Crystal structure of the mutant of HpaB (T198I, A276G, and R466H)

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.195 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Crystal Structure of the Oxygenase Component (HpaB) of the 4-Hydroxyphenylacetate 3-Monooxygenase from Thermus thermophilus HB8

Kim, S.-H.Hisano, T.Takeda, K.Iwasaki, W.Ebihara, A.Miki, K.

(2007) J Biol Chem 282: 33107-33117

  • DOI: https://doi.org/10.1074/jbc.M703440200
  • Primary Citation of Related Structures:  
    2YYG, 2YYI, 2YYJ, 2YYK, 2YYL, 2YYM

  • PubMed Abstract: 

    The 4-hydroxyphenylacetate (4HPA) 3-monooxygenase is involved in the initial step of the 4HPA degradation pathway and catalyzes 4HPA hydroxylation to 3,4-dihydroxyphenylacetate. This enzyme consists of two components, an oxygenase (HpaB) and a reductase (HpaC). To understand the structural basis of the catalytic mechanism of HpaB, crystal structures of HpaB from Thermus thermophilus HB8 were determined in three states: a ligand-free form, a binary complex with FAD, and a ternary complex with FAD and 4HPA. Structural analysis revealed that the binding and dissociation of flavin are accompanied by conformational changes of the loop between beta5 and beta6 and of the loop between beta8 and beta9, leading to preformation of part of the substrate-binding site (Ser-197 and Thr-198). The latter loop further changes its conformation upon binding of 4HPA and obstructs the active site from the bulk solvent. Arg-100 is located adjacent to the putative oxygen-binding site and may be involved in the formation and stabilization of the C4a-hydroperoxyflavin intermediate.

  • Organizational Affiliation

    SPring-8 Center, RIKEN Harima Institute, Koto 1-1-1, Sayo-cho, Sayo-gun, Hyogo, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
4-hydroxyphenylacetate-3-hydroxylase481Thermus thermophilus HB8Mutation(s): 3 
Find proteins for Q5SJP8 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SJP8 
Go to UniProtKB:  Q5SJP8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SJP8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.195 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.819α = 90
b = 99.612β = 90
c = 131.091γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Derived calculations, Source and taxonomy, Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.3: 2024-05-29
    Changes: Data collection