Crystal structure of Rv2118c: an AdoMet-dependent methyltransferase from Mycobacterium tuberculosis H37Rv

Gupta, Amrita and Kumar, Hari P and Dineshkumar, TK and Varshney, Umesh and Subramanya, Hosahalli S (2001) Crystal structure of Rv2118c: an AdoMet-dependent methyltransferase from Mycobacterium tuberculosis H37Rv. In: Journal of Molecular Biology, 312 (2). pp. 381-391.

PDF crystal.pdf - Published Version Restricted to Registered users only Download (703kB) | Request a copy

Abstract

Rv2118c belongs to the class of conserved hypothetical proteins from Mycobacterium tuberculosis H37Rv. The crystal structure of Rv2118c in complex with S-adenosyl-Image -methionine (AdoMet) has been determined at 1.98 Å resolution. The crystallographic asymmetric unit consists of a monomer, but symmetry-related subunits interact extensively, leading to a tetrameric structure. The structure of the monomer can be divided functionally into two domains: the larger catalytic C-terminal domain that binds the cofactor AdoMet and is involved in the transfer of methyl group from AdoMet to the substrate and a smaller N-terminal domain. The structure of the catalytic domain is very similar to that of other AdoMet-dependent methyltransferases. The N-terminal domain is primarily a β-structure with a fold not found in other methyltransferases of known structure. Database searches reveal a conserved family of Rv2118c-like proteins from various organisms. Multiple sequence alignments show several regions of high sequence similarity (motifs) in this family of proteins. Structure analysis and homology to yeast Gcd14p suggest that Rv2118c could be an RNA methyltransferase, but further studies are required to establish its functional role conclusively.

Item Type:	Journal Article
Publication:	Journal of Molecular Biology
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	MTase;tRNA;crystal;mycobacterium;AdoMet.
Department/Centre:	Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited:	02 Aug 2011 08:08
Last Modified:	02 Aug 2011 08:08
URI:	http://eprints.iisc.ac.in/id/eprint/39522

Actions (login required)

View Item