The Integrator complex is involved in small nuclear RNA (snRNA) U1 and U2 transcription, and in their 3'-box-dependent processing. This complex associates with the C-terminal domain of RNA polymerase II largest subunit and is recruited to the U1 and U2 snRNAs genes [1]. This entry represents the N-terminal domain of the Integrator complex subunit 3 (Ints3), also known as SOSS complex subunit A (SOSSA). It is a component of the sensor of single-stranded DNA complex (SOSS), which associates with single-stranded DNA, important for DNA repair and efficient homologous recombination [2]. This subunit serves as a central adaptor for SOSS complex assembly and stability, and facilitates the accumulation of the complex to the sites of DNA damage. This region acts as a scaffold for SOSSB1 and SOSSC interaction and it is not essential for ssDNA binding [2].

1: Integrator, a multiprotein mediator of small nuclear RNA processing, associates with the C-terminal repeat of RNA polymerase II. Baillat D, Hakimi MA, Naar AM, Shilatifard A, Cooch N, Shiekhattar R; Cell. 2005;123:265-276. PMID:16239144

2: Structural basis of SOSS1 complex assembly and recognition of ssDNA. Ren W, Chen H, Sun Q, Tang X, Lim SC, Huang J, Song H; Cell Rep. 2014;6:982-991. PMID:24630995