Alpha-lactalbumin possesses a distinct zinc binding site.Ren, J., Stuart, D.I., Acharya, K.R.
(1993) J.Biol.Chem. 268: 19292-19298
- PubMed: 8366079
- PubMed Abstract:
- 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
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.
Oxford Centre for Molecular Sciences, New Chemistry Laboratory, United Kingdom.