A low-barrier hydrogen bond mediates antibiotic resistance in a noncanonical catalytic triad
Abstract
One group of enzymes that confer resistance to aminoglycoside antibiotics through covalent modification belongs to the GCN5-related N-acetyltransferase (GNAT) superfamily. We show how a unique GNAT subfamily member uses a previously unidentified noncanonical catalytic triad, consisting of a glutamic acid, a histidine, and the antibiotic substrate itself, which acts as a nucleophile and attacks the acetyl donor molecule. Neutron diffraction studies allow for unambiguous identification of a low-barrier hydrogen bond, predicted in canonical catalytic triads to increase basicity of the histidine. This work highlights the role of this unique catalytic triad in mediating antibiotic resistance while providing new insights into the design of the next generation of aminoglycosides.
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. of Neutron Science. Graduate School of Genome Science and Technology
- Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. of Neutron Science. Graduate School of Genome Science and Technology; National Science Foundation (NSF), Alexandria, VA (United States); Univ. of Tennessee, Knoxville, TN (United States). Dept. of Biochemistry and Cellular and Molecular Biology
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Sciences Directorate
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1625990
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science Advances
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2375-2548
- Publisher:
- AAAS
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 60 APPLIED LIFE SCIENCES; Science & Technology - Other Topics
Citation Formats
Kumar, Prashasti, Serpersu, Engin H., and Cuneo, Matthew J. A low-barrier hydrogen bond mediates antibiotic resistance in a noncanonical catalytic triad. United States: N. p., 2018.
Web. doi:10.1126/sciadv.aas8667.
Kumar, Prashasti, Serpersu, Engin H., & Cuneo, Matthew J. A low-barrier hydrogen bond mediates antibiotic resistance in a noncanonical catalytic triad. United States. https://doi.org/10.1126/sciadv.aas8667
Kumar, Prashasti, Serpersu, Engin H., and Cuneo, Matthew J. Sun .
"A low-barrier hydrogen bond mediates antibiotic resistance in a noncanonical catalytic triad". United States. https://doi.org/10.1126/sciadv.aas8667. https://www.osti.gov/servlets/purl/1625990.
@article{osti_1625990,
title = {A low-barrier hydrogen bond mediates antibiotic resistance in a noncanonical catalytic triad},
author = {Kumar, Prashasti and Serpersu, Engin H. and Cuneo, Matthew J.},
abstractNote = {One group of enzymes that confer resistance to aminoglycoside antibiotics through covalent modification belongs to the GCN5-related N-acetyltransferase (GNAT) superfamily. We show how a unique GNAT subfamily member uses a previously unidentified noncanonical catalytic triad, consisting of a glutamic acid, a histidine, and the antibiotic substrate itself, which acts as a nucleophile and attacks the acetyl donor molecule. Neutron diffraction studies allow for unambiguous identification of a low-barrier hydrogen bond, predicted in canonical catalytic triads to increase basicity of the histidine. This work highlights the role of this unique catalytic triad in mediating antibiotic resistance while providing new insights into the design of the next generation of aminoglycosides.},
doi = {10.1126/sciadv.aas8667},
journal = {Science Advances},
number = 4,
volume = 4,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2018},
month = {Sun Apr 01 00:00:00 EDT 2018}
}
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