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The SAP (after SAF-A/B, Acinus and PIAS) motif is a putative DNA/RNA binding domain found in diverse nuclear and cytoplasmic proteins.
The SAP motif is a 35-residue motif, which has been named after SAF-A/B, Acinus and PIAS, three proteins known to contain it. The SAP motif is found in a variety of nuclear proteins involved in transcription, DNA repair, RNA processing or apoptotic chromatin degradation. As the sap motif of SAF-A has been shown to be essential for specific DNA binding activity, it has been proposed that it could be a DNA-binding motif [PUBMED:10694879].