An allosteric model for control of pore opening by substrate binding in the E ut L microcompartment shell protein
Abstract
Abstract The ethanolamine utilization (Eut) microcompartment is a protein‐based metabolic organelle that is strongly associated with pathogenesis in bacteria that inhabit the human gut. The exterior shell of this elaborate protein complex is composed from a few thousand copies of BMC‐domain shell proteins, which form a semi‐permeable diffusion barrier that provides the interior enzymes with substrates and cofactors while simultaneously retaining metabolic intermediates. The ability of this protein shell to regulate passage of substrate and cofactor molecules is critical for microcompartment function, but the details of how this diffusion barrier can allow the passage of large cofactors while still retaining small intermediates remain unclear. Previous work has revealed two conformations of the EutL shell protein, providing substantial evidence for a gated pore that might allow the passage of large cofactors. Here we report structural and biophysical evidence to show that ethanolamine, the substrate of the Eut microcompartment, acts as a negative allosteric regulator of EutL pore opening. Specifically, a series of X‐ray crystal structures of EutL from Clostridium perfringens , along with equilibrium binding studies, reveal that ethanolamine binds to EutL at a site that exists in the closed‐pore conformation and which is incompatible with opening of the large poremore »
- Authors:
-
- Department of Chemistry and Biochemistry University of California Los Angeles California 90095
- UCLA‐DOE Institute for Genomics and Proteomics, University of California Los Angeles California 90095
- Department of Chemistry and Biochemistry University of California Los Angeles California 90095, UCLA‐DOE Institute for Genomics and Proteomics, University of California Los Angeles California 90095
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1400910
- Grant/Contract Number:
- DE‐FC02‐02ER63421
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Protein Science
- Additional Journal Information:
- Journal Name: Protein Science Journal Volume: 24 Journal Issue: 6; Journal ID: ISSN 0961-8368
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Thompson, Michael C., Cascio, Duilio, Leibly, David J., and Yeates, Todd O. An allosteric model for control of pore opening by substrate binding in the E ut L microcompartment shell protein. United Kingdom: N. p., 2015.
Web. doi:10.1002/pro.2672.
Thompson, Michael C., Cascio, Duilio, Leibly, David J., & Yeates, Todd O. An allosteric model for control of pore opening by substrate binding in the E ut L microcompartment shell protein. United Kingdom. https://doi.org/10.1002/pro.2672
Thompson, Michael C., Cascio, Duilio, Leibly, David J., and Yeates, Todd O. Tue .
"An allosteric model for control of pore opening by substrate binding in the E ut L microcompartment shell protein". United Kingdom. https://doi.org/10.1002/pro.2672.
@article{osti_1400910,
title = {An allosteric model for control of pore opening by substrate binding in the E ut L microcompartment shell protein},
author = {Thompson, Michael C. and Cascio, Duilio and Leibly, David J. and Yeates, Todd O.},
abstractNote = {Abstract The ethanolamine utilization (Eut) microcompartment is a protein‐based metabolic organelle that is strongly associated with pathogenesis in bacteria that inhabit the human gut. The exterior shell of this elaborate protein complex is composed from a few thousand copies of BMC‐domain shell proteins, which form a semi‐permeable diffusion barrier that provides the interior enzymes with substrates and cofactors while simultaneously retaining metabolic intermediates. The ability of this protein shell to regulate passage of substrate and cofactor molecules is critical for microcompartment function, but the details of how this diffusion barrier can allow the passage of large cofactors while still retaining small intermediates remain unclear. Previous work has revealed two conformations of the EutL shell protein, providing substantial evidence for a gated pore that might allow the passage of large cofactors. Here we report structural and biophysical evidence to show that ethanolamine, the substrate of the Eut microcompartment, acts as a negative allosteric regulator of EutL pore opening. Specifically, a series of X‐ray crystal structures of EutL from Clostridium perfringens , along with equilibrium binding studies, reveal that ethanolamine binds to EutL at a site that exists in the closed‐pore conformation and which is incompatible with opening of the large pore for cofactor transport. The allosteric mechanism we propose is consistent with the cofactor requirements of the Eut microcompartment, leading to a new model for EutL function. Furthermore, our results suggest the possibility of redox modulation of the allosteric mechanism, opening potentially new lines of investigation.},
doi = {10.1002/pro.2672},
journal = {Protein Science},
number = 6,
volume = 24,
place = {United Kingdom},
year = {Tue Mar 31 00:00:00 EDT 2015},
month = {Tue Mar 31 00:00:00 EDT 2015}
}
https://doi.org/10.1002/pro.2672
Web of Science
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