2dkf

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spinqualitylabelsall models PDB ID 2dkf Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
, resolution 2.8Å
Ligands:	,
Gene:	TTHA0252 (Thermus thermophilus)
Related:	2AZ4
Resources:	FirstGlance, OCA, PDBsum, RCSB
Coordinates:	save as pdb, mmCIF, xml

Crystal Structure of TTHA0252 from Thermus thermophilus HB8, a RNA Degradation Protein of the Metallo-beta-lactamase Superfamily

Overview

In bacterial RNA metabolism, mRNA degradation is an important process for gene expression. Recently, a novel ribonuclease (RNase), belonging to the beta-CASP family within the metallo-beta-lactamase superfamily, was identified as a functional homologue of RNase E, a major component for mRNA degradation in Escherichia coli. Here, we have determined the crystal structure of TTHA0252 from Thermus thermophilus HB8, which represents the first report of the tertiary structure of a beta-CASP family protein. TTHA0252 comprises two separate domains: a metallo-beta-lactamase domain and a "clamp" domain. The active site of the enzyme is located in a cleft between the two domains, which includes two zinc ions coordinated by seven conserved residues. Although this configuration is similar to those of other beta-lactamases, TTHA0252 has one conserved His residue characteristic of the beta-CASP family as a ligand. We also detected nuclease activity of TTHA0252 against rRNAs of T. thermophilus. Our results reveal structural and functional aspects of novel RNase E-like enzymes with a beta-CASP fold.

About this Structure

2DKF is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Crystal structure of TTHA0252 from Thermus thermophilus HB8, a RNA degradation protein of the metallo-beta-lactamase superfamily., Ishikawa H, Nakagawa N, Kuramitsu S, Masui R, J Biochem. 2006 Oct;140(4):535-42. Epub 2006 Aug 31. PMID:16945939

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