1jmx | pdb_00001jmx
crystal structure of a quinohemoprotein amine dehydrogenase from pseudomonas putida
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Overview
The crystal structure of a quinohemoprotein amine dehydrogenase from Pseudomonas putida has been determined at 1.9-A resolution. The enzyme comprises three non-identical subunits: a four-domain alpha-subunit that harbors a di-heme cytochrome c, a seven-bladed beta-propeller beta-subunit that provides part of the active site, and a small gamma-subunit that contains a novel cross-linked, proteinous quinone cofactor, cysteine tryptophylquinone. More surprisingly, the catalytic gamma-subunit contains three additional chemical cross-links that encage the cysteine tryptophylquinone cofactor, involving a cysteine side chain bridged to either an Asp or Glu residue all in a hitherto unknown thioether bonding with a methylene carbon atom of acidic amino acid side chains. Thus, the structure of the 79-residue gamma-subunit is quite unusual, containing four internal cross-links in such a short polypeptide chain that would otherwise be difficult to fold into a globular structure.
About this Structure
1JMX is a Protein complex structure of sequences from Pseudomonas putida with NI and HEC as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structure of quinohemoprotein amine dehydrogenase from Pseudomonas putida. Identification of a novel quinone cofactor encaged by multiple thioether cross-bridges., Satoh A, Kim JK, Miyahara I, Devreese B, Vandenberghe I, Hacisalihoglu A, Okajima T, Kuroda S, Adachi O, Duine JA, Van Beeumen J, Tanizawa K, Hirotsu K, J Biol Chem. 2002 Jan 25;277(4):2830-4. Epub 2001 Nov 9. PMID:11704672
Page seeded by OCA on Thu Feb 21 13:24:24 2008
