The sequences featured in this family are found repeated in a number of plant calmodulin-binding proteins (such as Swiss:Q8W235, Swiss:Q84ZT8 and Swiss:Q8H6X1), and are thought to constitute the calmodulin-binding domains [1,2]. Binding of the proteins to calmodulin depends on the presence of calcium ions [1,2]. These proteins are thought to be involved in various processes, such as plant defence responses [1] and stolonisation or tuberization [2].

1: Characterization of a pathogen-induced calmodulin-binding protein: mapping of four Ca2+-dependent calmodulin-binding domains. Reddy VS, Ali GS, Reddy AS; Plant Mol Biol 2003;52:143-159. PMID:12825696

2: Isolation and characterization of a novel calmodulin-binding protein from potato. Reddy AS, Day IS, Narasimhulu SB, Safadi F, Reddy VS, Golovkin M, Harnly MJ; J Biol Chem 2002;277:4206-4214. PMID:11684678