1BSQ

STRUCTURAL AND FUNCTIONAL CONSEQUENCES OF POINT MUTATIONS OF VARIANTS A AND B OF BOVINE BETA-LACTOGLOBULIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Functional implications of structural differences between variants A and B of bovine beta-lactoglobulin.

Qin, B.Y.Bewley, M.C.Creamer, L.K.Baker, E.N.Jameson, G.B.

(1999) Protein Sci 8: 75-83

  • DOI: 10.1110/ps.8.1.75
  • Primary Citation of Related Structures:  
    1BSQ

  • PubMed Abstract: 
  • The structure of the trigonal crystal form of bovine beta-lactoglobulin variant B at pH 7.1 has been determined by X-ray diffraction methods at a resolution of 2.22 A and refined to values for R and Rfree of 0.239 and 0.286, respectively. By comparison with the structure of the trigonal crystal form of bovine beta-lactoglobulin variant A at pH 7 ...

    The structure of the trigonal crystal form of bovine beta-lactoglobulin variant B at pH 7.1 has been determined by X-ray diffraction methods at a resolution of 2.22 A and refined to values for R and Rfree of 0.239 and 0.286, respectively. By comparison with the structure of the trigonal crystal form of bovine beta-lactoglobulin variant A at pH 7.1, which was determined previously [Qin BY et al., 1998, Biochemistry 37:14014-14023], the structural consequences of the sequence differences D64G and V118A of variants A and B, respectively, have been investigated. Only minor differences in the core calyx structure occur. In the vicinity of the mutation site D64G on loop CD (residues 61-67), there are small changes in main-chain conformation, whereas the substitution V118A on beta-strand H is unaccompanied by changes in the surrounding structure, thereby creating a void volume and weakened hydrophobic interactions with a consequent loss of thermal stability relative to variant A. A conformational difference is found for the loop EF, implicated in the pH-dependent conformational change known as the Tanford transition, but it is not clear whether this reflects differences intrinsic to the variants in solution or differences in crystallization.


    Organizational Affiliation

    Centre for Structural Biology, Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (BETA-LACTOGLOBULIN)A162Bos taurusMutation(s): 0 
Gene Names: LGB
UniProt
Find proteins for P02754 (Bos taurus)
Explore P02754 
Go to UniProtKB:  P02754
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.231α = 90
b = 54.231β = 90
c = 113.019γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-09-02
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance