Download MendeleyStructural characterization of calcineurin B homologous protein 1
Naoe, Y., Arita, K., Hashimoto, H., Kanazawa, H., Sato, M., Shimizu, T.(2005) J Biol Chem 280: 32372-32378
- PubMed: 15987692
- DOI: https://doi.org/10.1074/jbc.M503390200
- Primary Citation of Related Structures:
2CT9 - PubMed Abstract:
Calcineurin B homologous protein 1 (CHP1), also known as p22, is a calcium-binding EF-hand protein that plays a role in membrane trafficking. It binds to multiple effector proteins, including Na(+)/H(+) exchangers, a serine/threonine kinase, and calcineurin, potentially modulating their function. The crystal structure of calcium-bound CHP1 from rat has been determined at 2.2 Angstroms of resolution. The molecule has a compact alpha-helical structure containing four EF-hands. The overall folding topology of the protein is similar to that of the regulatory B subunit of calcineurin and to that of calcium- and integrin-binding protein. The calcium ion is coordinated in typical fashion in the third and fourth EF-hands, but the first and second EF-hands contain no calcium ion. The first EF-hand is maintained by internal interactions, and the second EF-hand is stabilized by hydrophobic interactions. CHP1 contains a hydrophobic pocket on the opposite side of the protein to the EF-hands that has been implicated in ligand binding.
Organizational Affiliation:
International Graduate School of Arts and Sciences, Yokohama City University, Tsurumi-ku, Japan.
