2v27 | pdb_00002v27

Structure of the cold active phenylalanine hydroxylase from Colwellia psychrerythraea 34H

spinqualitylabelsall models 2v27, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2v27 is a 2 chain structure with sequence from Colp3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FE, SO4 Activity: Phenylalanine 4-monooxygenase, with EC number 1.14.16.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The characteristic of cold-adapted enzymes, high catalytic efficiency at low temperatures, is often associated with low thermostability and high flexibility. In this context, we analyzed the catalytic properties and solved the crystal structure of phenylalanine hydroxylase from the psychrophilic bacterium Colwellia psychrerythraea 34H (CpPAH). CpPAH displays highest activity with tetrahydrobiopterin (BH(4)) as cofactor and at 25 degrees C (15 degrees C above the optimal growth temperature). Although the enzyme is monomeric with a single L-Phe-binding site, the substrate binds cooperatively. In comparison with PAH from mesophilic bacteria and mammalian organisms, CpPAH shows elevated [S(0.5)](L-Phe) (= 1.1 +/- 0.1 mm) and K(m)(BH(4))(= 0.3 +/- 0.1 mm), as well as high catalytic efficiency at 10 degrees C. However, the half-inactivation and denaturation temperature is only slightly lowered (T(m) approximately 52 degrees C; where T(m) is half-denaturation temperature), in contrast to other cold-adapted enzymes. The crystal structure shows regions of local flexibility close to the highly solvent accessible binding sites for BH(4) (Gly(87)/Phe(88)/Gly(89)) and l-Phe (Tyr(114)-Pro(118)). Normal mode and COREX analysis also detect these and other areas with high flexibility. Greater mobility around the active site and disrupted hydrogen bonding abilities for the cofactor appear to represent cold-adaptive properties that do not markedly affect the thermostability of CpPAH. Structure of phenylalanine hydroxylase from Colwellia psychrerythraea 34H, a monomeric cold active enzyme with local flexibility around the active site and high overall stability.,Leiros HK, Pey AL, Innselset M, Moe E, Leiros I, Steen IH, Martinez A J Biol Chem. 2007 Jul 27;282(30):21973-86. Epub 2007 May 30. PMID:17537732 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hydroxylases 3D structures

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