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Engineering peptide ligase specificity by proteomic identification of ligation sites.

Abstract：

:Enzyme-catalyzed peptide ligation is a powerful tool for site-specific protein bioconjugation, but stringent enzyme-substrate specificity limits its utility. We developed an approach for comprehensively characterizing peptide ligase specificity for N termini using proteome-derived peptide libraries. We used this strategy to characterize the ligation efficiency for >25,000 enzyme-substrate pairs in the context of the engineered peptide ligase subtiligase and identified a family of 72 mutant subtiligases with activity toward N-terminal sequences that were previously recalcitrant to modification. We applied these mutants individually for site-specific bioconjugation of purified proteins, including antibodies, and in algorithmically selected combinations for sequencing of the cellular N terminome with reduced sequence bias. We also developed a web application to enable algorithmic selection of the most efficient subtiligase variant(s) for bioconjugation to user-defined sequences. Our methods provide a new toolbox of enzymes for site-specific protein modification and a general approach for rapidly defining and engineering peptide ligase specificity.

journal_name

Nat Chem Biol

journal_title

Nature chemical biology

authors

Weeks AM,Wells JA

doi

10.1038/nchembio.2521

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

50-57

issue

1

eissn

1552-4450

issn

1552-4469

pii

nchembio.2521

journal_volume

14

pub_type

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