3ZIT

Crystal structure of the thioredoxin-like protein BC3987 mutant T8A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.18 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.144 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Tuning of Thioredoxin Redox Properties by Intramolecular Hydrogen Bonds.

Rohr, A.K.Hammerstad, M.Andersson, K.K.

(2013) Plos One 8: 69411

  • DOI: 10.1371/journal.pone.0069411
  • Primary Citation of Related Structures:  3ZIJ

  • PubMed Abstract: 
  • Thioredoxin-like proteins contain a characteristic C-x-x-C active site motif and are involved in a large number of biological processes ranging from electron transfer, cellular redox level maintenance, and regulation of cellular processes. The mechan ...

    Thioredoxin-like proteins contain a characteristic C-x-x-C active site motif and are involved in a large number of biological processes ranging from electron transfer, cellular redox level maintenance, and regulation of cellular processes. The mechanism for deprotonation of the buried C-terminal active site cysteine in thioredoxin, necessary for dissociation of the mixed-disulfide intermediate that occurs under thiol/disulfide mediated electron transfer, is not well understood for all thioredoxin superfamily members. Here we have characterized a 8.7 kD thioredoxin (BC3987) from Bacillus cereus that unlike the typical thioredoxin appears to use the conserved Thr8 side chain near the unusual C-P-P-C active site to increase enzymatic activity by forming a hydrogen bond to the buried cysteine. Our hypothesis is based on biochemical assays and thiolate pKa titrations where the wild type and T8A mutant are compared, phylogenetic analysis of related thioredoxins, and QM/MM calculations with the BC3987 crystal structure as a precursor for modeling of reduced active sites. We suggest that our model applies to other thioredoxin subclasses with similar active site arrangements.


    Organizational Affiliation

    Department of Biosciences, University of Oslo, Oslo, Norway. a.k.rohr@ibv.uio.no




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THIOREDOXIN
A, B
78Bacillus cereus (strain ATCC 14579 / DSM 31 / JCM 2152 / NBRC 15305 / NCIMB 9373 / NRRL B-3711)N/A
Find proteins for Q819J1 (Bacillus cereus (strain ATCC 14579 / DSM 31 / JCM 2152 / NBRC 15305 / NCIMB 9373 / NRRL B-3711))
Go to UniProtKB:  Q819J1
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.18 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.144 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 24.410α = 90.00
b = 99.090β = 91.64
c = 25.160γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
MOSFLMdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-01-23
    Type: Initial release
  • Version 1.1: 2013-01-30
    Type: Structure summary
  • Version 1.2: 2013-08-28
    Type: Database references