Download MendeleyStructural 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: https://doi.org/10.1021/bi973000t
- Primary Citation of Related Structures:
1A4V - PubMed Abstract:
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.
Organizational Affiliation:
Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
