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자료유형
학술저널
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한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제24권 제3호
발행연도
2014.1
수록면
408 - 420 (13page)

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Yeast surface-displayed antibody libraries provide an efficient and quantitative screeningresource for given antigens, but suffer from typically modest library sizes owing to low yeasttransformation efficiency. Yeast mating is an attractive method for overcoming the limit ofyeast transformation to construct a large, combinatorial antibody library, but the optimalconditions have not been reported. Here, we report a large synthetic human Fab (antigenbinding fragment) yeast surface-displayed library generated by stepwise optimization of yeastmating conditions. We first constructed HC (heavy chain) and LC (light chain) libraries, whereall of the six CDRs (complementarity-determining regions) of the variable domains werediversified mimicking the human germline antibody repertoires by degenerate codons, ontosingle frameworks of VH3-23 and Vκ1-16 germline sequences, in two haploid cells of oppositemating types. Yeast mating conditions were optimized in the order of cell density, media pH,and cell growth phase, yielding a mating efficiency of ~58% between the two haploid cellscarrying HC and LC libraries. We constructed two combinatorial Fab libraries with CDR-H3 of9 or 11 residues in length with colony diversities of more than 109 by one round of yeastmating between the two haploid HC and LC libraries, with modest diversity sizes of ~107. Thesynthetic human Fab yeast-displayed libraries exhibited relative amino acid compositions ineach position of the six CDRs that were very similar to those of the designed repertoires,suggesting that they are a promising source for human Fab antibody screening.

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