1I9G image
Deposition Date 2001-03-20
Release Date 2001-09-26
Last Version Date 2024-03-13
Entry Detail
PDB ID:
1I9G
Keywords:
Title:
CRYSTAL STRUCTURE OF AN ADOMET DEPENDENT METHYLTRANSFERASE
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.98 Å
R-Value Free:
0.23
R-Value Work:
0.20
Space Group:
I 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:HYPOTHETICAL PROTEIN RV2118C
Chain IDs:A
Chain Length:280
Number of Molecules:1
Biological Source:Mycobacterium tuberculosis
Ligand Molecules
Primary Citation
Crystal structure of Rv2118c: an AdoMet-dependent methyltransferase from Mycobacterium tuberculosis H37Rv.
J.Mol.Biol. 312 381 391 (2001)
PMID: 11554794 DOI: 10.1006/jmbi.2001.4935

Abstact

Rv2118c belongs to the class of conserved hypothetical proteins from Mycobacterium tuberculosis H37Rv. The crystal structure of Rv2118c in complex with S-adenosyl-l-methionine (AdoMet) has been determined at 1.98 A 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 beta-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.

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Primary Citation of related structures