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). Homooligomer. Interaction with RNA results in multimerization due to structural alteration in the NOD domain. Contains a N-terminal ordered domain (NOD) (1-117), central internal disordered domain (IDD) (118-349) and a C-terminal domain (CTD) (350-608) with an atypical Tudor domain containing probably two large unstructured loops. No visible phenotype, but loss of Cajal bodies. Belongs to the coilin family.