1HFY

ALPHA-LACTALBUMIN

• PDB DOI:  https://doi.org/10.2210/pdb1HFY/pdb

• Classification: GLYCOPROTEIN
• Organism(s): Capra hircus
• Mutation(s): No 


• Deposited: 1996-06-13 Released: 1997-07-07 
• Deposition Author(s): Pike, A.C.W., Brew, K., Acharya, K.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.270 
• R-Value Work: 0.195 
• R-Value Observed: 0.195 

Literature

Crystal structures of guinea-pig, goat and bovine alpha-lactalbumin highlight the enhanced conformational flexibility of regions that are significant for its action in lactose synthase.

Pike, A.C., Brew, K., Acharya, K.R.

(1996) Structure 4: 691-703

• PubMed: 8805552 
• DOI: https://doi.org/10.1016/s0969-2126(96)00075-5
• Primary Citation of Related Structures:  
  1HFX, 1HFY, 1HFZ


• PubMed Abstract: 
  

The regulation of milk lactose biosynthesis is highly dependent on the action of a specifier protein, alpha-lactalbumin (LA). Together with a glycosyltransferase, LA forms the enzyme complex lactose synthase. LA promotes the binding of glucose to the complex and facilitates the biosynthesis of lactose. To gain further insight into the molecular basis of LA function in lactose synthase we have determined the structures of three species variants of LA.

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Related Citations: 

• Crystal Structure of Human Alpha-Lactalbumin at 1.7 A Resolution
  Acharya, K.R., Ren, J.S., Stuart, D.I., Phillips, D.C., Fenna, R.E.
  (1991) J Mol Biol 221: 571

• Refined Structure of Baboon Alpha-Lactalbumin at 1.7 A Resolution. Comparison with C-Type Lysozyme
  Acharya, K.R., Stuart, D.I., Walker, N.P., Lewis, M., Phillips, D.C.
  (1989) J Mol Biol 208: 99

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Organizational Affiliation: 

School of Biology and Biochemistry, University of Bath, Claverton Down, UK.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 28.5 kDa 
• Atom Count: 2,006 
• Modelled Residue Count: 240 
• Deposited Residue Count: 246 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-LACTALBUMIN	A, B	123	Capra hircus	Mutation(s): 0  Gene Names: LALBA EC: 2.4.1.22
UniProt
Find proteins for P00712 (Capra hircus) Explore P00712  Go to UniProtKB:  P00712

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	C [auth A], D [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.270 
• R-Value Work: 0.195 
• R-Value Observed: 0.195 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 32.5	α = 90
b = 89.7	β = 94.5
c = 45.2	γ = 90

Software Package:

Software Name	Purpose
XDS	data scaling
XSCALE	data scaling
X-PLOR	model building
X-PLOR	refinement
XDS	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-07-07 
Deposition Author(s): Pike, A.C.W., Brew, K., Acharya, K.R.

Revision History  

• Version 1.0: 1997-07-07
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance