4hs1 | pdb_00004hs1

High-resolution crystal structure of Glutaredoxin like protein NrdH from Mycobacterium tuberculosis.

spinqualitylabelsall models 4hs1, resolution 0.87Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4hs1 is a 1 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, GOL, NO3, PEG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function P95106_MYCTO Electron transport system for the ribonucleotide reductase system NrdEF.[ARBA:ARBA00002292] Publication Abstract from PubMed Members of the NrdH family of redox proteins, which consists of small glutaredoxin-like proteins with thioredoxin-like activity, serve as the reducing partners of class Ib ribonucleotide reductases. Here, we report the crystal structure of NrdH from Mycobacterium tuberculosis, refined to a crystallographic R factor of 14.02% (Rfree = 15.53%) at 0.87 A resolution. The tertiary structure of M. tuberculosis NrdH has a typical thioredoxin fold as expected. The extremely high resolution of the structure allows us to dissect the functionality of the protein in great depth. Structural superimposition of M. tuberculosis NrdH and thioredoxin reductase over the Escherichia coli thioredoxin reductase-thioredoxin complex suggests the ability of NrdH to accept electrons from M. tuberculosis thioredoxin reductase. This raises the important question of why glutaredoxins are unable to accept electrons from thioredoxin reductases and why thioredoxins are unable to reduce ribonucleotide reductases. Furthermore, forms of NrdH from other organisms have been shown to be a specific reductant of class Ib ribonucleotide reductases. We attempt to explain this substrate specificity by modeling the C-terminal peptide of a ribunucleotide subunit, NrdE, in the active site of NrdH using the already available Grx-NrdA-Cter-peptide structure. Statistical coupling analysis of NrdH, glutaredoxins, and thioredoxins reveals different sets of co-evolving contiguous clusters of amino acid residues, which might explain the differences in the biochemical properties of these structurally similar yet functionally distinct subclasses of proteins. The Crystal Structure of Mycobacterium tuberculosis NrdH at 0.87 A Suggests a Possible Mode of Its Activity.,Phulera S, Mande SC Biochemistry. 2013 May 28. PMID:23675692 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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