4L69: Rv2372c Of Mycobacterium Tuberculosis Is Rsme Like Methyltransferse

Citation:
Abstract
U1498 of 16S rRNA plays an important role in translation fidelity as well as in antibiotic response. U1498 is present in a methylated form in the decoding centre of the ribosome. In this study, Rv2372c from Mycobacterium tuberculosis has been identified as an RsmE-like methyltransferase which specifically methylates U1498 of 16S rRNA at the N3 position and can complement RsmE-deleted Escherichia coli. The crystal structure of Rv2372c has been determined, and reveals that the protein belongs to a distinct class in the SPOUT superfamily and exists as a dimer. The deletion of critical residues at the C-terminus of Rv2372c leads to an inability of the protein to form stable dimers and to abolition of the methyltransferase activity. A ternary model of Rv2372c with its cofactor S-adenosylmethionine (SAM) and the 16S rRNA fragment (1487)16S rRNA(1510) helps to identify binding pockets for SAM (in the deep trefoil knot) and substrate RNA (at the dimer interface) and suggests an SN2 mechanism for the methylation of N3 of U1498 in 16S rRNA.
PDB ID: 4L69Download
MMDB ID: 118424
PDB Deposition Date: 2013/6/12
Updated in MMDB: 2014/03
Experimental Method:
x-ray diffraction
Resolution: 2.9  Å
Source Organism:
Similar Structures:
Biological Unit for 4L69: dimeric; determined by author and by software (PISA)
Molecular Components in 4L69
Label Count Molecule
Proteins (2 molecules)
2
Ribosomal RNA Small Subunit Methyltransferase E
Molecule annotation
* Click molecule labels to explore molecular sequence information.

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