Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

A ribonucleotide reductase from Clostridium botulinum reveals distinct evolutionary pathways to regulation via the overall activity site

Martínez-Carranza, Markel LU ; Jonna, Venkateswara Rao ; Lundin, Daniel ; Sahlin, Margareta ; Carlson, Lars-Anders ; Jemal, Newal ; Högbom, Martin ; Sjöberg, Britt-Marie ; Stenmark, Pål LU orcid and Hofer, Anders (2020) In The Journal of biological chemistry 295(46). p.15576-15587
Abstract

Ribonucleotide reductase (RNR) is a central enzyme for DNA building block synthesis. Most aerobic organisms, including nearly all eukaryotes, have class I RNRs consisting of R1 and R2 subunits. The catalytic R1 subunit contains an overall activity site that can allosterically turn the enzyme on or off by the binding of ATP or dATP, respectively. The mechanism behind the ability to turn the enzyme off via the R1 subunit involves the formation of different types of R1 oligomers in most studied species and R1-R2 octamers in Escherichia coli. To better understand the distribution of different oligomerization mechanisms, we characterized the enzyme from Clostridium botulinum, which belongs to a subclass of class I RNRs not studied before.... (More)

Ribonucleotide reductase (RNR) is a central enzyme for DNA building block synthesis. Most aerobic organisms, including nearly all eukaryotes, have class I RNRs consisting of R1 and R2 subunits. The catalytic R1 subunit contains an overall activity site that can allosterically turn the enzyme on or off by the binding of ATP or dATP, respectively. The mechanism behind the ability to turn the enzyme off via the R1 subunit involves the formation of different types of R1 oligomers in most studied species and R1-R2 octamers in Escherichia coli. To better understand the distribution of different oligomerization mechanisms, we characterized the enzyme from Clostridium botulinum, which belongs to a subclass of class I RNRs not studied before. The recombinantly expressed enzyme was analyzed by size exclusion chromatography, gas-phase electrophoretic mobility macromolecular analysis, electron microscopy, x-ray crystallography, and enzyme assays. Interestingly, it shares the ability of the E. coli RNR to form inhibited R1-R2 octamers in the presence of dATP but, unlike the E. coli enzyme, cannot be turned off by combinations of ATP and dGTP/dTTP. A phylogenetic analysis of class I RNRs suggests that activity regulation is not ancestral, but was gained after the first subclasses diverged and that RNR subclasses with inhibition mechanisms involving R1 oligomerization belong to a clade separated from the two subclasses forming R1-R2 octamers. These results give further insight into activity regulation in class I RNRs as an evolutionarily dynamic process.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of biological chemistry
volume
295
issue
46
pages
12 pages
publisher
American Society for Biochemistry and Molecular Biology
external identifiers
  • scopus:85096203090
  • pmid:32883811
ISSN
1083-351X
DOI
10.1074/jbc.RA120.014895
language
English
LU publication?
yes
additional info
Published under license by The American Society for Biochemistry and Molecular Biology, Inc.
id
d4bdae88-a9bb-45e0-8031-da5483ae4b4c
date added to LUP
2020-09-11 08:43:05
date last changed
2024-06-26 21:58:42
@article{d4bdae88-a9bb-45e0-8031-da5483ae4b4c,
  abstract     = {{<p>Ribonucleotide reductase (RNR) is a central enzyme for DNA building block synthesis. Most aerobic organisms, including nearly all eukaryotes, have class I RNRs consisting of R1 and R2 subunits. The catalytic R1 subunit contains an overall activity site that can allosterically turn the enzyme on or off by the binding of ATP or dATP, respectively. The mechanism behind the ability to turn the enzyme off via the R1 subunit involves the formation of different types of R1 oligomers in most studied species and R1-R2 octamers in Escherichia coli. To better understand the distribution of different oligomerization mechanisms, we characterized the enzyme from Clostridium botulinum, which belongs to a subclass of class I RNRs not studied before. The recombinantly expressed enzyme was analyzed by size exclusion chromatography, gas-phase electrophoretic mobility macromolecular analysis, electron microscopy, x-ray crystallography, and enzyme assays. Interestingly, it shares the ability of the E. coli RNR to form inhibited R1-R2 octamers in the presence of dATP but, unlike the E. coli enzyme, cannot be turned off by combinations of ATP and dGTP/dTTP. A phylogenetic analysis of class I RNRs suggests that activity regulation is not ancestral, but was gained after the first subclasses diverged and that RNR subclasses with inhibition mechanisms involving R1 oligomerization belong to a clade separated from the two subclasses forming R1-R2 octamers. These results give further insight into activity regulation in class I RNRs as an evolutionarily dynamic process.</p>}},
  author       = {{Martínez-Carranza, Markel and Jonna, Venkateswara Rao and Lundin, Daniel and Sahlin, Margareta and Carlson, Lars-Anders and Jemal, Newal and Högbom, Martin and Sjöberg, Britt-Marie and Stenmark, Pål and Hofer, Anders}},
  issn         = {{1083-351X}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{46}},
  pages        = {{15576--15587}},
  publisher    = {{American Society for Biochemistry and Molecular Biology}},
  series       = {{The Journal of biological chemistry}},
  title        = {{A ribonucleotide reductase from Clostridium botulinum reveals distinct evolutionary pathways to regulation via the overall activity site}},
  url          = {{http://dx.doi.org/10.1074/jbc.RA120.014895}},
  doi          = {{10.1074/jbc.RA120.014895}},
  volume       = {{295}},
  year         = {{2020}},
}