Kinetics and Optimization of the Lysine–Isopeptide Bond Forming Sortase Enzyme from Corynebacterium diphtheriae
Abstract
Site-specifically modified protein bioconjugates have important applications in biology, chemistry and medicine. Functionalizing specific protein side chains with enzymes using mild reaction conditions is of significant interest, but remains challenging. Recently, the lysine-isopeptide bond forming activity of the sortase enzyme that builds surface pili in Corynebacterium diphtheriae (CdSrtA) has been reconstituted in vitro. A mutationally activated form of CdSrtA was shown to be a promising bioconjugating enzyme that can attach Leu-Pro-Leu-Thr-Gly peptide fluorophores to a specific lysine residue within the N-terminal domain of the SpaA protein (NSpaA), enabling the labeling of target proteins that are fused to NSpaA. Here we present a detailed analysis of the CdSrtA catalyzed protein labeling reaction. We show that the first step in catalysis is rate limiting, which is the formation of the CdSrtA-peptide thioacyl intermediate that subsequently reacts with a lysine e-amine in NSpaA. This intermediate is surprisingly stable, limiting spurious proteolysis of the peptide substrate. We report the discovery of a new enzyme variant (CdSrtAΔ) that has significantly improved transpeptidation activity because it completely lacks an inhibitory polypeptide appendage (“lid”) that normally masks the active site. We show that the presence of the lid primarily impairs formation of the thioacyl intermediate and notmore »
- Authors:
-
- Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. UCLA-DOE Inst. for Genomics and Proteomics
- Univ. of California, Los Angeles, CA (United States). Molecular Biology Inst. Division of Oral Biology and Medicine. School of Dentistry
- Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. Molecular Biology Inst.
- Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. UCLA-DOE Inst. for Genomics and Proteomics. Molecular Biology Inst.
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1799607
- Alternate Identifier(s):
- OSTI ID: 1833089
- Grant/Contract Number:
- FC02-02ER63421
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Bioconjugate Chemistry
- Additional Journal Information:
- Journal Volume: 31; Journal Issue: 6; Journal ID: ISSN 1043-1802
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; high-performance liquid chromatography; peptides and proteins; monomers; labeling; catalysis
Citation Formats
Sue, Christopher K., McConnell, Scott A., Ellis-Guardiola, Ken, Muroski, John M., McAllister, Rachel A., Yu, Justin, Alvarez, Ana I., Chang, Chungyu, Ogorzalek Loo, Rachel R., Loo, Joseph A., Ton-That, Hung, and Clubb, Robert T. Kinetics and Optimization of the Lysine–Isopeptide Bond Forming Sortase Enzyme from Corynebacterium diphtheriae. United States: N. p., 2020.
Web. doi:10.1021/acs.bioconjchem.0c00163.
Sue, Christopher K., McConnell, Scott A., Ellis-Guardiola, Ken, Muroski, John M., McAllister, Rachel A., Yu, Justin, Alvarez, Ana I., Chang, Chungyu, Ogorzalek Loo, Rachel R., Loo, Joseph A., Ton-That, Hung, & Clubb, Robert T. Kinetics and Optimization of the Lysine–Isopeptide Bond Forming Sortase Enzyme from Corynebacterium diphtheriae. United States. https://doi.org/10.1021/acs.bioconjchem.0c00163
Sue, Christopher K., McConnell, Scott A., Ellis-Guardiola, Ken, Muroski, John M., McAllister, Rachel A., Yu, Justin, Alvarez, Ana I., Chang, Chungyu, Ogorzalek Loo, Rachel R., Loo, Joseph A., Ton-That, Hung, and Clubb, Robert T. Tue .
"Kinetics and Optimization of the Lysine–Isopeptide Bond Forming Sortase Enzyme from Corynebacterium diphtheriae". United States. https://doi.org/10.1021/acs.bioconjchem.0c00163. https://www.osti.gov/servlets/purl/1799607.
@article{osti_1799607,
title = {Kinetics and Optimization of the Lysine–Isopeptide Bond Forming Sortase Enzyme from Corynebacterium diphtheriae},
author = {Sue, Christopher K. and McConnell, Scott A. and Ellis-Guardiola, Ken and Muroski, John M. and McAllister, Rachel A. and Yu, Justin and Alvarez, Ana I. and Chang, Chungyu and Ogorzalek Loo, Rachel R. and Loo, Joseph A. and Ton-That, Hung and Clubb, Robert T.},
abstractNote = {Site-specifically modified protein bioconjugates have important applications in biology, chemistry and medicine. Functionalizing specific protein side chains with enzymes using mild reaction conditions is of significant interest, but remains challenging. Recently, the lysine-isopeptide bond forming activity of the sortase enzyme that builds surface pili in Corynebacterium diphtheriae (CdSrtA) has been reconstituted in vitro. A mutationally activated form of CdSrtA was shown to be a promising bioconjugating enzyme that can attach Leu-Pro-Leu-Thr-Gly peptide fluorophores to a specific lysine residue within the N-terminal domain of the SpaA protein (NSpaA), enabling the labeling of target proteins that are fused to NSpaA. Here we present a detailed analysis of the CdSrtA catalyzed protein labeling reaction. We show that the first step in catalysis is rate limiting, which is the formation of the CdSrtA-peptide thioacyl intermediate that subsequently reacts with a lysine e-amine in NSpaA. This intermediate is surprisingly stable, limiting spurious proteolysis of the peptide substrate. We report the discovery of a new enzyme variant (CdSrtAΔ) that has significantly improved transpeptidation activity because it completely lacks an inhibitory polypeptide appendage (“lid”) that normally masks the active site. We show that the presence of the lid primarily impairs formation of the thioacyl intermediate and not recognition of the NSpaA substrate. Quantitative measurements reveal that CdSrtAΔ generates its crosslinked product with a catalytic turnover number of 1.4 ± 0.004 hr-1 and that it has apparent KM values of 0.16 ± 0.04 and 1.6 ± 0.3 mM for its NSpaA and peptide substrates, respectively. CdSrtAΔ is 7-fold more active than previously studied variants, labeling >90% of NSpaA with peptide within 6 hours. The results of this study further improve the utility of CdSrtA as a protein labeling tool and provide insight into the enzyme catalyzed reaction that underpins protein labeling and pilus biogenesis.},
doi = {10.1021/acs.bioconjchem.0c00163},
journal = {Bioconjugate Chemistry},
number = 6,
volume = 31,
place = {United States},
year = {Tue May 12 00:00:00 EDT 2020},
month = {Tue May 12 00:00:00 EDT 2020}
}
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