Non-canonical active site architecture of the radical SAM thiamin pyrimidine synthase
Abstract
Radical S-adenosylmethionine (SAM) enzymes use a [4Fe-4S] cluster to generate a 5'-deoxyadenosyl radical. Canonical radical SAM enzymes are characterized by a β-barrel-like fold and SAM anchors to the differentiated iron of the cluster, which is located near the amino terminus and within the β-barrel, through its amino and carboxylate groups. Here we show that ThiC, the thiamin pyrimidine synthase in plants and bacteria, contains a tethered cluster-binding domain at its carboxy terminus that moves in and out of the active site during catalysis. In contrast to canonical radical SAM enzymes, we predict that SAM anchors to an additional active site metal through its amino and carboxylate groups. Superimposition of the catalytic domains of ThiC and glutamate mutase shows that these two enzymes share similar active site architectures, thus providing strong evidence for an evolutionary link between the radical SAM and adenosylcobalamin-dependent enzyme superfamilies.
- Authors:
-
- Cornell Univ., Ithaca, NY (United States). Dept. of Chemistry and Chemical Biology.
- Texas A&M University, College Station, TX (United States). Dept. of Chemistry.
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Institutes of Health (NIH)
- OSTI Identifier:
- 1177427
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 6; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Fenwick, Michael K., Mehta, Angad P., Zhang, Yang, Abdelwahed, Sameh H., Begley, Tadhg P., and Ealick, Steven E. Non-canonical active site architecture of the radical SAM thiamin pyrimidine synthase. United States: N. p., 2015.
Web. doi:10.1038/ncomms7480.
Fenwick, Michael K., Mehta, Angad P., Zhang, Yang, Abdelwahed, Sameh H., Begley, Tadhg P., & Ealick, Steven E. Non-canonical active site architecture of the radical SAM thiamin pyrimidine synthase. United States. https://doi.org/10.1038/ncomms7480
Fenwick, Michael K., Mehta, Angad P., Zhang, Yang, Abdelwahed, Sameh H., Begley, Tadhg P., and Ealick, Steven E. Fri .
"Non-canonical active site architecture of the radical SAM thiamin pyrimidine synthase". United States. https://doi.org/10.1038/ncomms7480. https://www.osti.gov/servlets/purl/1177427.
@article{osti_1177427,
title = {Non-canonical active site architecture of the radical SAM thiamin pyrimidine synthase},
author = {Fenwick, Michael K. and Mehta, Angad P. and Zhang, Yang and Abdelwahed, Sameh H. and Begley, Tadhg P. and Ealick, Steven E.},
abstractNote = {Radical S-adenosylmethionine (SAM) enzymes use a [4Fe-4S] cluster to generate a 5'-deoxyadenosyl radical. Canonical radical SAM enzymes are characterized by a β-barrel-like fold and SAM anchors to the differentiated iron of the cluster, which is located near the amino terminus and within the β-barrel, through its amino and carboxylate groups. Here we show that ThiC, the thiamin pyrimidine synthase in plants and bacteria, contains a tethered cluster-binding domain at its carboxy terminus that moves in and out of the active site during catalysis. In contrast to canonical radical SAM enzymes, we predict that SAM anchors to an additional active site metal through its amino and carboxylate groups. Superimposition of the catalytic domains of ThiC and glutamate mutase shows that these two enzymes share similar active site architectures, thus providing strong evidence for an evolutionary link between the radical SAM and adenosylcobalamin-dependent enzyme superfamilies.},
doi = {10.1038/ncomms7480},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {Fri Mar 27 00:00:00 EDT 2015},
month = {Fri Mar 27 00:00:00 EDT 2015}
}
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