1K8D

crystal structure of the non-classical MHC class Ib Qa-2 complexed with a self peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.223 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Promiscuous antigen presentation by the nonclassical MHC Ib Qa-2 is enabled by a shallow, hydrophobic groove and self-stabilized peptide conformation.

He, X.Tabaczewski, P.Ho, J.Stroynowski, I.Garcia, K.C.

(2001) Structure 9: 1213-1224

  • DOI: 10.1016/s0969-2126(01)00689-x
  • Primary Citation of Related Structures:  
    1K8D

  • PubMed Abstract: 
  • Qa-2 is a nonclassical MHC Ib antigen, which has been implicated in both innate and adaptive immune responses, as well as embryonic development. Qa-2 has an unusual peptide binding specificity in that it requires two dominant C-terminal anchor residu ...

    Qa-2 is a nonclassical MHC Ib antigen, which has been implicated in both innate and adaptive immune responses, as well as embryonic development. Qa-2 has an unusual peptide binding specificity in that it requires two dominant C-terminal anchor residues and is capable of associating with a substantially more diverse array of peptide sequences than other nonclassical MHC.


    Organizational Affiliation

    Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
QA-2 antigenA274Mus musculusMutation(s): 0 
Gene Names: Q9H2-Q7
Find proteins for P14429 (Mus musculus)
Explore P14429 
Go to UniProtKB:  P14429
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-2-MICROGLOBULINB99Mus musculusMutation(s): 0 
Gene Names: B2m
Find proteins for P01887 (Mus musculus)
Explore P01887 
Go to UniProtKB:  P01887
NIH Common Fund Data Resources
IMPC  MGI:88127
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
60S RIBOSOMAL PROTEINP9N/AMutation(s): 0 
Find proteins for P84099 (Mus musculus)
Explore P84099 
Go to UniProtKB:  P84099
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.223 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.92α = 90
b = 56.18β = 90
c = 119.92γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
CNSrefinement
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-12-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance