Many ciliary proteins are involved in ciliogenesis and implicated for ciliophathies. A recent study has shown that many of them contain various new versions of C2 domains which are predicted to mediate membrane localisations for Y-shaped linkers of transition zone of cilia [1]. This is the first C2 domain of ciliary CC2D2A proteins which also have another C2 domain (CC2D2AC-C2) and a new inactive transglutaminase-like peptidase domain (CC2D2A-TGL).

1: Novel transglutaminase-like peptidase and C2 domains elucidate the structure, biogenesis and evolution of the ciliary compartment. Zhang D, Aravind L; Cell Cycle. 2012; [Epub ahead of print] PMID:22983010