1bkw

p-Hydroxybenzoate hydroxylase (phbh) mutant with cys116 replaced by ser (c116s) and arg44 replaced by lys (r44k), in complex with fad and 4-hydroxybenzoic acidp-Hydroxybenzoate hydroxylase (phbh) mutant with cys116 replaced by ser (c116s) and arg44 replaced by lys (r44k), in complex with fad and 4-hydroxybenzoic acid

Structural highlights 1bkw is a 1 chain structure with sequence from Pseudomonas fluorescens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: , Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PHHY_PSEFL 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 Arg44, located at the si-face side of the flavin ring in 4-hydroxybenzoate hydroxylase, was changed to lysine by site-specific mutagenesis. Crystals of [R44K]4-hydroxybenzoate hydroxylase complexed with 4-hydroxybenzoate diffract to 0.22-nm resolution. The structure of [R44K]4-hydroxybenzoate hydroxylase is identical to the wild-type enzyme except for local changes in the vicinity of the mutation. The peptide unit between Ile43 and Lys44 is flipped by about 180 degrees in 50% of the molecules. The phi, psi angles in both the native and flipped conformation are outside the allowed regions and indicate a strained conformation. [R44K]4-Hydroxybenzoate hydroxylase has a decreased affinity for the flavin prosthetic group. This is ascribed to the lost interactions between the side chain of Arg44 and the diphosphoribose moiety of the FAD. The replacement of Arg44 by Lys does not change the position of the flavin ring which occupies the same interior position as in wild type. [R44K]4-Hydroxybenzoate hydroxylase fully couples flavin reduction to substrate hydroxylation. Stopped-flow kinetics showed that the effector role of 4-hydroxybenzoate is largely conserved in the mutant. Replacement of Arg44 by Lys however affects NADPH binding, resulting in a low yield of the charge-transfer species between reduced flavin and NADP+. It is inferred from these data that Arg44 is indispensable for optimal catalysis. Structure and function of mutant Arg44Lys of 4-hydroxybenzoate hydroxylase implications for NADPH binding.,Eppink MH, Schreuder HA, Van Berkel WJ Eur J Biochem. 1995 Jul 1;231(1):157-65. PMID:7628466 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hydroxylases 3D structures

spinqualitylabelsall models 1bkw, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image