Primary Citation of Related Structures: 1CC6, 1CC4
PubMed Abstract:
Phe161 and Arg166 of p-hydroxybenzoate hydroxylase from Pseudomonas fluorescens belong to a newly discovered sequence motif in flavoprotein hydroxylases with a putative dual function in FAD and NADPH binding [1]. To study their role in more detail, Phe16 ...
Phe161 and Arg166 of p-hydroxybenzoate hydroxylase from Pseudomonas fluorescens belong to a newly discovered sequence motif in flavoprotein hydroxylases with a putative dual function in FAD and NADPH binding [1]. To study their role in more detail, Phe161 and Arg166 were selectively changed by site-directed mutagenesis. F161A and F161G are catalytically competent enzymes having a rather poor affinity for NADPH. The catalytic properties of R166K are similar to those of the native enzyme. R166S and R166E show impaired NADPH binding and R166E has lost the ability to bind FAD. The crystal structure of substrate complexed F161A at 2.2 A is indistinguishable from the native enzyme, except for small changes at the site of mutation. The crystal structure of substrate complexed R166S at 2.0 A revealed that Arg166 is important for providing an intimate contact between the FAD binding domain and a long excursion of the substrate binding domain. It is proposed that this interaction is essential for structural stability and for the recognition of the pyrophosphate moiety of NADPH.
Related Citations:
Crystal structure of p-hydroxybenzoate hydroxylase reconstituted with the modified FAD present in alcohol oxidase from methylotrophic yeasts: evidence for an arabinoflavin. van Berkel, W.J., Eppink, M.H., Schreuder, H.A. (1994) Protein Sci 3: 2245
Crystal structures of wild-type p-hydroxybenzoate hydroxylase complexed with 4-aminobenzoate,2,4-dihydroxybenzoate, and 2-hydroxy-4-aminobenzoate and of the Tyr222Ala mutant complexed with 2-hydroxy-4-aminobenzoate. Evidence for a proton channel and a new binding mode of the flavin ring. Schreuder, H.A., Mattevi, A., Obmolova, G., Kalk, K.H., Hol, W.G., van der Bolt, F.J., van Berkel, W.J. (1994) Biochemistry 33: 10161
Crystal structure of the reduced form of p-hydroxybenzoate hydroxylase refined at 2.3 A resolution. Schreuder, H.A., van der Laan, J.M., Swarte, M.B., Kalk, K.H., Hol, W.G., Drenth, J. (1992) Proteins 14: 178
Engineering of microheterogeneity-resistant p-hydroxybenzoate hydroxylase from Pseudomonas fluorescens. Eschrich, K., van Berkel, W.J., Westphal, A.H., de Kok, A., Mattevi, A., Obmolova, G., Kalk, K.H., Hol, W.G. (1990) FEBS Lett 277: 197
Crystal structure of the p-hydroxybenzoate hydroxylase-substrate complex refined at 1.9 A resolution. Analysis of the enzyme-substrate and enzyme-product complexes. Schreuder, H.A., Prick, P.A., Wierenga, R.K., Vriend, G., Wilson, K.S., Hol, W.G., Drenth, J. (1989) J Mol Biol 208: 679
The coenzyme analogue adenosine 5-diphosphoribose displaces FAD in the active site of p-hydroxybenzoate hydroxylase. An x-ray crystallographic investigation. van der Laan, J.M., Schreuder, H.A., Swarte, M.B., Wierenga, R.K., Kalk, K.H., Hol, W.G., Drenth, J. (1989) Biochemistry 28: 7199
Crystal structure of p-hydroxybenzoate hydroxylase complexed with its reaction product 3,4-dihydroxybenzoate. Schreuder, H.A., van der Laan, J.M., Hol, W.G., Drenth, J. (1988) J Mol Biol 199: 637
Crystal structure of p-hydroxybenzoate hydroxylase. Wierenga, R.K., de Jong, R.J., Kalk, K.H., Hol, W.G., Drenth, J. (1979) J Mol Biol 131: 55
Crystallization and preliminary x-ray investigation of p-hydroxybenzoate hydroxylase from Pseudomonas fluorescens. Drenth, J., Hol, W.G., Wierenga, R.K. (1975) J Biol Chem 250: 5268
Organizational Affiliation:
Department of Biomolecular Sciences, Wageningen University Research Centre, The Netherlands.
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