2K8V

Solution structure of Oxidised ERp18


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.1 of the entry. See complete history


Literature

Solution structure and dynamics of ERp18, a small endoplasmic reticulum resident oxidoreductase .

Rowe, M.L.Ruddock, L.W.Kelly, G.Schmidt, J.M.Williamson, R.A.Howard, M.J.

(2009) Biochemistry 48: 4596-4606

  • DOI: 10.1021/bi9003342
  • Primary Citation of Related Structures:  
    2K8V

  • PubMed Abstract: 
  • Here we report the solution structure of oxidized ERp18 as determined using NMR spectroscopy. ERp18 is the smallest member of the protein disulfide isomerase (PDI) family of proteins to contain a Cys-Xxx-Xxx-Cys active site motif. It is an 18 kDa endoplasmic reticulum resident protein with unknown function although sequence similarity to individual domains of the thiol-disulfide oxidoreductase PDI suggests ERp18 may have a similar structure and function ...

    Here we report the solution structure of oxidized ERp18 as determined using NMR spectroscopy. ERp18 is the smallest member of the protein disulfide isomerase (PDI) family of proteins to contain a Cys-Xxx-Xxx-Cys active site motif. It is an 18 kDa endoplasmic reticulum resident protein with unknown function although sequence similarity to individual domains of the thiol-disulfide oxidoreductase PDI suggests ERp18 may have a similar structure and function. Like the catalytic domains of PDI, ERp18 adopts a thioredoxin fold with a thioredoxin-like active site located at the N-terminus of a long kinked helix that spans the length of the protein. Comparison of backbone chemical shifts for oxidized and reduced ERp18 shows the majority of residues possess the same backbone conformation in both states, with differences limited to the active site and regions in close proximity. S(2) order parameters from NMR backbone dynamics were found to be 0.81 for oxidized and 0.91 for reduced ERp18, and these observations, in combination with amide hydrogen exchange rates, imply a more rigid and compact backbone for the reduced structure. These observations support a putative role for ERp18 within the cell as an oxidase, introducing disulfide bonds to substrate proteins, providing structural confirmation of ERp18's role as a thiol-disulfide oxidoreductase.


    Related Citations: 
    • Functional Characterization of ERp18, a New Endoplasmic Reticulum-located Thioredoxin Superfamily Member
      Alanen, H.I., Williamson, R.A., Howard, M.J., Lappi, A., J ntti, H.P., Rautio, S.M., Kellokupu, S., Ruddock, L.W.
      (2003) J Biol Chem 278: 28912

    Organizational Affiliation

    Department of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thioredoxin domain-containing protein 12A157Homo sapiensMutation(s): 0 
Gene Names: TXNDC12TLP19UNQ713/PRO1376
EC: 1.8.4.2
UniProt & NIH Common Fund Data Resources
Find proteins for O95881 (Homo sapiens)
Explore O95881 
Go to UniProtKB:  O95881
PHAROS:  O95881
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2K8V Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance