1B3J

STRUCTURE OF THE MHC CLASS I HOMOLOG MIC-A, A GAMMADELTA T CELL LIGAND


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 

wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Crystal structure of the MHC class I homolog MIC-A, a gammadelta T cell ligand.

Li, P.Willie, S.T.Bauer, S.Morris, D.L.Spies, T.Strong, R.K.

(1999) Immunity 10: 577-584

  • DOI: https://doi.org/10.1016/s1074-7613(00)80057-6
  • Primary Citation of Related Structures:  
    1B3J

  • PubMed Abstract: 

    The major histocompatibility complex (MHC) class I homolog MIC-A functions as a stress-inducible antigen that is recognized by a subset of gammadelta T cells independent of beta2-microglobulin and bound peptides. Its crystal structure reveals a dramatically altered MHC class I fold, both in detail and overall domain organization. The only remnant of a peptide-binding groove is a small cavity formed as the result of disordering a large section of one of the groove-defining helices. Loss of beta2-microglobulin binding is due to a restructuring of the interaction interfaces. Structural mapping of sequence variation suggests potential receptor binding sites on the underside of the platform on the side opposite of the surface recognized by alphabeta T cell receptors on MHC class I-peptide complexes.


  • Organizational Affiliation

    Division of Basic Science, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MHC CLASS I HOMOLOG MIC-A274Homo sapiensMutation(s): 0 
Gene Names: MICA-001
UniProt & NIH Common Fund Data Resources
Find proteins for Q29983 (Homo sapiens)
Explore Q29983 
Go to UniProtKB:  Q29983
PHAROS:  Q29983
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ29983
Glycosylation
Glycosylation Sites: 1Go to GlyGen: Q29983-1
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 
  • Space Group: F 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 261.5α = 90
b = 261.5β = 90
c = 261.5γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CCP4model building
X-PLORrefinement
CCP4phasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-07-09
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-12-27
    Changes: Data collection, Database references, Structure summary
  • Version 2.2: 2024-10-09
    Changes: Structure summary