB of Figure 11-3 changes the analytical results in shape single-chain antibody (re-3) mutational site
The structure comparison result in the VH district of Figure 12 .Re-3, wherein the structure comparison result of A:re-3 and m4b4-1 scFv; The structure of B:m4b4-1 scFv, with re-3 obviously do not match the district mark; The enlarged view of C-E:region-1, region-2, region-3.
Detailed Description Of The Invention
Carrying out antibody when changing shape, need take all factors into consideration following several respects factor: avidity, specificity and immunogenicity.The specificity of antibody is commonly considered as being determined by the CDR district.And the CDR district is the principal element of decision affinity of antibody, and the FR district provides support skeleton for the CDR district, the avidity of remote effect antibody.The immunogenicity of antibody is meant it as xenobiotic, enter human body after, evoke the character of organism immune response, as evoke the ability of body HAMA reaction.The species specificity of antibody sequence and individual specificity are directly related with its immunogenicity.In Kabat antibody sequence handbook, mouse source antibody sequence and human antibody sequence are divided into different subgroup (subgroup) respectively, the consensus sequence of each subgroup is an amino-acid residue the most conservative in this subgroup, is representing the species specificity of antibody.Wherein the conservative property of some amino acid (as most of CDR district's amino-acid residue and part FR district amino-acid residue) is very low, represents the individual specificity of antibody.These amino-acid residues might be the result of antibody sequence rearrangement or somatic mutation, and are relevant with the avidity and the specificity of antibody.Therefore these to represent antibody individual specificity's FR district amino-acid residue be to carry out antibody when changing shape, the position that need adjust and optimize.
Based on the above-mentioned theory basis, the invention provides a whole set of and be used for antibody and change the shape New Policy.Particular content is as follows:
(1) be template with the variable region of heavy chain (VH) of mouse source antibody and the aminoacid sequence of variable region of light chain (VL), adopt the method for homology search, from existing immunoglobulin sequences storehouse (Kabatdatabase:http: //www.hgmp.mrc.ac.Uk/Bioinformatics/Databases/kabatn-help. html and http://www.hgmp.mrc.ac.uk/Bioinformatics/Databases/kabatp-help. html; V-base:http: //www.mrc-cpe.cam.ac.uk/vbase-ok.php? menu=901) seek the CDR transplant recipient in.After having determined the higher candidate's transplant recipient antibody sequence of homology, every sequence is all carried out the subgroup classification in Kabat antibody sequence storehouse, and definite subgroup consensus sequence.Usually these transplant recipient sequences all belong to same subgroup.Simultaneously mouse source antibody sequence is also carried out the subgroup classification in Kabat antibody sequence storehouse, and definite subgroup consensus sequence.
(2) mouse source antibody sequence and subgroup consensus sequence, candidate's transplant recipient antibody sequence and subgroup consensus sequence thereof are compared (alignment) consistent sequence in the CDR district that keeps mouse source antibody and the FR district.We think that mouse source antibody subgroup consensus sequence and transplant recipient antibody subgroup consensus sequence are represented mouse kind conservative property and people's kind conservative property to a certain extent respectively.If the amino-acid residue of mouse source antibody sequence occurs in transplant recipient antibody subgroup consensus sequence corresponding position, and belong to high conservative (occurrence probability is greater than 90%), then this amino-acid residue may kept aspect the characteristic structure of antibody (as Ig fold), significant, in the sequence of reshaping antibody, must keep.Other amino-acid residue might be the result of somatic mutation, represent the individual specificity of this antibody, might be relevant with the specificity and the avidity of antibody itself, so in the sequence of reshaping antibody, with the corresponding amino-acid residue degeneracy of mouse source amino-acid residue and transplant recipient antibody subgroup consensus sequence.So far, VH and VL reshaping antibody storehouse are finished in design.
(3) between one section repeated connection peptides of interpolation (GGGGSGGGGSGGGGS) is designed to change the shape single-chain antibody library.Because on amino acid levels, this changes the shape single-chain antibody library and co-exists in " degeneracy " site about 30.
(4) according to the password sublist of intestinal bacteria hobby, this is changed the shape single-chain antibody library translate into dna sequence dna.Owing to select degenerated code for use, on dna level, have the merger site about 40 approximately.If the free reorganization in these sites will produce 2
40(about 10
12) individual recombinant chou.And carry out single domain antibody change shape the time, the degeneracy site reduces by half.The recombinant chou number in single domain reshaping antibody storehouse mostly is 10 most
6, adopt display technique of bacteriophage just can finish screening, this process is a molecular orientation evolvement in the body.And the recombinant chou number in single-chain antibody reshaping antibody storehouse can reach 10 at most
12, therefore should select ribosomal display as the screening means, carry out external molecular orientation evolvement.
(5) according to the requirement of overlapping PCR, will change shape single-chain antibody library (DNA) " fractionation " and become the following single strain oligonucleotide fragment of 60 Nucleotide, further adopt overlapping pcr to make up the elementary shape single-chain antibody library that changes.
(6) because some single strain oligonucleotide fragment contains a more than degeneracy site, therefore, recombinate at random, make up the secondary shape single-chain antibody library that changes by adopting the DNA shuffling technology.
(7) adopt a step PCR reaction, introduce the ribosomal display element, as T7 promotor (Promoter), ribosome bind site (RBS), spaced interval district (Spacer), 5 ' neck ring (Stem loop) and 3 ' Stem loop etc.Carry out ribosomal display.
(8) take turns ribosomal display screening through 3 after, screening product (being the RT-PCR product) directly is connected into secreted expression carrier pFUW802 through endonuclease reaction, transformed into escherichia coli HB2151 (available from Pharmacia company), carry out secretion type expression and determination of activity, identify to have the higher active clone that combines with antigen.Through after the sequence verification, obtain changing the shape single-chain antibody.
Change the shape strategy with existing antibody and compare, the external molecular orientation evolvement strategy that the present invention proposes has following characteristics:
1.FR the characteristics of definite mode of the key amino acid residue in district: other the shape strategy that changes all is to determine the key amino acid residue according to the experimental result of antibody structure and rite-directed mutagenesis, and confirmable key amino acid residue number is less.According to mentality of designing of the present invention, determine the species specificity and the individual specificity of antibody sequence according to antibody sequence in the conservative property on evolving, determine the position of key amino acid residue.
2. make up the characteristics of the mode in reshaping antibody storehouse: make up elementary reshaping antibody storehouse by synthetic oligonucleotide fragment of degeneracy and overlapping pcr, and adopt recombinate at random degeneracy site and introduce random mutation of DNA shuffling technology, form secondary reshaping antibody storehouse.
3. the characteristics of screening mode: compare with screening mode in the body (as display technique of bacteriophage), the ribosomal display technology does not need to transform fully at manipulation in vitro, can carry out big storage capacity screening.Determine the scheme of key amino acid residue position and degeneracy number of loci according to the present invention, carry out single-chain antibody change shape the time, on amino acid levels, co-exist in 15-30 " merger " site usually.When " translation " becomes dna sequence dna, owing to select degenerate code for use, in the merger site that exists approximately on the dna level about 40.If the free reorganization in these sites will produce 2
40(about 10
12) individual recombinant chou.The recombinant chou number in single-chain antibody reshaping antibody storehouse can reach 10 at most
14, display technique of bacteriophage can't satisfy this requirement, therefore can only select ribosomal display as the screening means.
4. DNA shuffling is combined with ribosomal display, when carrying out external molecular orientation evolvement screening reshaping antibody, without the step that transforms, therefore operation is more easy.Adopt the autonomous intestinal bacteria secreted expression carrier (pFUW802) that makes up, carry out the secretion type expression and the evaluation of positive colony.
The antibody that can adopt this strategy to change shape comprises, Fab (fragment of antigenbinding), single-chain antibody (scFv:single chain antibody), single domain antibody (single dimainantibody).
The present invention adopts above-mentioned external molecular orientation evolvement strategy successfully to carry out changing shape, has obtained to have higherly to change shape single-chain antibody (re-3) in conjunction with active anti-4-1BB.This antibody has following aminoacid sequence:
1?QVQLVQSGAE?VVKPGASVKV?SCKASGYTFT?SYWMHWVNQR?PGQGLEWMGE
51?INPGNGHTNY?NEKFKSSVTI?TADTSSSTAY?MQLSPLSSED?SAVYYCARSF
101?TTACAFAYWG?QGTLVTVSST?SGGGGSGGGS?GGGGSSRDIV?MTQSPATLSV
151?TPGDRATLSC?RASQTISDYL?HWYQQKSHES?PRLLIKYASQ?SISGIPNRFS
201?GSGSGSDFTL?TINSVEPEDF?AVYYCQDGHS?FPPTFGGGTK?LEIK(SEQ?ID?NO.：2)。
Anti-4-1BB of the present invention changes shape single-chain antibody (re-3) and has following nucleotide sequence:
1 CAG?GTT?CAG?CTG?GTG?CAA?TCG?GGT?GCG?GAA?GTG?GTG?AAA?CCG?GGT
46 GCA?TCT?GTT?AAA?GTG?TCT?TGC?AAA?GCG?AGC?GGT?TAC?ACC?TTC?ACC
91 TCT?TAC?TGG?ATG?CAC?TGG?GTT?AAT?CAG?CGT?CCG?GGT?CAG?GGT?CTG
136 GAA?TGG?ATG?GGT?GAA?ATC?AAC?CCG?GGT?AAC?GGC?CAC?ACC?AAC?TAC
181 AAC?GAA?AAA?TTC?AAA?AGC?AGT?GTG?ACC?ATT?ACC?GCG?GAC?ACG?TCT
226 AGC?AGC?ACC?GCG?TAC?ATG?CAG?CTG?AGC?CCC?CTG?AGC?AGC?GAA?GAC
271 AGC?GCT?GTT?TAC?TAC?TGC?GCA?CGT?TCT?TTC?ACC?ACC?GCT?TGT?GCG
316 TTC?GCC?TAC?TGG?GGT?CAG?GGC?ACC?CTG?GTG?ACC?GTT?TCC?TCC?ACT
361 AGT?GGA?GGC?GGT?GGG?AGC?GGC?GGT?GGT?TCT?GGG?GGT?GGC?GGC?AGC
406 TCT?AGA?GAC?ATC?GTT?ATG?ACC?CAG?AGC?CCG?GCG?ACC?CTG?AGC?GTG
451 ACC?CCG?GGT?GAT?CGT?GCG?ACC?CTG?TCT?TGC?CGT?GCG?TCT?CAG?ACC
496 ATC?AGC?GAC?TAC?CTG?CAC?TGG?TAC?CAA?CAG?AAA?AGC?CAC?GAA?TCC
541 CCG?CGT?CTG?CTG?ATC?AAA?TAC?GCA?TCT?CAG?TCT?ATC?AGC?GGT?ATC
586 CCG?AAC?CGT?TTC?TCT?GGT?TCC?GGT?AGC?GGT?TCT?GAC?TTC?ACC?CTG
631 ACC?ATC?AAC?AGC?GTG?GAA?CCG?GAA?GAC?TTT?GCC?GTG?TAC?TAC?TGC
676 CAG?GAC?GGT?CAC?TCT?TTC?CCG?CCG?ACC?TTC?GGA?GGT?GGT?ACC?AAA
721 CTG?GAA?ATC?AAA(SEQ?ID?NO.：1)。
The present invention also provides and can be used for the expression vector that containing of evaluation and screening product anti-4-1BB of the present invention changes the nucleotide sequence of shape single-chain antibody: re-3.Preferably, this carrier is for being pFUW802, and it possesses following advantage: have suitable multiple clone site, be used to express single-chain antibody; This plasmid is fit to carry out the pericentral siphon solinocrine expresses, and pericentral siphon chamber extract can be directly used in ELISA and detect; This plasmid contains the c-myc detection label, and convenient antibody (as 9E10) with anti-c-myc label carries out ELISA and detects.
The present invention also provides the host cell that contains above-mentioned carrier, and described host cell is preferably intestinal bacteria.
Below in conjunction with specific embodiment, further illustrate the present invention.Should be understood that these embodiment just in order to demonstrate the invention, but not limit the scope of the invention by any way.
Embodiment:
According to the evolution conservative of antibody structure and aminoacid sequence, the design degeneracy changes the anti-4-1BB single-chain antibody library of shape, with ribosomal display technology and the combination of DNA shuffling technology, realizes external molecular orientation evolvement then.Screening changes the anti-4-1BB single-chain antibody of shape from change the shape single-chain antibody library.The experiment route of this molecular orientation evolvement method is seen Fig. 1.
1. the elementary molecular designing that changes the anti-4-1BB single-chain antibody library of shape
(1) with document (Garni-Wagner BA, et al., 4-1BB is expressed onCD45RAhiROhi transitional T cell in humans.Cell Immunol.1996Apr 10; 169 (1): the 91-8.) aminoacid sequence (seeing Fig. 2 .1M4B4VH and Fig. 2 .2M4B4VL) of the variable region of heavy chain (VH) of Bao Dao the mouse-anti 4-1BB antibody with agonist activity (4b4-1 clone) and variable region of light chain (VL), method according to the homology search, (VH sees Fig. 2 .1:000001 to seek the highest human antibody sequence of homology degree respectively from Kabat sequence library and V-base storehouse, 000040,000760; VL sees Fig. 2 .2:004983) as candidate's transplant recipient sequence.Further former mouse source antibody sequence and candidate's antibody sequence are carried out subgroup and sort out in the Kabat sequence library, and determine that (VH sees Fig. 2 .1:HSUBIII for separately subgroup consensus sequence; VL sees Fig. 2 .2:HSUBI).In each subgroup, occurrence probability is that amino-acid residue more than 90% is decided to be high conservative residue (dash area among Fig. 2 .1 and Fig. 2 .2) in the FR district.
(2) carry out the CDR district and transplant, keep the CDR district of mouse-anti 4-1BB antibody (4b4-1), and between mouse source antibody sequence, mouse source subgroup consensus sequence, candidate's transplant recipient subgroup consensus sequence, on all four FR district amino-acid residue.Inconsistent amino acid sites between the three if the amino-acid residue of mouse source antibody is consistent with mouse source subgroup consensus sequence, and is the high conservative residue, then it is replaced by the corresponding amino-acid residue of candidate's transplant recipient subgroup consensus sequence.Otherwise keep this amino-acid residue or with the corresponding amino-acid residue degeneracy of itself and candidate's transplant recipient subgroup consensus sequence.So far, change the anti-4-1BB VH of shape (Fig. 2-1) and change the anti-4-1BB VL of shape (Fig. 2-2) design and finish.Both are coupled together promptly design with one section connection peptides finish the elementary anti-4-1BB single-chain antibody library of the shape (see figure 3) that changes.
(3) further, change the anti-4-1BB single-chain antibody library of shape (see figure 3) according to the genetic code (http://www.kazusa.or.jp/codon/) of intestinal bacteria deflection with what the reshaping antibody storehouse of this amino acid levels was converted to dna level.
(4) the anti-4-1BB single-chain antibody library of shape that changes with dna level splits into 24 oligonucleotide fragments, so that use overlapping pcr to be spliced into the elementary anti-4-1BB single-chain antibody library of the shape dna fragmentation that changes of total length.Because each single strain oligonucleotide fragment contains a more than degeneracy site, therefore need further to recombinate at random by the DNA shuffling technology, make up the secondary anti-4-1BB single-chain antibody library of shape that changes.Below for being used to splice the elementary oligonucleotide fragment that changes the anti-4-1BB single-chain antibody library of shape of total length, Nucleotide and previous Nucleotide degeneracy in the bracket.
1.5’-GGCCATGGACTACAAAGACCTC-3’；
2.5’-CAGCTGACCGTGAGGTCTTTGTAGTCCAT；
3.5’-CTCGAGCAGGTTCAGCTGC(G)A(T)GCAAC(T)CGGGTGCGGAAC(G)TGG(A)
T(A)GAAACCGG?GTGCATCTG-3’；
4.5’-TGAAGGTGTAACCGCTCGCTTTGCAAGACAG(C)TTTAACAGATGCAC
CCGGTTTC-3’；
5.5’-CGAGCGGTTACACCTTCAC(G)CTCTTACTGGATGCACTGGGTT-3’；
6.5’-CCTG?ACCCGGACGCTGT(A)T(C)T(G)AACCCAGTGCATCCAGTA-3’；
7.5’-AGCGTCCGGGTCAGGG(T)TCTGGAATGGATC(G)GGTGAAATCAACCCGGG
TAACGGCCAC-3’；
8.5’-GCTTTTGAA?TT?T?TTCGTTGTAGTTG?GTGTGGCCGTTACCCGGG-3’；
9.5’-
CGAAAAATTCAAAAGCA(C)A(G)A(T)GC(T)GACCC(A)TTACCGT(C)GGACAA(
C)GTCTC(G)CAGACCGTACA-3’；
10.5’-CAGGGAGCTCAGCTGCATGTA?CGCGGTGCTG-3’；
11.5’-GCAGCTGAGCCTGA(C)C(G)CAGCGAAGACAG(C)CGCTGTTTACTACTGCG
C-3’；
12.5’-
CCCAGTAGGCGAACGCACGAGCGGTGGTGAAAGAACGTGCGCAGTAGTAAA
CAGCG-3’；
13.5’-
GCGTTCGCCTACTGGGGTCAGGGCACCCTGGTGACCGTTTCCTCCACTAGTG
GAGGC-3’；
14.5’-
TAGAGCTACCGCCACCCCCAGAACCACCACCGCCGCTCCCACCGCCTCCACT
AGTGGAG-3’；
15.5’-GGTGGCGGAAGCTCTAGAGACATCGTTATGACCCAGAGCC-3’；
16.5’-
GACGCACGGCAAGACAGGC(G)TCA(G)CACGA(T)TCACCCGGGG(C)TCACGC
TCT(A)GGGTCGCCT(G)GGCTCTGGGTCATAAC-3’；
17.5’-
CCTGTCTTGCCGTGCGTCTCAGACCATCAGCGACTACCTGCACTGGTACCAA
CAGAAA-3’；
18.5’-TGATCAGCAGACGCGGGGA(C)TTC(G)GTGGCTTTTCTGTTGGTACCAGTG-
3’；
19.5’-CCCGCGTCTGCTGATCAAATACGCATCTCAGTCTATCAGCGGTATCCCG-3’；
20.5’-
GGGTGAAGTCAGAACCGCTACCGGAACCAGAGAAACGGC(T)T(C)CGGGATA
CCGCTGATAGA-3’；
21.5’-CGGTTCTGACTTCACCCTGAG(C)CATCAACAGCGTGGAACCGGAAGAC-3’；
22.5’-
GCGGGAAAGAGTGACCGTCCTGGCAGTAGTACACGC(G)CAAC(A)GTCTTCC
GGTTCCACGC-3’；
23.5’-CGGTCACTCTTTCCCGCCGACCTTCGGTGGTGGTACCAAA-3’；
24.5’-ACCGAATTCTTTGATTTCCAG(C)TTTGGTACCACCACCGAA-3’.
2. overlapping PCR makes up anti-4-1BB antibody primary antibody storehouse (Fig. 4 is seen in operating process):
Step 1:
Method: according to Fig. 4 fragment 1-24 is matched overlapping extension separately, do not add primer, reaction product ((1)-(12)) does not need to reclaim, and directly carries out next step reaction.
Mixture: fragment 1-24 is matched in twos each 1 μ l (10pmol) according to Fig. 4; 2 μ l, 10 * PCR damping fluid (500mM KCl, 50mM Tris pH 8.5,25mM Mg (Cl)
2Down together); 2 μ ldNTP (2mM dATP, dTTP, dCTP, dGTP) (available from the precious biotech company in Dalian, down together); 0.3 μ l Taq enzyme (1U) (available from the precious biotech company in Dalian, down together); Water 14 μ l.
Reaction conditions: 94 ℃ of pre-sex change 1min; 94 ℃ of sex change 30sec; 45 ℃ of annealing 30sec; 72 ℃ are extended 30sec; 10 circulations.
Step 2:
Method: according to Fig. 4 reaction product (2)-(11) are matched overlapping extension separately, do not add primer.Reaction product (A-E) does not need to reclaim, and directly carries out next step reaction.
Mixture: reaction product (2)-(11) are matched each 10 μ l according to Fig. 4.
Reaction conditions: 94 ℃ of pre-sex change 1min; 94 ℃ of sex change 30sec; 45 ℃ of annealing 30sec; 72 ℃ are extended 30sec; 10 circulations.
Step 3:
Method: reaction product (1), A, B, C, E, (12) are matched respectively according to Fig. 4, use reaction product D separately, add (the pairing of primer 1 and 6 correspondences (1) and A of separately little primer, the pairing of primer 7 and 14 corresponding B and C, primer 15 and 18 corresponding D, the pairing of primer 19 and 24 corresponding E and (12)), pcr amplification.Reaction product (I-IV) 1% agarose gel electrophoresis reclaims (sees Fig. 5-A).
Mixture: reaction product (1), A, B, C, E, (12) are matched each 1 μ l respectively according to Fig. 4; 2 μ l, 10 * PCR damping fluid; 2 μ l dNTP (2mM each); Each 1 μ l of primer, about 10pmol; 0.3 μ l Taq enzyme (1U); Water 12 μ l (or 13 μ l).
Reaction conditions: 94 ℃ of pre-sex change 1min; 94 ℃ of sex change 30sec; 45 ℃ of annealing 30sec; 72 ℃ are extended 30sec; 25 circulations.
Step 4: according to Fig. 4 reaction product I-IV is matched respectively, add primer (pairing of 1 and 14 corresponding I and II, the pairing of 15 and 24 corresponding III and IV) separately, pcr amplification.Reaction product (VH part and VL part) 1% agarose gel electrophoresis reclaims (sees Fig. 5-B).
Mixture: reaction product I-IV is matched each 1 μ l respectively according to Fig. 4; 2 μ l, 10 * PCR damping fluid; 2 μ l dNTP (2mM each); Each 1 μ l (10pmol) of primer; 0.3 μ l Taq enzyme (1U); Water 12 μ l.Reaction conditions: 94 ℃ of pre-sex change 1min; 94 ℃ of sex change 30sec; 45 ℃ of annealing 30sec; 72 ℃ are extended 30sec; 25 circulations.
Step 5: with reaction product VH part and VL part pairing, add primer 1 and 24, pcr amplification according to Fig. 4.Reaction product 1% agarose gel electrophoresis reclaims the 750bpDNA fragment, and the promptly elementary anti-4-1BB single-chain antibody library of shape that changes (is seen Fig. 5-C).
Mixture: each 1 μ l of reaction product VH part and reaction product VL part; 2 μ l, 10 * PCR damping fluid; 2 μ l dNTP (2mM each); Each 1 μ l (pmol) of primer, about 10pM; 0.3 μ l Taq enzyme (1U); Water 12 μ l.Reaction conditions: 94 ℃ of pre-sex change 1min; 94 ℃ of sex change 30sec; 45 ℃ of annealing 30sec; 72 ℃ are extended 1min; 25 circulations.
The 3:DNA shuffling technology makes up the secondary anti-4-1BB single-chain antibody library of shape that changes
(1) 2-5 μ g 750bp dna fragmentation is dissolved in the 20 μ l water, adds 2.5 μ l damping fluid I (1MTris-HCl pH7.5), 2.5 μ l damping fluid II (200mM MnCl
2)..15 ℃ of balance 5min.
(2) simultaneously 1 μ l RQI DNaseI (I type DNA enzyme) (available from Pu Luomaige company) is mixed 15 ℃ of balance 5min with 24 μ l water.
(3) above-mentioned two kinds of solution are mixed, in 30sec, 1min, 2min, 3min, get in the EP pipe of damping fluid III (50mM EDTA, 30% glycerine) that 10 μ l join the precooling of existing 5 μ l ice immediately respectively.
(4) (see that Fig. 6-A), the efficient glue of employing small pieces segment DNA reclaims the small segment that test kits (available from Shanghai Hua Shun company) reclaim 50-100bp, is dissolved in the 10 μ l water with the evaluation of 2% agarose gel electrophoresis at last.
(5) self PCR or do not have primer PCR: PCR reaction mixture: 5 μ l, 10 * PCR damping fluid; 5 μ l dNTP (2mM each); 2.5U pfu enzyme (available from Shanghai Bo Ya Bioisystech Co., Ltd); 10 μ l reclaim small segment; Water 29.5 μ l.PCR reaction conditions: 94 ℃ of pre-sex change 4min; 94 ℃ of sex change 30sec; 55 ℃ of annealing 1min; 72 ℃ are extended 1min 30sec; 30-40 circulation.It is more little to reclaim fragment, and annealing temperature is low more, and cycle number is many more.Need not reclaim.
(6) pcr amplification: pcr amplification: PCR reaction mixture: 2 μ l, 10 * PCR damping fluid; 2 μ ldNTP (2mM each); Primer 1 and 24 (with reference to Fig. 4) respectively adds 1 μ l (10pmol); 0.5 μ lpfu (2.5U); Last round of PCR product 1 μ l; Water 13 μ l.PCR reaction conditions: 94 ℃ of pre-sex change 4min; 94 ℃ of sex change 30sec; 58 ℃ of annealing 30sec, 72 ℃ are extended 1min, 20 circulations, last 72 ℃ are extended 2.5min.1% agarose gel electrophoresis reclaims near the 750bp specific fragment and (sees Fig. 6-B), be dissolved in 30 μ l ddH
2O, promptly secondary reshaping antibody storehouse.
4: adopt PCR method to make up ribosomal display template (sketch is seen Fig. 7-1)
Adopt round pcr, introduce the ribosomal display element: PCR reaction mixture: 2 μ l, 10 * PCR damping fluid; 2 μ l dNTP (2mM each); Primer T7-primer and T5te respectively add 1 μ l (10pmol); 0.5 μ l pfu enzyme (2.5U); (the preparation in advance of T7 and spacer element, sequence is seen Fig. 7-2 and Fig. 7-3, concrete sequence is from document: Hanes J, et al., Selecting and evolving functional proteins in vitro by ribosome display.Methods Enzymol.2000; 328:404-30.) each 1 μ l (about 10pmol); Secondary reshaping antibody storehouse 1 μ l; Water 11 μ l.PCR reaction conditions: 94 ℃ of pre-sex change 4min; 94 ℃ of sex change 30sec; 40 ℃ annealing 30sec, 8 circulations, then 58 ℃ annealing 30sec, 22 circulations; 72 ℃ are extended 2.5min.1% agarose gel electrophoresis is identified (seeing Fig. 8-1), reclaims 1, near the specific fragment the 000bp.The PCR product is directly used in in-vitro transcription.
T7-primer.
ATACGAAATTAATACGACTCACTATAGGGAGACCACAACGG；
T5te.CCGCACACCTTACTGGTGTGCGGATCACCAGTAGC。
5: in-vitro transcription
(1) remove adding equal-volume phenol-chloroform-primary isoamyl alcohol (25/24/1) in the RNase:PCR product, shake up back 12,000g, 4 ℃ are centrifugal 15 seconds; The water intaking phase adds the chloroform of 2 times of volumes, after shaking up once more 12, and 000g, 4 ℃ of centrifugal 15sec; The water intaking phase adds the 1mol NaCl of 1/10 volume and the dehydrated alcohol of 2 times of volumes, places 30min, 12,000g, 4 ℃ of centrifugal 30min for-20 ℃; 70% washing with alcohol is dissolved in after the drying in the no RNA enzyme water.
(2) in-vitro transcription: add following various components successively: 30 μ l, 5 * T7 RNA polymerase damping fluid (1MHEPES-KOH pH7.6; The 150mM magnesium acetate; The 10mM spermine; 0.2mM DTT); 60 μ l DTT (100mM) (dithiothreitol (DTT) is available from Sigma company); 120U RNasin (RNA enzyme inhibitors, down together) (available from the precious biotech company in Dalian); 20 μ l NTP (50mM) (available from the precious biotech company in Dalian); 1.5-3 μ g dna profiling; 300U T7 RNA polymerase (available from Pu Luomaige company); Water complements to 150 μ l.At 2 hr of 37 ℃ of water-baths, carry out the in-vitro transcription reaction.
(3) LiCl selective precipitation RNA: after transcription product placed cooled on ice, add the 6M LiCl of isopyknic ice precooling, behind the mixing, place 30min on ice gently; 16,000g, 4 ℃ of centrifugal 30min; Add 500 μ l, 70% washing with alcohol precipitation, need not be dry, adding 100 μ l does not have RNA enzyme water dissolution precipitation; Add the 1M NaCl of 1/10 volume and the dehydrated alcohol of 2 times of volumes ,-20 ℃ of placements are spent the night; 16,000g, 4 ℃ of centrifugal 30min; Add 500 μ l, 70% washing with alcohol precipitation, add no RNA enzyme water dissolution precipitation, and carry out external translation immediately.Otherwise directly precipitation is suspended in 70% ethanol, puts-70 ℃ or liquid nitrogen preservation.
(4) adopt 1% agarose gel electrophoresis to identify in-vitro transcription product (seeing Fig. 8-2)
6: external translation
(1) lavation buffer solution of preparation ice precooling: WBTH damping fluid (250mM Tris-HAc pH7.5,150mM NaCl, 50mM Mg (Ac)
2, 0.1%Tween-20 and 2.5mg/ml heparin)
(2) mix following component on ice: premixture (250mM Tris-HAc pH7.5, aminoacid mixture is (except that methionine(Met), every seed amino acid 1.75mM) 10mM ATP, 2.5mM GTP, 5mMcAMP, 150mM acetylphosphate, 2.5mg/ml E.coli tRNA, 0.1mg/ml folic acid, 7.5%PEG 8000): 22 μ l; Methionine(Met) (200mM): 1.1 μ l; Potassium glutamate (2M): 11 μ l; Mg (Ac)
2(100mM): 7.6 μ l; Anti-ssrA (200 μ M): 2 μ l; Eucaryon molecular chaperones PDI (44 μ M) (available from Sigma company): 1.5 μ l; S-30 extract (available from Pu Luomaige company) 40 μ l.Moisturizing to 100 μ l.
Remarks: intestinal bacteria have a 10S-RNA polypeptide marker system, and this system is that template translates one 10 peptide with 10S-RNA, and this 10 peptide can not contain the translation product of the mRNA of termination codon by mark, thereby the latter is discerned by the intracellular protein enzyme and degrade.Anti-ssrA and 10S-RNA complementation, can suppress with it is the translation process of template, thereby suppresses the effect of 10S-RNA polypeptide marker system.anti-ssrA(CTTAAGCACACCA?GTAAGGTGTGCGGTCAGGATATTC?ACCACAATCC?C)。
(3) add 10 μ g/10 μ l mRNA storehouses, behind the mixing, 37 ℃ of water-baths were placed 7 minutes gently.
(4) said mixture is mixed with 440 μ l WBTH, ice bath is placed behind the mixing gently, prepares to carry out affine screening.
7. the affine screening of liquid phase
(1) ice-cold WBT damping fluid is washed streptavidin-magnetic bead (available from Pu Luomaige company down together) 4 times, then with isopyknic WBT damping fluid (250mM Tris-HAc pH7.5,150mM NaCl, 50mM Mg (Ac)
2, 0.1%Tween-20) mix, preserve on ice.
(2) closed screening pipe: the screening pipe of 5ml is filled with 4% skim milk powder aqueous solution, and room temperature is reversed 1hr repeatedly, seals.Use PBS (137mM NaCl, 2.7mM KCl, Na then
2HPO
41.8mM KH
2PO
4) wash 3 times, fill with WBT, preserve on ice.
(3) the skim-milk solution of preparation lifeless matter element: with after 100 μ l streptavidin-magnetic beads mix, room temperature is reversed 1hr repeatedly with the sterilization skim milk powder aqueous solution of 1ml 12%.After removing streptavidin-magnetic bead, preserve on ice
(4) external translation product is mixed, shakes up gently with 4 times of volumes (200 μ l) WBTH.16,000g, 4 ℃ of centrifugal 5min remove insoluble composition, and 12% skim-milk solution of the lifeless matter element of supernatant and 50 μ l and a certain amount of biotinylation 4-1BB are (available from R﹠amp; D company) mixes, make the concentration of skim-milk reach 2%.Above-mentioned solution is transferred in the ready screening pipe, in icehouse, reversed repeatedly 1 hour.Make the abundant combination of antigen and antibody.
(5) add 100 μ l streptavidin-magnetic beads, continue to reverse repeatedly 10-15min on ice, capture antigen-antibody-rrna-mRNA mixture.
(6) wash 5 times with the WBT damping fluid of ice precooling, EB20 damping fluid (the 50mM Tris-HAc pH 7.5 that adds the precooling of 200 μ l ice, 150mM NaCl, 20mM EDTA 50 μ g/ml yeast tRNA (available from Sigma company), continue to reverse repeatedly 5min on ice, the big small subunit of rrna is separated, discharge mRNA.The mRNA liquid nitrogen that disintegrates down is preserved or is separated immediately.
8: separation and purification mRNA and RT-PCR
(1) the high purity mRNA purification kit purified mRNA of employing Roche company.Use the residual DNA of DNaseI (I type DNA enzyme) digestion to transcribe template in the purge process, to avoid interference RT-PCR reaction to next step.
(2) in the mRNA that elutes, add 2 μ l T5te (about 20pmol) primer, 70 ℃ of water-bath 10min immediately.Room temperature 10min then.
(3) prepare the synthetic premixture of cDNA article one chain simultaneously: 10 μ, 15 article one chains synthesize damping fluid (); 10 μ l dNTP (2mM each); 5 μ l DTT (100mM); 50U RNasin; 250Ustratascript reversed transcriptive enzyme (available from stratagene company).The cumulative volume of moisturizing to 27 μ l.The mRNA sample of handling well (about 23 μ l) is joined in the above-mentioned premixture, after 1hr is placed in 42 ℃ of water-baths, place 3min, make the reversed transcriptive enzyme inactivation for 75 ℃.
(4) synthetic second chain: PCR reaction mixture: 2 μ l, 10 * PCR damping fluid; 2 μ l dNTP (2mMeach); Primer P1 and P22 respectively add 1 μ l; 0.5 μ l Taq enzyme (2.5U); 5 μ l article one chain synthesis reaction products, water 9.5 μ l.PCR reaction conditions: 94 ℃ of pre-sex change 4min; 94 ℃ of sex change 30sec; 60 ℃ of annealing 30sec; 72 ℃ are extended 2.5min; 30 circulations.1% agarose gel electrophoresis is identified, reclaims near the specific fragment (seeing Fig. 8-3) of 750bp.Reclaim fragment and adopt PCR method to introduce the ribosomal display element again, carry out ribosomal display once more, promptly repeat embodiment 4-7.Through behind the three-wheel ribosomal display, last takes turns the RT-PCR product of screening, expresses and identifies according to the operation of embodiment 10.
9. the evaluation of external translation product
Before carrying out affine screening, need be to whether successfully carrying out external translation and in vitro translated integrity is identified.Because external translation system is less, the amount of translation product is less, and therefore common SDS-PAGE electrophoresis and the sensitivity of Western-blotting can be satisfied the detection requirement.We adopt the TranscendTM Biotinlated Lysine tRNA of Pu Luomaige company as the translation substrate, be used for external translation and make the translation product biotinylation, detect so that further adopt HRP mark streptavidin Color Appearance System to carry out Western-blotting.The sensitivity of this method is suitable with radioautograph Western-blotting.
(1) mixes following component on ice: premixture (250mM Tris-HAc pH7.5, aminoacid mixture is (except that methionine(Met), every seed amino acid 1.75mM) 10mM ATP, 2.5mM GTP, 5mM cAMP, 150mM acetylphosphate, 2.5mg/ml E.coli tRNA, 0.1mg/ml folic acid, 7.5%PEG 8000): 22 μ l; Methionine(Met) (200mM): 1.1 μ l; Potassium glutamate (2M): 11 μ l; Mg (Ac)
2(100mM): 7.6 μ l; Anti-ssrA (200 μ M): 2 μ l; Eucaryon molecular chaperones PDI (44 μ M) (available from Sigma company): 1.5 μ l; S-30 extract (available from Pu Luomaige company) 40 μ l; Transcend
TMBiotinlated Lysine tRNA (available from Pu Luomaige company): 1-2 μ l.Moisturizing to 100 μ l.
(2) add 10 μ g/10 μ l mRNA storehouses, behind the mixing, 37 ℃ of water-baths were placed 7 minutes gently.
(3) carry out the discontinuous SDS-PAGE electrophoresis of sex change, resolving gel concentration 8%.
(4) after electrophoresis finishes,, put into electricity and change damping fluid and soak, cut out than the big slightly cellulose membrane of gel and in smaller filter paper one coexists electricity commentaries on classics damping fluid, soak gel clear water rinsing.On electricity commentaries on classics folder, add successively: filter paper-gel-cellulose membrane-filter paper, each interlayer bubble of Ex-all.
(5) electricity changes: after constant current 0.3-0.4A electricity changes 1-2hr, take off tunica fibrosa and gel, clean tunica fibrosa with TBS damping fluid (pH 7.5 for 100mM Tris-Cl, 0.9% (w/v) NaCl).
(6) sealing: cellulose membrane is immersed in the confining liquid, gently jolting 2hr.
(7) streptavidin of interpolation HRP mark: wash film three times with TBST damping fluid (pH 7.5 for 100mM Tris-Cl, 0.9% (w/v) NaCl, 0.05-0.1% (V/V) Tween-100), each 5min.Cellulose membrane is immersed in the confining liquid of the streptavidin that contains proper concn HRP mark.Jolting 1hr gently,
(8) colour developing: wash membrane method as above.Add DAB colour developing liquid (5ml 100mM Tris-Cl, pH7.5; (' diaminobenzidine is available from Sigma company for DAB:3.3 for 100 μ l DAB stock solutions.After water-soluble (40mg/ml), be distributed into 100 μ l ,-20 ℃ of preservations); 25 μ l NiCl stock solutions (water-soluble, 80g/ml is distributed into 100 μ l ,-20 ℃ of preservations); 15 μ l 30%H
2O
2).
Use flushing with clean water when (9) treating colour developing to desirable degree, termination reaction, cellulose membrane keeps in Dark Place after fully washing.(the results are shown in Figure 8-4)
10. the structure of secreted expression carrier pFUW802
This laboratory is at carrier pCOMB3 (Huse WD, et al., Generation of a largecombinatorial library of the immunoglobulin repertoire in phage lambda.Science.1989 Dec; 246 (4935): made up secreted expression carrier pFUW80 (Zhang Weiguo etc., the structure in phage oblatio single-chain antibody expression vector and mouse nonspecific antibody storehouse, Acta Genetica Sinica, 26 (2) 99-106,1999) on basis 1275-81.).This carrier has His purification tag (His) 6 after multiple clone site, therefore can adopt metal chelate affinity chromatography that the foreign protein that uses this vector expression is directly carried out purifying.For directly carrying out ELISA, the foreign protein to this vector expression detects, we replace with c-myc detection label (EQKLISEEDL) with the His purification tag, and (c-myc detection label sequence is from the document of publishing: Hilpert K.et al., Anti-c-myc antibody 9E 10:epitope key positions and variability characterizedusing peptide spot synthesis on cellulose.Protein Eng.2001 Oct; 14 (10): 803-6.), be built into secreted expression carrier pFUW802, experimental result is not delivered.The sketch of pFUW802 is seen Fig. 9.
11: the secretion type expression of antibody and salt shock method are extracted pericentral siphon chamber component
(1) last is taken turns the RT-PCR product that screening obtains, XhoI/EcoRI is two to be connected into secreted expression carrier pFUW802 (sketch is seen Fig. 9) after cutting, transformed into escherichia coli HB2151 (available from Pharmacia company) is coated with LB-A flat board (10g/l tryptone (available from GIBCO company, down together), 5g/l yeast extract is (available from GIBCO company, down together), 5g/l NaCl, 15g/l agar and 100 μ g/ml penbritins, pH7.5), 37 ℃ of overnight incubation.
(2) picking mono-clonal is inoculated 96 hole depth well culture plates, 1ml SBAG-2% liquid nutrient medium/hole (35g/l tryptone, 20g/l yeast extract, 5g/l NaCl, and 100 μ g/ml penbritins, pH7.5,2% glucose), 30 ℃ of shaking table incubated overnight, 250rpm.
In (3) the 1/100 switching Boiling tubes, 5ml SBAG-0.1% liquid nutrient medium/pipe (35g/l tryptone, 20g/l yeast extract, 5g/l NaCl, and 100 μ g/ml penbritins, pH7.5,0.1% glucose), 30 ℃ of shaking tables are cultivated 2-3hr, 250rpm, to OD600=0.8-0.9, add IPTG (isopropyl-) (available from the precious biotech company in Dalian) to final concentration 1mM.Continue 30 ℃ of shaking tables and cultivate 20-24hr, 250rpm.1, the centrifugal 20min of 500g collects all thalline.The careful supernatant of absorbing.Every pipe adds 100 μ l, 1 * TES damping fluid (0.2M Tris-HCl pH8.0,0.5mM EDTA, 0.5M sucrose), add 1/5 * TES of 150 μ l ice precooling behind the mixing, mixing is placed 30min on ice once more, carry out the salt shock, 12, the centrifugal 10min of 000g keeps supernatant.
(4) adopt same condition abduction delivering mouse-anti 4-BB single-chain antibody (m4b4-1 scFv) and extraction pericentral siphon chamber component.M4b4-1 scFv will publish document (Hong HJ for this laboratory, et al., A humanized anti--4-1BB monoclonal antibody suppressesantigen-induced humoral immune response in nonhuman primates.JImmunother.2000 Nov-Dec; 23 (6): 613-21.) listed VH and VL sequence, link to each other with the general connection peptides of single-chain antibody (GGGGSGGGGSGGGG S), make up and to form, experimental result is not delivered.
(5) the direct ELISA of employing detects the antibody binding activity in the extract of above-mentioned pericentral siphon chamber.The ELISA operation is carried out according to ordinary method.Wherein it is to be noted: (4-1BB is available from R﹠amp for antigen; D company) wraps by concentration: 1 μ g/ml; Anti-c-myc tag antibody (9E10) detects antibody (available from R﹠amp as one-level; D company); The HRP-sheep anti-mouse igg as secondary detection antibody (available from R﹠amp; D company); OPD (O-Phenylene Diamine) (available from Sigma company) colour developing.Pericentral siphon chamber extract directly detects without dilution.We have had picking altogether 20 clones survey through ELISA and to live, and determine wherein 5 positive clones of clone.Behind dna sequencing (Shanghai Bo Ya Bioisystech Co., Ltd), find that these 5 clones have three kinds of antibody sequence: re-1 (1 clone) respectively, re-2 (1 clone) and re-3 (3 clones).Big section VH sequence of Re-1 reshaping antibody sequence deletion is in conjunction with active minimum; Re-2 reshaping antibody sequence deletion light chain CDR3 is in conjunction with active placed in the middle; The sequence of complete of re-3 antibody is the highest in conjunction with activity.The ELISA measurement result that Figure 10 has listed three positive colonies the results are shown in.The aminoacid sequence of Re-3 clone VH and VL is seen Figure 11-1 and Figure 11-2.
12. change the sequence and the structural analysis of the anti-4-1BB single-chain antibody of shape
To change the VH of the anti-4-1BB single-chain antibody of shape re-3 and VL sequence respectively with mouse-anti 4-1BB monoclonal antibody (4b4-1), the VH and the VL sequence of mouse source subgroup consensus sequence and people's From Template subgroup consensus sequence compare (seeing Figure 11-1 and Figure 11-2).Found that in the design degeneracy site of the VH that changes the anti-4-1BB single-chain antibody of shape re-3 have 11 to select people source residue (V5, S7, V11, V20, T30, G44, M48, V68, I70, A72 T74), selects mouse source residue (V12 for 3, M76, S91), 4 undergo mutation (N38, S67, P85, S87); In the design degeneracy site of VL, have 7 selected people source residue (P8, L11, A19, T20, T74, F83, A84), 5 select mouse source residue (T14, D17, E42, S43, L104), 1 undergo mutation (N6O).The back is analyzed in above-mentioned 5 sudden changes found (analytical results is seen as Figure 11-3), four sudden changes (VH:N38, S67, S87; VL:N6O) be the result that the degenerate core thuja acid is recombinated at random.Another one sudden change (VH:P85) is due to nondegenerate site generation Nucleotide random mutation.This illustrate we successfully carry out anti-4-1BB single-chain antibody change shape in, by introducing sudden change and screening, realized molecular orientation evolvement.
Re-3 and m4b4-1 scFv are carried out online structural simulation (network address is http://www.expasy.org/swissmod/SWISS-MODEL.html) and online texture ratio respectively to (network address is http://cl.sdsc.edu/ce.html).Comparison result is seen Figure 12-A.(region1, region2 region3) all are positioned at VH and (see Figure 12-B in the district that obviously do not match between re-3 and m4b4-1 scFv, Figure 12-C, Figure 12-D, Figure 12-E), and two sudden changes in HFR2 district (P85, S87) structure to CDR3 looks like to have produced long-range influence.These two sites will be when further carrying out affinity matured antibody, need carry out the site that emphasis is optimized.
SEQUENCE?LISTING
＜110〉Beijing Anbote Gene Engineering Co., Ltd.
Inst. of Genetics and Development Biology, CAS
＜120〉a kind of antibody that is used for changes the new external molecular orientation evolvement method of shape
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cag?gtt?cag?ctg?gtg?caa?tcg?ggt?gcg?gaa?gtg?gtg?aaa?ccg?ggt?gca 48
Gln?Val?Gln?Leu?Val?Gln?Ser?Gly?Ala?Glu?Val?Val?Lys?Pro?Gly?Ala
1 5 10 15
tct?gtt?aaa?gtg?tct?tgc?aaa?gcg?agc?ggt?tac?acc?ttc?acc?tct?tac 96
Ser?Val?Lys?Val?Ser?Cys?Lys?Ala?Ser?Gly?Tyr?Thr?Phe?Thr?Ser?Tyr
20 25 30
tgg?atg?cac?tgg?gtt?aat?cag?cgt?ccg?ggt?cag?ggt?ctg?gaa?tgg?atg 144
Trp?Met?His?Trp?Val?Asn?Gln?Arg?Pro?Gly?Gln?Gly?Leu?Glu?Trp?Met
35 40 45
ggt?gaa?atc?aac?ccg?ggt?aac?ggc?cac?acc?aac?tac?aac?gaa?aaa?ttc 192
Gly?Glu?Ile?Asn?Pro?Gly?Asn?Gly?His?Thr?Asn?Tyr?Asn?Glu?Lys?Phe
50 55 60
aaa?agc?agt?gtg?acc?att?acc?gcg?gac?acg?tct?agc?agc?acc?gcg?tac 240
Lys?Ser?Ser?Val?Thr?Ile?Thr?Ala?Asp?Thr?Ser?Ser?Ser?Thr?Ala?Tyr
65 70 75 80
atg?cag?ctg?agc?ccc?ctg?agc?agc?gaa?gac?agc?gct?gtt?tac?tac?tgc 288
Met?Gln?Leu?Ser?Pro?Leu?Ser?Ser?Glu?Asp?Ser?Ala?Val?Tyr?Tyr?Cys
85 90 95
gca?cgt?tct?ttc?acc?acc?gct?tgt?gcg?ttc?gcc?tac?tgg?ggt?cag?ggc 336
Ala?Arg?Ser?Phe?Thr?Thr?Ala?Cys?Ala?Phe?Ala?Tyr?Trp?Gly?Gln?Gly
100 105 110
acc?ctg?gtg?acc?gtt?tcc?tcc?act?agt?gga?ggc?ggt?ggg?agc?ggc?ggt 384
Thr?Leu?Val?Thr?Val?Ser?Ser?Thr?Ser?Gly?Gly?Gly?Gly?Ser?Gly?Gly
115 120 125
ggt?tct?ggg?ggt?ggc?ggc?agc?tct?aga?gac?atc?gtt?atg?acc?cag?agc 432
Gly?Ser?Gly?Gly?Gly?Gly?Ser?Ser?Arg?Asp?Ile?Val?Met?Thr?Gln?Ser
130 135 140
ccg?gcg?acc?ctg?agc?gtg?acc?ccg?ggt?gat?cgt?gcg?acc?ctg?tct?tgc 480
Pro?Ala?Thr?Leu?Ser?Val?Thr?Pro?Gly?Asp?Arg?Ala?Thr?Leu?Ser?Cys
145 150 155 160
cgt?gcg?tct?cag?acc?atc?agc?gac?tac?ctg?cac?tgg?tac?caa?cag?aaa 528
Arg?Ala?Ser?Gln?Thr?Ile?Ser?Asp?Tyr?Leu?His?Trp?Tyr?Gln?Gln?Lys
165 170 175
agc?cac?gaa?tcc?ccg?cgt?ctg?ctg?atc?aaa?tac?gca?tct?cag?tct?atc 576
Ser?His?Glu?Ser?Pro?Arg?Leu?Leu?Ile?Lys?Tyr?Ala?Ser?Gln?Ser?Ile
180 185 190
agc?ggt?atc?ccg?aac?cgt?ttc?tct?ggt?tcc?ggt?agc?ggt?tct?gac?ttc 624
Ser?Gly?Ile?Pro?Asn?Arg?Phe?Ser?Gly?Ser?Gly?Ser?Gly?Ser?Asp?Phe
195 200 205
acc?ctg?acc?atc?aac?agc?gtg?gaa?ccg?gaa?gac?ttt?gcc?gtg?tac?tac 672
Thr?Leu?Thr?Ile?Asn?Ser?Val?Glu?Pro?Glu?Asp?Phe?Ala?Val?Tyr?Tyr
210 215 220
tgc?cag?gac?ggt?cac?tct?ttc?ccg?ccg?acc?ttc?gga?ggt?ggt?acc?aaa 720
Cys?Gln?Asp?Gly?His?Ser?Phe?Pro?Pro?Thr?Phe?Gly?Gly?Gly?Thr?Lys
225 230 235 240
ctg?gaa?atc?aaa 732
Leu?Glu?Ile?Lys
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Gln?Val?Gln?Leu?Val?Gln?Ser?Gly?Ala?Glu?Val?Val?Lys?Pro?Gly?Ala
1 5 10 15
Ser?Val?Lys?Val?Ser?Cys?Lys?Ala?Ser?Gly?Tyr?Thr?Phe?Thr?Ser?Tyr
20 25 30
Trp?Met?His?Trp?Val?Asn?Gln?Arg?Pro?Gly?Gln?Gly?Leu?Glu?Trp?Met
35 40 45
Gly?Glu?Ile?Asn?Pro?Gly?Asn?Gly?His?Thr?Asn?Tyr?Asn?Glu?Lys?Phe
50 55 60
Lys?Ser?Ser?Val?Thr?Ile?Thr?Ala?Asp?Thr?Ser?Ser?Ser?Thr?Ala?Tyr
65 70 75 80
Met?Gln?Leu?Ser?Pro?Leu?Ser?Ser?Glu?Asp?Ser?Ala?Val?Tyr?Tyr?Cys
85 90 95
Ala?Arg?Ser?Phe?Thr?Thr?Ala?Cys?Ala?Phe?Ala?Tyr?Trp?Gly?Gln?Gly
100 105 110
Thr?Leu?Val?Thr?Val?Ser?Ser?Thr?Ser?Gly?Gly?Gly?Gly?Ser?Gly?Gly
115 120 125
Gly?Ser?Gly?Gly?Gly?Gly?Ser?Ser?Arg?Asp?Ile?Val?Met?Thr?Gln?Ser
130 135 140
Pro?Ala?Thr?Leu?Ser?Val?Thr?Pro?Gly?Asp?Arg?Ala?Thr?Leu?Ser?Cys
145 150 155 160
Arg?Ala?Ser?Gln?Thr?Ile?Ser?Asp?Tyr?Leu?His?Trp?Tyr?Gln?Gln?Lys
165 170 175
Ser?His?Glu?Ser?Pro?Arg?Leu?Leu?Ile?Lys?Tyr?Ala?Ser?Gln?Ser?Ile
180 185 190
Ser?Gly?Ile?Pro?Asn?Arg?Phe?Ser?Gly?Ser?Gly?Ser?Gly?Ser?Asp?Phe
195 200 205
Thr?Leu?Thr?Ile?Asn?Ser?Val?Glu?Pro?Glu?Asp?Phe?Ala?Val?Tyr?Tyr
210 215 220
Cys?Gln?Asp?Gly?His?Ser?Phe?Pro?Pro?Thr?Phe?Gly?Gly?Gly?Thr?Lys
225 230 235 240
Leu?Glu?Ile?Lys
Claims (13)
1. one kind is used for the external molecular orientation evolvement method that antibody changes shape, comprises the following steps:
(1), determines the position of key amino acid residue according to the species specificity and the individual specificity that determine antibody sequence according to the conservative property of antibody sequence on evolving;
(2) make up elementary reshaping antibody storehouse by synthetic oligonucleotide fragment of degeneracy and overlapping pcr, and adopt recombinate at random degeneracy site and introduce random mutation of DNA shuffling technology, form secondary reshaping antibody storehouse; With
(3) method by PCR makes up the ribosomal display template, carries out the ribosomal display screening.
2. according to the method for claim 1, comprise the following steps:
(1) is template with the variable region of heavy chain VH of mouse source antibody and the aminoacid sequence of variable region of light chain VL, adopts the method for homology search, from existing immunoglobulin sequences storehouse, seek the CDR transplant recipient;
(2) mouse source antibody sequence and subgroup consensus sequence, candidate's transplant recipient antibody sequence and subgroup consensus sequence thereof are compared consistent sequence in the CDR district that keeps mouse source antibody and the FR district;
(3) one section repeated connection peptides GGGGSGGGGSGGGGS of between interpolation is designed to change the shape single-chain antibody library;
(4) according to the password sublist of intestinal bacteria hobby, this is changed the shape single-chain antibody library translate into dna sequence dna;
(5) according to the requirement of overlapping PCR, will change shape single-chain antibody library DNA " fractionation " and become the following single strain oligonucleotide fragment of 60 Nucleotide, further adopt overlapping pcr to make up the elementary shape single-chain antibody library that changes,
(6) by adopting the DNA shuffling technology, recombinate at random, make up the secondary shape single-chain antibody library that changes,
(7) adopt a step PCR reaction, introduce the ribosomal display element and carry out ribosomal display,
(8) take turns ribosomal display screening through 3 after, the screening product directly is connected into secreted expression carrier, transformed into escherichia coli through endonuclease reaction, carry out secretion type expression and determination of activity, identify to have the higher active clone that combines,, obtain changing the shape single-chain antibody through after the sequence verification with antigen.
3. in accordance with the method for claim 1, it is characterized in that the antibody that adopts this strategy to change shape comprises Fab, single-chain antibody, single domain antibody.
4. the method for claim 3, the antibody that wherein changes shape is anti-4-1BB single-chain antibody.
5. one kind is used the anti-4-1BB that is adapted at expression in escherichia coli of the method structure of claim 4 to change the shape single-chain antibody.
6. the anti-4-1BB of claim 5 changes shape single-chain antibody re-3, it is characterized in that having following aminoacid sequence:
1 QVQLVQSGAE?VVKPGASVKV?SCKASGYTFT?SYWMHWVNQR?PGQGLEWMGE
51 INPGNGHTNY?NEKFKSSVTI?TADTSSSTAY?MQLSPLSSED?SAVYYCARSF
101 TTACAFAYWG?QGTLVTVSST?SGGGGSGGGS?GGGGSSRDIV?MTQSPATLSV
151 TPGDRATLSC?RASQTISDYL?HWYQQKSHES?PRLLIKYASQ?SISGIPNRFS
201 GSGSGSDFTL?TINSVEPEDF?AVYYCQDGHS?FPPTFGGGTK?LEIK。
7. the anti-4-1BB of coding claim 5 changes the nucleotide sequence of shape single-chain antibody re-3.
8. the nucleotide sequence of claim 7 is characterized in that having following nucleotide sequence:
1 CAG?GTT?CAG?CTG?GTG?CAA?TCG?GGT?GCG?GAA?GTG?GTG?AAA?CCG?GGT
46 GCA?TCT?GTT?AAA?GTG?TCT?TGC?AAA?GCG?AGC?GGT?TAC?ACC?TTC?ACC
91 TCT?TAC?TGG?ATG?CAC?TGG?GTT?AAT?CAG?CGT?CCG?GGT?CAG?GGT?CTG
136 GAA?TGG?ATG?GGT?GAA?ATC?AAC?CCG?GGT?AAC?GGC?CAC?ACC?AAC?TAC
181 AAC?GAA?AAA?TTC?AAA?AGC?AGT?GTG?ACC?ATT?ACC?GCG?GAC?ACG?TCT
226 AGC?AGC?ACC?GCG?TAC?ATG?CAG?CTG?AGC?CCC?CTG?AGC?AGC?GAA?GAC
271 AGC?GCT?GTT?TAC?TAC?TGC?GCA?CGT?TCT?TTC?ACC?ACC?GCT?TGT?GCG
316 TTC?GCC?TAC?TGG?GGT?CAG?GGC?ACC?CTG?GTG?ACC?GTT?TCC?TCC?ACT
361 AGT?GGA?GGC?GGT?GGG?AGC?GGC?GGT?GGT?TCT?GGG?GGT?GGC?GGC?AGC
406 TCT?AGA?GAC?ATC?GTT?ATG?ACC?CAG?AGC?CCG?GCG?ACC?CTG?AGC?GTG
451 ACC?CCG?GGT?GAT?CGT?GCG?ACC?CTG?TCT?TGC?CGT?GCG?TCT?CAG?ACC
496 ATC?AGC?GAC?TAC?CTG?CAC?TGG?TAC?CAA?CAG?AAA?AGC?CAC?GAA?TCC
541 CCG?CGT?CTG?CTG?ATC?AAA?TAC?GCA?TCT?CAG?TCT?ATC?AGC?GGT?ATC
586 CCG?AAC?CGT?TTC?TCT?GGT?TCC?GGT?AGC?GGT?TCT?GAC?TTC?ACC?CTG
631 ACC?ATC?AAC?AGC?GTG?GAA?CCG?GAA?GAC?TTT?GCC?GTG?TAC?TAC?TGC
676 CAG?GAC?GGT?CAC?TCT?TTC?CCG?CCG?ACC?TTC?GGA?GGT?GGT?ACC?AAA
721 CTG?GAA?ATC?AAA
9. an anti-4-1BB changes the carrier of shape single-chain antibody, and it contains the nucleotide sequence of claim 7 or 8.
10. the carrier of claim 9, it is 4-1BB-pFUW802.
11. a host cell contains the carrier of claim 9 or 10.
12. the host cell of claim 11, it is a Bacillus coli cells.
13. the host cell of claim 12, it is an intestinal bacteria HB2151 cell.
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| CN111462815A (en) * | 2020-03-27 | 2020-07-28 | 上海祥耀生物科技有限责任公司 | Antibody library construction method and device |
| CN111462815B (en) * | 2020-03-27 | 2023-05-02 | 上海祥耀生物科技有限责任公司 | Construction method and device of antibody library |
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