Conserved residue His-257 of Vibrio cholerae flavin transferase ApbE plays a critical role in substrate binding and catalysis
Abstract
The flavin transferase ApbE plays essential roles in bacterial physiology, covalently incorporating FMN cofactors into numerous respiratory enzymes that use the integrated cofactors as electron carriers. In this work we performed a detailed kinetic and structural characterization of Vibrio cholerae WT ApbE and mutants of the conserved residue His-257, to understand its role in substrate binding and in the catalytic mechanism of this family. Bi-substrate kinetic experiments revealed that ApbE follows a random Bi Bi sequential kinetic mechanism, in which a ternary complex is formed, indicating that both substrates must be bound to the enzyme for the reaction to proceed. Steady-state kinetic analyses show that the turnover rates of His-257 mutants are significantly smaller than those of WT ApbE, and have increased Km values for both substrates, indicating that the His-257 residue plays important roles in catalysis and in enzyme-substrate complex formation. Analyses of the pH dependence of ApbE activity indicate that the pKa of the catalytic residue (pKES1) increases by 2 pH units in the His-257 mutants, suggesting that this residue plays a role in substrate deprotonation. The crystal structures of WT ApbE and an H257G mutant were determined at 1.61 and 1.92 Å resolutions, revealing that His-257 ismore »
- Authors:
-
- Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Biological Science
- Univ. of Chicago, Chicago, IL (United States). Center for Structural Genomics of Infectious Diseases (CSGID), Consortium for Advanced Science and Engineering; Argonne National Lab. (ANL), Lemont, IL (United States). Biosciences Division, Structural Biology Center
- Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Biological Science; Argonne National Lab. (ANL), Lemont, IL (United States). Biophysics Collaborative Access Team, Advanced Proton Source
- Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Institutes of Health (NIH), National Institute of Allergy and Infectious Diseases (NIAID); Illinois Inst. of Technology, Chicago, IL (United States); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1570236
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Biological Chemistry
- Additional Journal Information:
- Journal Volume: 294; Journal Issue: 37; Journal ID: ISSN 0021-9258
- Publisher:
- American Society for Biochemistry and Molecular Biology
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ApbE; NQR; RNF; flavin transferase; random sequential kinetic mechanism; pKa; general base catalysis; Histidine
Citation Formats
Fang, Xuan, Osipiuk, Jerzy, Chakravarthy, Srinivas, Yuan, Ming, Menzer, William M., Nissen, Devin, Liang, Pingdong, Raba, Daniel A., Tuz, Karina, Howard, Andrew J., Joachimiak, Andrzej, Minh, David D. L., and Juarez, Oscar. Conserved residue His-257 of Vibrio cholerae flavin transferase ApbE plays a critical role in substrate binding and catalysis. United States: N. p., 2019.
Web. doi:10.1074/jbc.RA119.008261.
Fang, Xuan, Osipiuk, Jerzy, Chakravarthy, Srinivas, Yuan, Ming, Menzer, William M., Nissen, Devin, Liang, Pingdong, Raba, Daniel A., Tuz, Karina, Howard, Andrew J., Joachimiak, Andrzej, Minh, David D. L., & Juarez, Oscar. Conserved residue His-257 of Vibrio cholerae flavin transferase ApbE plays a critical role in substrate binding and catalysis. United States. https://doi.org/10.1074/jbc.RA119.008261
Fang, Xuan, Osipiuk, Jerzy, Chakravarthy, Srinivas, Yuan, Ming, Menzer, William M., Nissen, Devin, Liang, Pingdong, Raba, Daniel A., Tuz, Karina, Howard, Andrew J., Joachimiak, Andrzej, Minh, David D. L., and Juarez, Oscar. Fri .
"Conserved residue His-257 of Vibrio cholerae flavin transferase ApbE plays a critical role in substrate binding and catalysis". United States. https://doi.org/10.1074/jbc.RA119.008261. https://www.osti.gov/servlets/purl/1570236.
@article{osti_1570236,
title = {Conserved residue His-257 of Vibrio cholerae flavin transferase ApbE plays a critical role in substrate binding and catalysis},
author = {Fang, Xuan and Osipiuk, Jerzy and Chakravarthy, Srinivas and Yuan, Ming and Menzer, William M. and Nissen, Devin and Liang, Pingdong and Raba, Daniel A. and Tuz, Karina and Howard, Andrew J. and Joachimiak, Andrzej and Minh, David D. L. and Juarez, Oscar},
abstractNote = {The flavin transferase ApbE plays essential roles in bacterial physiology, covalently incorporating FMN cofactors into numerous respiratory enzymes that use the integrated cofactors as electron carriers. In this work we performed a detailed kinetic and structural characterization of Vibrio cholerae WT ApbE and mutants of the conserved residue His-257, to understand its role in substrate binding and in the catalytic mechanism of this family. Bi-substrate kinetic experiments revealed that ApbE follows a random Bi Bi sequential kinetic mechanism, in which a ternary complex is formed, indicating that both substrates must be bound to the enzyme for the reaction to proceed. Steady-state kinetic analyses show that the turnover rates of His-257 mutants are significantly smaller than those of WT ApbE, and have increased Km values for both substrates, indicating that the His-257 residue plays important roles in catalysis and in enzyme-substrate complex formation. Analyses of the pH dependence of ApbE activity indicate that the pKa of the catalytic residue (pKES1) increases by 2 pH units in the His-257 mutants, suggesting that this residue plays a role in substrate deprotonation. The crystal structures of WT ApbE and an H257G mutant were determined at 1.61 and 1.92 Å resolutions, revealing that His-257 is located in the catalytic site and that the substitution does not produce major conformational changes. In this paper, we propose a reaction mechanism in which His-257 acts as a general base that deprotonates the acceptor residue, which subsequently performs a nucleophilic attack on FAD for flavin transfer.},
doi = {10.1074/jbc.RA119.008261},
journal = {Journal of Biological Chemistry},
number = 37,
volume = 294,
place = {United States},
year = {Fri Jul 26 00:00:00 EDT 2019},
month = {Fri Jul 26 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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