The PINIT domain is a protein domain that is found in PIAS proteins [2]. The PINIT domain is about 180 amino acids in length.

1: Structure of the Siz/PIAS SUMO E3 ligase Siz1 and determinants required for SUMO modification of PCNA. Yunus AA, Lima CD; Mol Cell. 2009;35:669-682. PMID:19748360

2: The 'PINIT' motif, of a newly identified conserved domain of the PIAS protein family, is essential for nuclear retention of PIAS3L. Duval D, Duval G, Kedinger C, Poch O, Boeuf H; FEBS Lett. 2003;554:111-118. PMID:14596924