2K18

Solution structure of bb' domains of human protein disulfide isomerase


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy and the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Solution structure of the bb' domains of human protein disulfide isomerase.

Denisov, A.Y.Maattanen, P.Dabrowski, C.Kozlov, G.Thomas, D.Y.Gehring, K.

(2009) Febs J. 276: 1440-1449

  • DOI: 10.1111/j.1742-4658.2009.06884.x

  • PubMed Abstract: 
  • Protein disulfide isomerase is the most abundant and best studied of the disulfide isomerases that catalyze disulfide bond formation in the endoplasmic reticulum, yet the specifics of how it binds substrate have been elusive. Protein disulfide isomer ...

    Protein disulfide isomerase is the most abundant and best studied of the disulfide isomerases that catalyze disulfide bond formation in the endoplasmic reticulum, yet the specifics of how it binds substrate have been elusive. Protein disulfide isomerase is composed of four thioredoxin-like domains (abb'a'). Cross-linking studies with radiolabeled peptides and unfolded proteins have shown that it binds incompletely folded proteins primarily via its third domain, b'. Here, we determined the solution structure of the second and third domains of human protein disulfide isomerase (b and b', respectively) by triple-resonance NMR spectroscopy and molecular modeling. NMR titrations identified a large hydrophobic surface within the b' domain that binds unfolded ribonuclease A and the peptides mastoparan and somatostatin. Protein disulfide isomerase-catalyzed refolding of reduced ribonuclease A in vitro was inhibited by these peptides at concentrations equal to their affinity to the bb' fragment. Our findings provide a structural basis for previous kinetic and cross-linking studies which have shown that protein disulfide isomerase exhibits a saturable, substrate-binding site.


    Organizational Affiliation

    Department of Biochemistry, McGill University, Montréal, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein disulfide-isomerase
A
228Homo sapiensGene Names: P4HB (ERBA2L, PDI, PDIA1, PO4DB)
EC: 5.3.4.1
Find proteins for P07237 (Homo sapiens)
Go to Gene View: P4HB
Go to UniProtKB:  P07237
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy and the least restraint violations 
  • Olderado: 2K18 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance