Encodes a plant coilin, a protein that in other organisms is a major structural scaffolding protein necessary for Cajal body formation, composition and activity. It has been shown to bind both U1 and U1 snRNAs in vitro.
Probable component of nuclear coiled bodies, also known as Cajal bodies or CBs, which are involved in the modification and assembly of nucleoplasmic snRNPs (Probable). Required for CBs formation (PubMed:16624863). Binds snRNAs and non-specific artificial RNA via the N-terminal part of the NOD domain and via the NLS2 region (212-282) of the IDD domain (PubMed:23320094). The two sites are able to function independently and provide effective RNA-binding in a non-cooperative manner (PubMed:23320094).