The RSB motif on the Acinus protein is the core around which the ASAP complex is built. The apoptosis and splicing-associated protein complex, ASAP, is made up of three proteins, SAP18 (Sin3-associated protein of 18 kDa), RNA-binding protein S1 (RNPS1) and apoptotic chromatin inducer in the nucleus (Acinus). The ASAP complex appears to be an assembly of proteins at the interface between transcription, splicing and NMD, acting as a hub in the network of protein-interactions that regulate gene-expression.

1: The structure of the ASAP core complex reveals the existence of a Pinin-containing PSAP complex. Murachelli AG, Ebert J, Basquin C, Le Hir H, Conti E; Nat Struct Mol Biol. 2012;19:378-386. PMID:22388736