3MMH

X-ray structure of free methionine-R-sulfoxide reductase from neisseria meningitidis in complex with its substrate

Summary for 3MMH

• Entry DOI: 10.2210/pdb3mmh/pdb
• Descriptor: Methionine-R-sulfoxide reductase, METHIONINE SULFOXIDE, MAGNESIUM ION, ... (6 entities in total)
• Functional Keywords: oxidoreductase
• Biological source: Neisseria meningitidis
• Total number of polymer chains: 2
• Total formula weight: 37506.96

Authors

Gruez, A.,Libiad, M.,Boschi-Muller, S.,Branlant, G. (deposition date: 2010-04-19, release date: 2010-05-19, Last modification date: 2025-03-26)

Primary citation

Gruez, A.,Libiad, M.,Boschi-Muller, S.,Branlant, G.
Structural and Biochemical Characterization of Free Methionine-R-sulfoxide Reductase from Neisseria meningitidis.
J.Biol.Chem., 285:25033-25043, 2010

PubMed Abstract: A new family of methionine-sulfoxide reductase (Msr) was recently described. The enzyme, named fRMsr, selectively reduces the R isomer at the sulfoxide function of free methionine sulfoxide (Met-R-O). The fRMsrs belong to the GAF fold family. They represent the first GAF domain to show enzymatic activity. Two other Msr families, MsrA and MsrB, were already known. MsrA and MsrB reduce free Met-S-O and Met-R-O, respectively, but exhibit higher catalytic efficiency toward Met-O within a peptide or a protein context. The fold of the three families differs. In the present work, the crystal structure of the fRMsr from Neisseria meningitidis has been determined in complex with S-Met-R-O. Based on biochemical and kinetic data as well as genomic analyses, Cys(118) is demonstrated to be the catalytic Cys on which a sulfenic acid is formed. All of the structural factors involved in the stereoselectivity of the l-Met-R-O binding were identified and account for why Met-S-O, DMSO, and a Met-O within a peptide are not substrates. Taking into account the structural, enzymatic, and biochemical information, a scenario of the catalysis for the reductase step is proposed. Based on the thiol content before and after Met-O reduction and the stoichiometry of Met formed per subunit of wild type and Cys-to-Ala mutants, a scenario of the recycling process of the N. meningitidis fRMsr is proposed. All of the biochemical, enzymatic, and structural properties of the N. meningitidis fRMsr are compared with those of MsrA and MsrB and are discussed in terms of the evolution of function of the GAF domain.

PubMed: 20489204
DOI: 10.1074/jbc.M110.134528

Experimental method

X-RAY DIFFRACTION (1.25 Å)