This gene encodes one of four subunits of the splicing
factor 3B. The protein encoded by this gene cross-links to a region
in the pre-mRNA immediately upstream of the branchpoint sequence in
pre-mRNA in the prespliceosomal complex A. It also may be involved
in the assembly of the B, C and E spliceosomal complexes. In
addition to RNA-binding activity, this protein interacts directly
and highly specifically with subunit 2 of the splicing factor 3B.
This protein contains two N-terminal RNA-recognition motifs (RRMs),
consistent with the observation that it binds directly to pre-mRNA.
