4TW5

Structure Of the First Two Thioredoxin Domains of Saccharomyces cerevisiae Eps1p


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.37 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The eps1p protein disulfide isomerase conserves classic thioredoxin superfamily amino Acid motifs but not their functional geometries.

Biran, S.Gat, Y.Fass, D.

(2014) PLoS One 9: e113431-e113431

  • DOI: 10.1371/journal.pone.0113431
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The widespread thioredoxin superfamily enzymes typically share the following features: a characteristic α-β fold, the presence of a Cys-X-X-Cys (or Cys-X-X-Ser) redox-active motif, and a proline in the cis configuration abutting the redox-active site ...

    The widespread thioredoxin superfamily enzymes typically share the following features: a characteristic α-β fold, the presence of a Cys-X-X-Cys (or Cys-X-X-Ser) redox-active motif, and a proline in the cis configuration abutting the redox-active site in the tertiary structure. The Cys-X-X-Cys motif is at the solvent-exposed amino terminus of an α-helix, allowing the first cysteine to engage in nucleophilic attack on substrates, or substrates to attack the Cys-X-X-Cys disulfide, depending on whether the enzyme functions to reduce, isomerize, or oxidize its targets. We report here the X-ray crystal structure of an enzyme that breaks many of our assumptions regarding the sequence-structure relationship of thioredoxin superfamily proteins. The yeast Protein Disulfide Isomerase family member Eps1p has Cys-X-X-Cys motifs and proline residues at the appropriate primary structural positions in its first two predicted thioredoxin-fold domains. However, crystal structures show that the Cys-X-X-Cys of the second domain is buried and that the adjacent proline is in the trans, rather than the cis isomer. In these configurations, neither the "active-site" disulfide nor the backbone carbonyl preceding the proline is available to interact with substrate. The Eps1p structures thus expand the documented diversity of the PDI oxidoreductase family and demonstrate that conserved sequence motifs in common folds do not guarantee structural or functional conservation.


    Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Eps1p
A, B, C, D
272Saccharomyces cerevisiae JAY291Mutation(s): 0 
Gene Names: EPS1C1Q_00313
EC: 5.4.3.1
Find proteins for C7GJH6 (Saccharomyces cerevisiae (strain JAY291))
Go to UniProtKB:  C7GJH6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.37 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.215 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.026α = 90
b = 133.031β = 92
c = 124.406γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2014-06-30 
  • Released Date: 2014-12-17 
  • Deposition Author(s): Fass, D., Biran, S.

Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union310649
Kimmel Center for Macromolecular AssembliesIsrael--

Revision History 

  • Version 1.0: 2014-12-17
    Type: Initial release
  • Version 1.1: 2016-07-27
    Changes: Data collection
  • Version 1.2: 2020-01-08
    Changes: Author supporting evidence, Derived calculations