2IUE

Pactolus I-domain: Functional Switching of the Rossmann Fold


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST POTENTIAL ENERGY ENSEMBLES 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Pactolus I-Domain: Functional Switching of the Rossmann Fold.

Sen, M.Legge, G.B.

(2007) Proteins 68: 626

  • DOI: 10.1002/prot.21458

  • PubMed Abstract: 
  • Murine Pactolus is a neutrophil-specific single chain glycoprotein that plays a role as an apoptosis marker for macrophages. The extracellular region of the protein shows strong sequence similarities to integrin beta-subunits. Critical sequence modif ...

    Murine Pactolus is a neutrophil-specific single chain glycoprotein that plays a role as an apoptosis marker for macrophages. The extracellular region of the protein shows strong sequence similarities to integrin beta-subunits. Critical sequence modifications differentiate its function when compared to the integrin family. We show experimentally that Pactolus I-domain does not bind divalent metal ions, indicating that ligand binding is not mediated through a metal ion-dependent adhesion site (MIDAS). NMR data was used to map secondary structure and the strand pairing within the beta-sheet to confirm an overall Rossmann fold topology. Homology modeling enhanced by the NMR data was used to determine the overall structure, with two key loop insertions/deletions (insertion 2 and SDL) that distinguish the Pactolus I-domain from the integrin alpha I-domain and beta I-domains. NMR peak exchange broadening is observed due to dimerization, correlating to the beta I-domain and beta propeller heterodimerization region within the integrin headpiece. Two unique N-linked glycosylation sites (Asn151 and Asn230) within this region disrupt dimerization and may account for why Pactolus is not found to associate with an alpha-subunit. These changes in quaternary structure, ligand binding loops, glycosylation, and metal sites illustrate how evolution has rapidly and effectively altered key aspects of the integrin beta-subunit to derive a protein of novel function on an existing protein scaffold.


    Organizational Affiliation

    Department of Biology and Biochemistry, University of Houston, 4800 Calhoun, Houston, Texas 77204-5001, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INTEGRIN BETA-2-LIKE PROTEIN
A
212Mus musculusMutation(s): 0 
Gene Names: Itgb2l
Find proteins for Q3UV74 (Mus musculus)
Go to UniProtKB:  Q3UV74
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST POTENTIAL ENERGY ENSEMBLES 
  • Olderado: 2IUE Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-06-02 
  • Released Date: 2007-06-05 
  • Deposition Author(s): Sen, M., Legge, G.B.

Revision History 

  • Version 1.0: 2007-06-05
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance