May be involved in Ca 2(+)-dependent signaling and membrane trafficking. Plays a role in fruit dehiscence (Probable). Components of the machinery involved in organ development mediated by the receptor-like kinase STRUBBELIG (SUB) (PubMed:19180193, PubMed:20298225). Binds Ca(2+) via the C2 domains in absence of phospholipids. STRUBBELIG-like (sub-like) mutant (SLM) phenotype characterized by defects in outer integument development, floral organ shape, and stem twisting, as well as cellular defects in the floral meristem and in root hair patterning. Belongs to the MCTP family.