Referenced in: none

Automatically associated channels: TRP , TRPV , TRPV5 , TRPV6

Title: The TRPV5/6 calcium channels contain multiple calmodulin binding sites with differential binding properties.

Authors: Nadezda V Kovalevskaya, Fedir M Bokhovchuk, Geerten W Vuister

Journal, date & volume: J. Struct. Funct. Genomics, 2012 Jun , 13, 91-100

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/22354706

Abstract
The epithelial Ca(2+) channels TRPV5/6 (transient receptor potential vanilloid 5/6) are thoroughly regulated in order to fine-tune the amount of Ca(2+) reabsorption. Calmodulin has been shown to be involved into calcium-dependent inactivation of TRPV5/6 channels by binding directly to the distal C-terminal fragment of the channels (de Groot et al. in Mol Cell Biol 31:2845-2853, 12). Here, we investigate this binding in detail and find significant differences between TRPV5 and TRPV6. We also identify and characterize in vitro four other CaM binding fragments of TRPV5/6, which likely are also involved in TRPV5/6 channel regulation. The five CaM binding sites display diversity in binding modes, binding stoichiometries and binding affinities, which may fine-tune the response of the channels to varying Ca(2+)-concentrations.