Structural and functional characterizations of a thioredoxin-fold protein from Helicobacter pylori

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

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Structural and functional characterization of HP0377, a thioredoxin-fold protein from Helicobacter pylori

Yoon, J.Y.Kim, J.An, D.R.Lee, S.J.Kim, H.S.Im, H.N.Yoon, H.J.Kim, J.Y.Kim, S.J.Han, B.W.Suh, S.W.

(2013) Acta Crystallogr D Biol Crystallogr 69: 735-746

  • DOI: https://doi.org/10.1107/S0907444913001236
  • Primary Citation of Related Structures:  
    4FYB, 4FYC

  • PubMed Abstract: 

    Maturation of cytochrome c is carried out in the bacterial periplasm, where specialized thiol-disulfide oxidoreductases provide the correct reduction of oxidized apocytochrome c before covalent haem attachment. HP0377 from Helicobacter pylori is a thioredoxin-fold protein that has been implicated as a component of system II for cytochrome c assembly and shows limited sequence similarity to Escherichia coli DsbC, a disulfide-bond isomerase. To better understand the role of HP0377, its crystal structures have been determined in both reduced and partially oxidized states, which are highly similar to each other. Sedimentation-equilibrium experiments indicate that HP0377 is monomeric in solution. HP0377 adopts a thioredoxin fold but shows distinctive variations as in other thioredoxin-like bacterial periplasmic proteins. The active site of HP0377 closely resembles that of E. coli DsbC. A reductase assay suggests that HP0377 may play a role as a reductase in the biogenesis of holocytochrome c553 (HP1227). Binding experiments indicate that it can form a covalent complex with HP0518, a putative L,D-transpeptidase with a catalytic cysteine residue, via a disulfide bond. Furthermore, physicochemical properties of HP0377 and its R86A variant have been determined. These results suggest that HP0377 may perform multiple functions as a reductase in H. pylori.

  • Organizational Affiliation

    Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thiol:disulfide interchange protein (DsbC)A [auth B],
B [auth A]
241Helicobacter pylori 26695Mutation(s): 0 
Gene Names: HP_0377
Find proteins for O25140 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore O25140 
Go to UniProtKB:  O25140
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO25140
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GOL

Download Ideal Coordinates CCD File 
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 133.575α = 90
b = 43.913β = 108.74
c = 80.059γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-08
    Type: Initial release
  • Version 1.1: 2013-09-11
    Changes: Database references