Structural evidence for the presence of a secondary calcium binding site in human alpha-lactalbumin.Chandra, N., Brew, K., Acharya, K.R.
(1998) Biochemistry 37: 4767-4772
- PubMed: 9537992
- DOI: 10.1021/bi973000t
- PubMed Abstract:
- 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
- Study by Mutagenesis of the Roles of Two Aromatic Clusters of Alpha-Lactalbumin in Aspects of its Action in the Lactose Synthase System
Grobler, J.A.,Wang, M.,Pike, A.C.,Brew, K.
(1994) J.Biol.Chem. 269: 5106
- Alpha-Lactalbumin Possesses a Distinct Zinc Binding Site
Ren, J.,Stuart, D.I.,Acharya, K.R.
(1993) J.Biol.Chem. 268: 19292
- 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
The high-resolution X-ray crystal structure of human alpha-lactalbumin (at 1.8 A) in the presence of an elevated level of calcium reveals a new secondary calcium binding site, 7.9 A away from the primary calcium binding site known in all alpha-lactal ...
The high-resolution X-ray crystal structure of human alpha-lactalbumin (at 1.8 A) in the presence of an elevated level of calcium reveals a new secondary calcium binding site, 7.9 A away from the primary calcium binding site known in all alpha-lactalbumin structures so far. The new calcium binding site is different from the zinc and sulfate binding sites [Ren, J., et al. (1993) J. Biol. Chem. 268, 19292-19298] but shares common features with the manganese binding site as described by Gerkin [Gerkin, T. A. (1984) Biochemistry 23, 4688-4697]. The proximity of the manganese and calcium binding region and the location of the functional site on one side of the charged surface of the alpha-lactalbumin molecule suggest that these binding sites might play a role in the formation of the lactose synthase complex.
Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.