4Y88

Crystal structure of the N-terminal domain of CEACAM8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 

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This is version 1.2 of the entry. See complete history


Literature

Diverse oligomeric states of CEACAM IgV domains.

Bonsor, D.A.Gunther, S.Beadenkopf, R.Beckett, D.Sundberg, E.J.

(2015) Proc Natl Acad Sci U S A 112: 13561-13566

  • DOI: 10.1073/pnas.1509511112
  • Primary Citation of Related Structures:  
    4Y88, 4Y8A, 4YIQ

  • PubMed Abstract: 
  • Carcinoembryonic antigen-related cell adhesion molecules (CEACAMs) comprise a large family of cell surface adhesion molecules that bind to themselves and other family members to carry out numerous cellular functions, including proliferation, signaling, differentiation, tumor suppression, and survival ...

    Carcinoembryonic antigen-related cell adhesion molecules (CEACAMs) comprise a large family of cell surface adhesion molecules that bind to themselves and other family members to carry out numerous cellular functions, including proliferation, signaling, differentiation, tumor suppression, and survival. They also play diverse and significant roles in immunity and infection. The formation of CEACAM oligomers is caused predominantly by interactions between their N-terminal IgV domains. Although X-ray crystal structures of CEACAM IgV domain homodimers have been described, how CEACAMs form heterodimers or remain monomers is poorly understood. To address this key aspect of CEACAM function, we determined the crystal structures of IgV domains that form a homodimeric CEACAM6 complex, monomeric CEACAM8, and a heterodimeric CEACAM6-CEACAM8 complex. To confirm and quantify these interactions in solution, we used analytical ultracentrifugation to measure the dimerization constants of CEACAM homodimers and isothermal titration calorimetry to determine the thermodynamic parameters and binding affinities of CEACAM heterodimers. We found the CEACAM6-CEACAM8 heterodimeric state to be substantially favored energetically relative to the CEACAM6 homodimer. Our data provide a molecular basis for the adoption of the diverse oligomeric states known to exist for CEACAMs and suggest ways in which CEACAM6 and CEACAM8 regulate the biological functions of one another, as well as of additional CEACAMs with which they interact, both in cis and in trans.


    Organizational Affiliation

    Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201; Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201; Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201 esundberg@ihv.umaryland.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Carcinoembryonic antigen-related cell adhesion molecule 8A108Homo sapiensMutation(s): 0 
Gene Names: CEACAM8CGM6
UniProt & NIH Common Fund Data Resources
Find proteins for P31997 (Homo sapiens)
Explore P31997 
Go to UniProtKB:  P31997
PHAROS:  P31997
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31997
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.336α = 90
b = 94.336β = 90
c = 94.336γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-07
    Type: Initial release
  • Version 1.1: 2015-11-04
    Changes: Database references
  • Version 1.2: 2015-11-11
    Changes: Database references