FEATURES

FAMILY

DESCRIPTION

Also known as SMN_HUMAN, SMN1, SMN2, SMN, SMNT, SMNC. The SMN complex catalyzes the assembly of small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome, and thereby plays an important role in the splicing of cellular pre-mRNAs (PubMed:9845364, PubMed:18984161). Most spliceosomal snRNPs contain a common set of Sm proteins SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF and SNRPG that assemble in a heptameric protein ring on the Sm site of the small nuclear RNA to form the core snRNP (Sm core) (PubMed:18984161). In the cytosol, the Sm proteins SNRPD1, SNRPD2, SNRPE, SNRPF and SNRPG are trapped in an inactive 6S pICln-Sm complex by the chaperone CLNS1A that controls the assembly of the core snRNP (PubMed:18984161). To assemble core snRNPs, the SMN complex accepts the trapped 5Sm proteins from CLNS1A forming an intermediate (PubMed:18984161). Within the SMN complex, SMN1 acts as a structural backbone and together with GEMIN2 it gathers the Sm complex subunits (PubMed:21816274, PubMed:22101937, PubMed:17178713). Binding of snRNA inside 5Sm ultimately triggers eviction of the SMN complex, thereby allowing binding of SNRPD3 and SNRPB to complete assembly of the core snRNP (PubMed:31799625). Ensures the correct splicing of U12 intron-containing genes that may be important for normal motor and proprioceptive neurons development (PubMed:23063131). Also required for resolving RNA-DNA hybrids created by RNA polymerase II, that form R-loop in transcription terminal regions, an important step in proper transcription termination (PubMed:26700805). May also play a role in the metabolism of small nucleolar ribonucleoprotein (snoRNPs). Homooligomer; may form higher order homooligomers in the dimer to octamer range (PubMed:26092730, PubMed:10500148, PubMed:14715275, PubMed:21816274, PubMed:17178713, PubMed:23022347). Part of the core SMN complex that contains SMN1, GEMIN2/SIP1, DDX20/GEMIN3, GEMIN4, GEMIN5, GEMIN6, GEMIN7, GEMIN8 and STRAP/UNRIP (PubMed:9323129, PubMed:17178713). Part of the SMN-Sm complex that contains SMN1, GEMIN2/SIP1, DDX20/GEMIN3, GEMIN4, GEMIN5, GEMIN6, GEMIN7, GEMIN8, STRAP/UNRIP and the Sm proteins SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF and SNRPG (PubMed:12065586, PubMed:18984161). Component of an import snRNP complex composed of KPNB1, RNUT1, SMN1 and ZNF259 (PubMed:12095920). Interacts with DDX20, FBL, NOLA1, RNUT1, SYNCRIP and with several spliceosomal snRNP core Sm proteins, including SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE and ILF3 (PubMed:11574476, PubMed:12095920, PubMed:10500148). Interacts with GEMIN2; the interaction is direct (PubMed:26092730, PubMed:10500148, PubMed:21816274, PubMed:31799625, PubMed:17178713, PubMed:22607171, PubMed:23022347). Interacts with GEMIN3; the interaction is direct (PubMed:17178713). Interacts with GEMIN8; the interaction is direct (PubMed:33754639, PubMed:17178713). Interacts with SNRPB; the interaction is direct (PubMed:10500148). Interacts (via Tudor domain) with SNRPD1 (via C-terminus); the interaction is direct (PubMed:10500148, PubMed:11135666). Interacts with SNRPD2; the interaction is direct (PubMed:10500148). Interacts (via Tudor domain) with SNRPD3 (via C-terminus); the interaction is direct (PubMed:10500148, PubMed:11135666, PubMed:22101937, PubMed:12628254). Interacts with SNRPE; the interaction is direct (PubMed:10500148). Interacts with OSTF1, LSM10, LSM11 and RPP20/POP7 (PubMed:11551898, PubMed:12975319, PubMed:16087681, PubMed:14715275). Interacts (via C-terminal region) with ZPR1 (via C-terminal region) (PubMed:11283611). Interacts (via Tudor domain) with COIL (PubMed:11641277). Interacts with SETX; recruits SETX to POLR2A (PubMed:21700224, PubMed:26700805). Interacts with POLR2A (via the C-terminal domain (CTD)) (PubMed:26700805). Interacts with PRMT5 (PubMed:26700805). Interacts with XRN2 (PubMed:26700805). Interacts (via C-terminus) with FMR1 (via C-terminus); the interaction is direct and occurs in a RNA-independent manner (PubMed:18093976). Interacts (via Tudor domain) with SF3B2 ('Arg-508'-methylated form) (PubMed:25737013). Interacts with WRAP53/TCAB1 (PubMed:21072240). Interacts (via Tudor domain) with ELAVL4 in an RNA-independent manner; the interaction is required for localization of ELAVL4 to RNA granules (PubMed:21088113, PubMed:21389246, PubMed:29061699).

Also known as SMN_HUMAN, SMN1, SMN2, SMN, SMNT, SMNC. The SMN complex catalyzes the assembly of small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome, and thereby pla ...

EXTERNAL LINKS

SMN1, SMN2

Mutations

Mutation(s) distribution

Mutations table