Covalently linked HslU hexamers support a probabilistic mechanism that links ATP hydrolysis to protein unfolding and translocation
Abstract
The HslUV proteolytic machine consists of HslV, a double-ring self-compartmentalized peptidase, and one or two AAA+ HslU ring hexamers that hydrolyze ATP to power the unfolding of protein substrates and their translocation into the proteolytic chamber of HslV. Furthermore, we use genetic tethering and disulfide bonding strategies to construct HslU pseudohexamers containing mixtures of ATPase active and inactive subunits at defined positions in the hexameric ring. Genetic tethering impairs HslV binding and degradation, even for pseudohexamers with six active subunits, but disulfide-linked pseudohexamers do not have these defects, indicating that the peptide tether interferes with HslV interactions. Importantly, pseudohexamers containing different patterns of hydrolytically active and inactive subunits retain the ability to unfold protein substrates and/or collaborate with HslV in their degradation, supporting a model in which ATP hydrolysis and linked mechanical function in the HslU ring operate by a probabilistic mechanism.
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Takeda Pharmaceuticals, Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Stony Brook Univ., NY (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Stanford Univ., CA (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Inst. of Health
- OSTI Identifier:
- 1430301
- Grant/Contract Number:
- AI-16892
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Biological Chemistry
- Additional Journal Information:
- Journal Volume: 292; Journal Issue: 14; Journal ID: ISSN 0021-9258
- Publisher:
- American Society for Biochemistry and Molecular Biology
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; ATP-dependent protease; ATPases associated with diverse cellular activities (AAA); crystal structure; protein engineering; protein turnover; AAA+ protease; mixed hexameric rings; protein unfolding; protein degradation; HslUV
Citation Formats
Baytshtok, Vladimir, Chen, Jiejin, Glynn, Steven E., Nager, Andrew R., Grant, Robert A., Baker, Tania A., and Sauer, Robert T. Covalently linked HslU hexamers support a probabilistic mechanism that links ATP hydrolysis to protein unfolding and translocation. United States: N. p., 2017.
Web. doi:10.1074/jbc.M116.768978.
Baytshtok, Vladimir, Chen, Jiejin, Glynn, Steven E., Nager, Andrew R., Grant, Robert A., Baker, Tania A., & Sauer, Robert T. Covalently linked HslU hexamers support a probabilistic mechanism that links ATP hydrolysis to protein unfolding and translocation. United States. https://doi.org/10.1074/jbc.M116.768978
Baytshtok, Vladimir, Chen, Jiejin, Glynn, Steven E., Nager, Andrew R., Grant, Robert A., Baker, Tania A., and Sauer, Robert T. Tue .
"Covalently linked HslU hexamers support a probabilistic mechanism that links ATP hydrolysis to protein unfolding and translocation". United States. https://doi.org/10.1074/jbc.M116.768978. https://www.osti.gov/servlets/purl/1430301.
@article{osti_1430301,
title = {Covalently linked HslU hexamers support a probabilistic mechanism that links ATP hydrolysis to protein unfolding and translocation},
author = {Baytshtok, Vladimir and Chen, Jiejin and Glynn, Steven E. and Nager, Andrew R. and Grant, Robert A. and Baker, Tania A. and Sauer, Robert T.},
abstractNote = {The HslUV proteolytic machine consists of HslV, a double-ring self-compartmentalized peptidase, and one or two AAA+ HslU ring hexamers that hydrolyze ATP to power the unfolding of protein substrates and their translocation into the proteolytic chamber of HslV. Furthermore, we use genetic tethering and disulfide bonding strategies to construct HslU pseudohexamers containing mixtures of ATPase active and inactive subunits at defined positions in the hexameric ring. Genetic tethering impairs HslV binding and degradation, even for pseudohexamers with six active subunits, but disulfide-linked pseudohexamers do not have these defects, indicating that the peptide tether interferes with HslV interactions. Importantly, pseudohexamers containing different patterns of hydrolytically active and inactive subunits retain the ability to unfold protein substrates and/or collaborate with HslV in their degradation, supporting a model in which ATP hydrolysis and linked mechanical function in the HslU ring operate by a probabilistic mechanism.},
doi = {10.1074/jbc.M116.768978},
journal = {Journal of Biological Chemistry},
number = 14,
volume = 292,
place = {United States},
year = {Tue Feb 21 00:00:00 EST 2017},
month = {Tue Feb 21 00:00:00 EST 2017}
}
Web of Science
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