apo structure of 2-hydroxybiphenyl 3-monooxygenase HbpA

Experimental Data Snapshot

  • Resolution: 2.76 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

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Structures of the Apo and Fad-Bound Forms of 2-Hydroxybiphenyl 3-Monooxygenase (Hbpa) Locate Activity Hotspots Identified by Using Directed Evolution.

Jensen, C.N.Mielke, T.Farrugia, J.E.Frank, A.Man, H.Hart, S.Turkenburg, J.P.Grogan, G.

(2015) Chembiochem 16: 968

  • DOI: https://doi.org/10.1002/cbic.201402701
  • Primary Citation of Related Structures:  
    4CY6, 4CY8

  • 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.

  • Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York, YO10 5DD (UK).

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
586Pseudomonas nitroreducens HBP1Mutation(s): 1 
Find proteins for O06647 (Pseudomonas nitroreducens)
Explore O06647 
Go to UniProtKB:  O06647
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO06647
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.76 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.35α = 115.03
b = 94.67β = 96.09
c = 99.16γ = 109.59
Software Package:
Software NamePurpose
xia2data reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-18
    Type: Initial release
  • Version 1.1: 2015-04-22
    Changes: Database references