Endonuclease Activity of MutL Protein of the Rhodobacter sphaeroides Mismatch Repair System
- Authors: Monakhova M.V.1, Penkina A.I.2, Pavlova A.V.2, Lyaschuk A.M.3, Kucherenko V.V.4, Alexeevski A.V.1,5, Lunin V.G.3, Friedhoff P.6, Klug G.7, Oretskaya T.S.2, Kubareva E.A.1
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Affiliations:
- Belozersky Institute of Physico–Chemical Biology
- Chemistry Department
- Gamaleya Research Institute of Epidemiology and Microbiology
- Bioengineering and Bioinformatics Department
- Research Institute of System Development
- Institut für Biochemie
- Institut für Mikrobiologie und Molekularbiologie
- Issue: Vol 83, No 3 (2018)
- Pages: 281-293
- Section: Article
- URL: https://journals.rcsi.science/0006-2979/article/view/151617
- DOI: https://doi.org/10.1134/S0006297918030082
- ID: 151617
Cite item
Abstract
We have purified the MutL protein from Rhodobacter sphaeroides mismatch repair system (rsMutL) for the first time. rsMutL demonstrated endonuclease activity in vitro, as predicted by bioinformatics analysis. Based on the alignment of 1483 sequences of bacterial MutL homologs with presumed endonuclease activity, conserved functional motifs and amino acid residues in the rsMutL sequence were identified: five motifs comprising the catalytic site responsible for DNA cleavage were found in the C–terminal domain; seven conserved motifs involved in ATP binding and hydrolysis and specific to the GHKL family of ATPases were found in the N–terminal domain. rsMutL demonstrated the highest activity in the presence of Mn2+. The extent of plasmid DNA hydrolysis declined in the row Mn2+ > Co2+ > Mg2+ > Cd2+; Ni2+ and Ca2+ did not activate rsMutL. Divalent zinc ions inhibited rsMutL endonuclease activity in the presence of Mn2+ excess. ATP also suppressed plasmid DNA hydrolysis by rsMutL. Analysis of amino acid sequences and biochemical properties of five studied bacterial MutL homologs with endonuclease activity revealed that rsMutL resembles the MutL proteins from Neisseria gonorrhoeae and Pseudomonas aeruginosa.
Keywords
About the authors
M. V. Monakhova
Belozersky Institute of Physico–Chemical Biology
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991
A. I. Penkina
Chemistry Department
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991
A. V. Pavlova
Chemistry Department
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991
A. M. Lyaschuk
Gamaleya Research Institute of Epidemiology and Microbiology
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 123098
V. V. Kucherenko
Bioengineering and Bioinformatics Department
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991
A. V. Alexeevski
Belozersky Institute of Physico–Chemical Biology; Research Institute of System Development
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991; Moscow, 117218
V. G. Lunin
Gamaleya Research Institute of Epidemiology and Microbiology
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 123098
P. Friedhoff
Institut für Biochemie
Email: kubareva@belozersky.msu.ru
Germany, Gieβen, 35392
G. Klug
Institut für Mikrobiologie und Molekularbiologie
Email: kubareva@belozersky.msu.ru
Germany, Gieβen, 35392
T. S. Oretskaya
Chemistry Department
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991
E. A. Kubareva
Belozersky Institute of Physico–Chemical Biology
Author for correspondence.
Email: kubareva@belozersky.msu.ru
Russian Federation, Moscow, 119991
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