4Y8A

Crystal Structure of the N-terminal domain of CEACAM6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

wwPDB Validation   3D Report Full Report


This is version 2.0 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:  
    4Y8A, 4Y88, 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)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Carcinoembryonic antigen-related cell adhesion molecule 6A, B108Homo sapiensMutation(s): 0 
Gene Names: CEACAM6NCA
UniProt & NIH Common Fund Data Resources
Find proteins for P40199 (Homo sapiens)
Explore P40199 
Go to UniProtKB:  P40199
PHAROS:  P40199
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.83 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.66α = 90
b = 96.66β = 90
c = 54.36γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
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
  • Version 2.0: 2018-01-24
    Changes: Advisory, Atomic model, Database references, Derived calculations