4CY6

apo structure of 2-hydroxybiphenyl 3-monooxygenase HbpA

Summary for 4CY6

• Entry DOI: 10.2210/pdb4cy6/pdb
• Descriptor: 2-HYDROXYBIPHENYL-3-MONOOXYGENASE (2 entities in total)
• Functional Keywords: oxidoreductase, flavoprotein, fad, hydroxylation, flavin, nadh
• Biological source: PSEUDOMONAS NITROREDUCENS HBP1
• Total number of polymer chains: 4
• Total formula weight: 255453.47

Authors

Jensen, C.N.,Farrugia, J.E.,Frank, A.,Man, H.,Hart, S.,Turkenburg, J.P.,Grogan, G. (deposition date: 2014-04-10, release date: 2015-03-18, Last modification date: 2023-12-20)

Primary citation

Jensen, C.N.,Mielke, T.,Farrugia, J.E.,Frank, A.,Man, H.,Hart, S.,Turkenburg, J.P.,Grogan, G.
Structures of the Apo and Fad-Bound Forms of 2-Hydroxybiphenyl 3-Monooxygenase (Hbpa) Locate Activity Hotspots Identified by Using Directed Evolution.
Chembiochem, 16:968-, 2015

PubMed Abstract: The FAD-dependent monooxygenase HbpA from Pseudomonas azelaica HBP1 catalyses the hydroxylation of 2-hydroxybiphenyl (2HBP) to 2,3-dihydroxybiphenyl (23DHBP). HbpA has been used extensively as a model for studying flavoprotein hydroxylases under process conditions, and has also been subjected to directed-evolution experiments that altered its catalytic properties. The structure of HbpA has been determined in its apo and FAD-complex forms to resolutions of 2.76 and 2.03 Å, respectively. Comparisons of the HbpA structure with those of homologues, in conjunction with a model of the reaction product in the active site, reveal His48 as the most likely acid/base residue to be involved in the hydroxylation mechanism. Mutation of His48 to Ala resulted in an inactive enzyme. The structures of HbpA also provide evidence that mutants achieved by directed evolution that altered activity are comparatively remote from the substrate-binding site.

PubMed: 25737306
DOI: 10.1002/CBIC.201402701

Experimental method

X-RAY DIFFRACTION (2.76 Å)