1HML

ALPHA_LACTALBUMIN POSSESSES A DISTINCT ZINC BINDING SITE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Work: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Alpha-lactalbumin possesses a distinct zinc binding site.

Ren, J.Stuart, D.I.Acharya, K.R.

(1993) J.Biol.Chem. 268: 19292-19298


  • PubMed Abstract: 
  • It has been proposed that the binding of Zn2+ to alpha-lactalbumin switches the conformation to one akin to a state intermediate in the folding of the protein. However, the high resolution x-ray crystal structure of human alpha-lactalbumin-Zn2+ compl ...

    It has been proposed that the binding of Zn2+ to alpha-lactalbumin switches the conformation to one akin to a state intermediate in the folding of the protein. However, the high resolution x-ray crystal structure of human alpha-lactalbumin-Zn2+ complex at 1.7-A resolution (pH 7.6) does not reveal any significant change in conformation from the native state. The Zn2+ ion binds specifically in the "cleft" of alpha-lactalbumin (the region which forms the active site of the homologous protein lysozyme). This may suggest a possible role for Zn2+ binding in lactose synthase complex. The coordination of the Zn2+ ion involves a symmetry-related molecule in the crystal, the crystal contacts being stabilized by a SO4(2-) ion bound at the interface between three molecules.


    Related Citations: 
    • Crystal Structure of Human Alpha_Lactalbumin at 7 1.7 Angstroms Resolution
      Acharya, K.R.,Ren, J.,Stuart, D.I.,Phillips, D.C.,Fenna, R.F.
      (1991) J.Mol.Biol. 221: 571
    • Alpha_Lactalbumin Possesses a Novel Calcium Binding Loop
      Stuart, D.I.,Acharya, K.R.,Walker, N.P.C.,Smith, S.G.,Lewis, M.,Phillips, D.C.
      (1986) Nature 324: 84


    Organizational Affiliation

    Oxford Centre for Molecular Sciences, New Chemistry Laboratory, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-LACTALBUMIN
A
142Homo sapiensGene Names: LALBA (LYZL7)
Find proteins for P00709 (Homo sapiens)
Go to Gene View: LALBA
Go to UniProtKB:  P00709
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Work: 0.165 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 35.600α = 90.00
b = 69.700β = 90.00
c = 46.200γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-01-26
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance