The product of this gene is part of the SMN protein complex localized to the cytoplasm, nucleoli, and to discrete nuclear bodies called Gemini bodies (gems). The complex functions in spliceosomalsnRNP assembly in the cytoplasm, and regenerates spliceosomes required for pre-mRNA splicing in the nucleus. The encoded protein directly interacts with a DEAD box protein and several spliceosome core proteins. Alternatively spliced transcript variants have been described, but their biological validity has not been determined.[6]
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Carnegie GK, Sleeman JE, Morrice N, Hastie CJ, Peggie MW, Philp A, Lamond AI, Cohen PT (2004). "Protein phosphatase 4 interacts with the Survival of Motor Neurons complex and enhances the temporal localisation of snRNPs". J. Cell Sci. 116 (Pt 10): 1905–13. doi:10.1242/jcs.00409. PMID12668731. S2CID1152816.
Di Y, Li J, Zhang Y, He X, Lu H, Xu D, Ling J, Huo K, Wan D, Li YY, Gu J (2004). "HCC-associated protein HCAP1, a variant of GEMIN4, interacts with zinc-finger proteins". J. Biochem. 133 (6): 713–8. doi:10.1093/jb/mvg091. PMID12869526.
Wan D, He M, Wang J, Qiu X, Zhou W, Luo Z, Chen J, Gu J (2004). "Two variants of the human hepatocellular carcinoma-associated HCAP1 gene and their effect on the growth of the human liver cancer cell line Hep3B". Genes Chromosomes Cancer. 39 (1): 48–58. doi:10.1002/gcc.10293. PMID14603441. S2CID20451424.
Ewing RM, Chu P, Elisma F, Li H, Taylor P, Climie S, McBroom-Cerajewski L, Robinson MD, O'Connor L, Li M, Taylor R, Dharsee M, Ho Y, Heilbut A, Moore L, Zhang S, Ornatsky O, Bukhman YV, Ethier M, Sheng Y, Vasilescu J, Abu-Farha M, Lambert JP, Duewel HS, Stewart II, Kuehl B, Hogue K, Colwill K, Gladwish K, Muskat B, Kinach R, Adams SL, Moran MF, Morin GB, Topaloglou T, Figeys D (2007). "Large-scale mapping of human protein–protein interactions by mass spectrometry". Mol. Syst. Biol. 3 (1): 89. doi:10.1038/msb4100134. PMC1847948. PMID17353931.