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Plasticity, ligand conformation and enzyme action of Mycobacterium smegmatis MutT1.

Authors
  • Raj, Prateek1
  • Karthik, S1
  • Arif, S M1
  • Varshney, U2
  • Vijayan, M1
  • 1 Molecular Biophysics Unit, Indian Institute of Science, Bengaluru 560 012, India. , (India)
  • 2 Department of Microbiology and Cell Biology, Indian Institute of Science, Bengaluru 560 012, India. , (India)
Type
Published Article
Journal
Acta crystallographica. Section D, Structural biology
Publication Date
Oct 01, 2020
Volume
76
Issue
Pt 10
Pages
982–992
Identifiers
DOI: 10.1107/S2059798320010992
PMID: 33021500
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Mycobacterium smegmatis MutT1 (MsMutT1) is a sanitation enzyme made up of an N-terminal Nudix hydrolase domain and a C-terminal domain resembling a histidine phosphatase. It has been established that the action of MutT1 on 8-oxo-dGTP, 8-oxo-GTP and diadenosine polyphosphates is modulated by intermolecular interactions. In order to further explore this and to elucidate the structural basis of its differential action on 8-oxo-NTPs and unsubstituted NTPs, the crystal structures of complexes of MsMutT1 with 8-oxo-dGTP, GMPPNP and GMPPCP have been determined. Replacement soaking was used in order to ensure that the complexes were isomorphous to one another. Analysis of the structural data led to the elucidation of a relationship between the arrangements of molecules observed in the crystals, molecular plasticity and the action of the enzyme on nucleotides. The dominant mode of arrangement involving a head-to-tail sequence predominantly leads to the generation of NDPs. The other mode of packing arrangement appears to preferentially generate NMPs. This work also provides interesting insights into the dependence of enzyme action on the conformation of the ligand. The possibility of modulating the enzyme action through differences in intermolecular interactions and ligand conformations makes MsMutT1 a versatile enzyme.

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