1BMG

CRYSTAL STRUCTURE OF BOVINE BETA2-MICROGLOBULIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Three-dimensional structure of beta 2-microglobulin.

Becker, J.W.Reeke Jr., G.N.

(1985) Proc Natl Acad Sci U S A 82: 4225-4229

  • DOI: 10.1073/pnas.82.12.4225
  • Primary Citation of Related Structures:  
    1BMG

  • PubMed Abstract: 
  • The three-dimensional structure of beta 2-microglobulin, the light chain of the major histocompatibility complex class I antigens, has been determined by x-ray crystallography. An electron density map of the bovine protein was calculated at a nominal resolution of 2 ...

    The three-dimensional structure of beta 2-microglobulin, the light chain of the major histocompatibility complex class I antigens, has been determined by x-ray crystallography. An electron density map of the bovine protein was calculated at a nominal resolution of 2.9 A by using the methods of multiple isomorphous replacement and electron density modification refinement. The molecule is approximately 45 X 25 X 20 A in size. Almost half of the amino acid residues participate in two large beta structures, one of four strands and the other of three, linked by a central disulfide bond. The molecule thus strongly resembles Ig constant domains in polypeptide chain folding and overall tertiary structure. Amino acid residues that are the same in the sequences of beta 2-microglobulin and Ig constant domains are predominantly in the interior of the molecule, whereas residues conserved among beta 2-microglobulins from different species are both in the interior and on the molecular surface. In the crystals studied, the molecule is clearly monomeric, consistent with the observation that beta 2-microglobulin, unlike Ig constant domains, apparently does not form dimers in vivo but associates with the heavy chains of major histocompatibility complex antigens. Our results demonstrate that, at the level of detailed three-dimensional structure, the light chain of the major histocompatibility class I antigens belongs to a superfamily of structures related to the Ig constant domains.


    Related Citations: 
    • Complete Amino Acid Sequence of Bovine Beta2-Microglobulin
      Groves, M.L., Greenberg, R.
      (1982) J Biol Chem 257: 2619
    • Crystallographic Studies of Bovine Beta2-Microglobulin
      Becker, J.W., Ziffer, J.A., Edelman, G.M., Cunningham, B.A.
      (1977) Proc Natl Acad Sci U S A 74: 3345

    Organizational Affiliation

    Department of Life Sciences, Ben-Gurion University of the Negev, 1 Ben-Gurion Avenue, Beer-Sheva 84105, Israel.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA=2=-MICROGLOBULIN A98Bos taurusMutation(s): 0 
Gene Names: B2M
Find proteins for P01888 (Bos taurus)
Explore P01888 
Go to UniProtKB:  P01888
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.27α = 90
b = 47.99β = 90
c = 34.42γ = 90
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORmodel building
PROLSQrefinement
ROCKSdata collection
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-10-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 1.4: 2019-07-17
    Changes: Data collection, Refinement description