Squamous cell carcinoma antigen recognized by T-cells 3 (SART3)

U6 snRNP-binding protein that serves as a recycling factor of the splicing machinery. Promotes the initial reassembly of U4 and U6 snRNPs after their ejection from the spliceosome during its maturation (PubMed:12032085).

Also binds U6atac snRNPs and may function as a recycling factor for U4atac/U6atac spliceosomal snRNP, an initial step in the assembly of U12-type spliceosomal complex. The U12-type spliceosomal complex plays a role in the splicing of introns with non-canonical splice sites (PubMed:14749385).