SF3B2

Last updated
SF3B2
Protein SF3B2 PDB 2do5.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases SF3B2 , Cus1, SAP145, SF3B145, SF3b1, SF3b150, splicing factor 3b subunit 2, CFM
External IDs OMIM: 605591; MGI: 2441856; HomoloGene: 6678; GeneCards: SF3B2; OMA:SF3B2 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

10992

319322

Ensembl

ENSG00000087365

ENSMUSG00000024853

UniProt

Q13435

Q3UJB0

RefSeq (mRNA)

NM_006842

NM_030109
NM_001362454

RefSeq (protein)

NP_006833

NP_084385
NP_001349383

Location (UCSC) Chr 11: 66.05 – 66.07 Mb Chr 19: 5.32 – 5.35 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Splicing factor 3B subunit 2 is a protein that in humans is encoded by the SF3B2 gene. [5] [6]

Contents

Function

This gene encodes subunit 2 of the splicing factor 3b protein complex. Splicing factor 3b, together with splicing factor 3a and a 12S RNA unit, forms the U2 small nuclear ribonucleoproteins complex (U2 snRNP). The splicing factor 3b/3a complex binds pre-mRNA upstream of the intron's branch site in a sequence-independent manner and may anchor the U2 snRNP to the pre-mRNA. Splicing factor 3b is also a component of the minor U12-type spliceosome. Subunit 2 associates with pre-mRNA upstream of the branch site at the anchoring site. Subunit 2 also interacts directly with subunit 4 of the splicing factor 3b complex. Subunit 2 is a highly hydrophilic protein with a proline-rich N-terminus and a glutamate-rich stretch in the C-terminus. [6]

Interactions

SF3B2 has been shown to interact with SF3B4, [7] [8] RBM7, [9] SF3B1 [10] [11] and CDC5L. [12]

Related Research Articles

<span class="mw-page-title-main">Spliceosome</span> Molecular machine that removes intron RNA from the primary transcript

A spliceosome is a large ribonucleoprotein (RNP) complex found primarily within the nucleus of eukaryotic cells. The spliceosome is assembled from small nuclear RNAs (snRNA) and numerous proteins. Small nuclear RNA (snRNA) molecules bind to specific proteins to form a small nuclear ribonucleoprotein complex, which in turn combines with other snRNPs to form a large ribonucleoprotein complex called a spliceosome. The spliceosome removes introns from a transcribed pre-mRNA, a type of primary transcript. This process is generally referred to as splicing. An analogy is a film editor, who selectively cuts out irrelevant or incorrect material from the initial film and sends the cleaned-up version to the director for the final cut.

snRNPs, or small nuclear ribonucleoproteins, are RNA-protein complexes that combine with unmodified pre-mRNA and various other proteins to form a spliceosome, a large RNA-protein molecular complex upon which splicing of pre-mRNA occurs. The action of snRNPs is essential to the removal of introns from pre-mRNA, a critical aspect of post-transcriptional modification of RNA, occurring only in the nucleus of eukaryotic cells. Additionally, U7 snRNP is not involved in splicing at all, as U7 snRNP is responsible for processing the 3′ stem-loop of histone pre-mRNA.

<span class="mw-page-title-main">U11 spliceosomal RNA</span> Non-coding RNA involved in alternative splicing

The U11 snRNA is an important non-coding RNA in the minor spliceosome protein complex, which activates the alternative splicing mechanism. The minor spliceosome is associated with similar protein components as the major spliceosome. It uses U11 snRNA to recognize the 5' splice site while U12 snRNA binds to the branchpoint to recognize the 3' splice site.

<span class="mw-page-title-main">U2 spliceosomal RNA</span>

U2 spliceosomal snRNAs are a species of small nuclear RNA (snRNA) molecules found in the major spliceosomal (Sm) machinery of virtually all eukaryotic organisms. In vivo, U2 snRNA along with its associated polypeptides assemble to produce the U2 small nuclear ribonucleoprotein (snRNP), an essential component of the major spliceosomal complex. The major spliceosomal-splicing pathway is occasionally referred to as U2 dependent, based on a class of Sm intron—found in mRNA primary transcripts—that are recognized exclusively by the U2 snRNP during early stages of spliceosomal assembly. In addition to U2 dependent intron recognition, U2 snRNA has been theorized to serve a catalytic role in the chemistry of pre-RNA splicing as well. Similar to ribosomal RNAs (rRNAs), Sm snRNAs must mediate both RNA:RNA and RNA:protein contacts and hence have evolved specialized, highly conserved, primary and secondary structural elements to facilitate these types of interactions.

<span class="mw-page-title-main">U4 spliceosomal RNA</span> Non-coding RNA component of the spliceosome

The U4 small nuclear Ribo-Nucleic Acid is a non-coding RNA component of the major or U2-dependent spliceosome – a eukaryotic molecular machine involved in the splicing of pre-messenger RNA (pre-mRNA). It forms a duplex with U6, and with each splicing round, it is displaced from the U6 snRNA in an ATP-dependent manner, allowing U6 to re-fold and create the active site for splicing catalysis. A recycling process involving protein Brr2 releases U4 from U6, while protein Prp24 re-anneals U4 and U6. The crystal structure of a 5′ stem-loop of U4 in complex with a binding protein has been solved.

<span class="mw-page-title-main">U6 spliceosomal RNA</span> Small nuclear RNA component of the spliceosome

U6 snRNA is the non-coding small nuclear RNA (snRNA) component of U6 snRNP, an RNA-protein complex that combines with other snRNPs, unmodified pre-mRNA, and various other proteins to assemble a spliceosome, a large RNA-protein molecular complex that catalyzes the excision of introns from pre-mRNA. Splicing, or the removal of introns, is a major aspect of post-transcriptional modification and takes place only in the nucleus of eukaryotes.

<span class="mw-page-title-main">U2AF2</span> Protein-coding gene in the species Homo sapiens

Splicing factor U2AF 65 kDa subunit is a protein that in humans is encoded by the U2AF2 gene.

snRNP70 Protein-coding gene in the species Homo sapiens

snRNP70 also known as U1 small nuclear ribonucleoprotein 70 kDa is a protein that in humans is encoded by the SNRNP70 gene. snRNP70 is a small nuclear ribonucleoprotein that associates with U1 spliceosomal RNA, forming the U1snRNP a core component of the spliceosome. The U1-70K protein and other components of the spliceosome complex form detergent-insoluble aggregates in both sporadic and familial human cases of Alzheimer's disease. U1-70K co-localizes with Tau in neurofibrillary tangles in Alzheimer's disease.

<span class="mw-page-title-main">U2 small nuclear RNA auxiliary factor 1</span> Protein-coding gene in the species Homo sapiens

Splicing factor U2AF 35 kDa subunit is a protein that in humans is encoded by the U2AF1 gene.

<span class="mw-page-title-main">Small nuclear ribonucleoprotein D2</span> Protein-coding gene in the species Homo sapiens

Small nuclear ribonucleoprotein Sm D2 is a protein that in humans is encoded by the SNRPD2 gene. It belongs to the small nuclear ribonucleoprotein core protein family, and is required for pre-mRNA splicing and small nuclear ribonucleoprotein biogenesis. Alternative splicing occurs at this locus and two transcript variants encoding the same protein have been identified.

<span class="mw-page-title-main">SNRPD3</span> Protein-coding gene in the species Homo sapiens

Small nuclear ribonucleoprotein Sm D3 is a protein that in humans is encoded by the SNRPD3 gene.

<span class="mw-page-title-main">SF3A1</span> Protein-coding gene in the species Homo sapiens

Splicing factor 3 subunit 1 is a protein that in humans is encoded by the SF3A1 gene.

<span class="mw-page-title-main">SF3B1</span> Protein-coding gene in humans

Splicing factor 3B subunit 1 is a protein that in humans is encoded by the SF3B1 gene.

<span class="mw-page-title-main">SF3A3</span> Protein-coding gene in the species Homo sapiens

Splicing factor 3A subunit 3 is a protein that in humans is encoded by the SF3A3 gene.

<span class="mw-page-title-main">SF3A2</span> Protein-coding gene in the species Homo sapiens

Splicing factor 3A subunit 2 is a protein that in humans is encoded by the SF3A2 gene.

<span class="mw-page-title-main">SF3B4</span> Protein-coding gene in the species Homo sapiens

Splicing factor 3B subunit 4 is a protein that in humans is encoded by the SF3B4 gene.

<span class="mw-page-title-main">SF3B3</span> Protein-coding gene in the species Homo sapiens

Splicing factor 3B subunit 3 is a protein that in humans is encoded by the SF3B3 gene.

<span class="mw-page-title-main">SF3B6</span> Protein-coding gene in the species Homo sapiens

Splicing factor 3B subunit 6, is a protein encoded by SF3B6 gene in vertebrates.

<span class="mw-page-title-main">DDX46</span> Protein-coding gene in the species Homo sapiens

Probable ATP-dependent RNA helicase DDX46 is an enzyme that in humans is encoded by the DDX46 gene.

<span class="mw-page-title-main">DDX42</span> Protein-coding gene in the species Homo sapiens

ATP-dependent RNA helicase DDX42 is an enzyme that in humans is encoded by the DDX42 gene.

References

  1. 1 2 3 GRCh38: Ensembl release 89: ENSG00000087365 – Ensembl, May 2017
  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000024853 – Ensembl, May 2017
  3. ↑ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ↑ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ↑ Gozani O, Feld R, Reed R (Jan 1996). "Evidence that sequence-independent binding of highly conserved U2 snRNP proteins upstream of the branch site is required for assembly of spliceosomal complex A". Genes & Development. 10 (2): 233–43. doi: 10.1101/gad.10.2.233 . PMID   8566756.
  6. 1 2 "Entrez Gene: SF3B2 splicing factor 3b, subunit 2, 145kDa".
  7. ↑ Rual JF, Venkatesan K, Hao T, Hirozane-Kishikawa T, Dricot A, Li N, Berriz GF, Gibbons FD, Dreze M, Ayivi-Guedehoussou N, Klitgord N, Simon C, Boxem M, Milstein S, Rosenberg J, Goldberg DS, Zhang LV, Wong SL, Franklin G, Li S, Albala JS, Lim J, Fraughton C, Llamosas E, Cevik S, Bex C, Lamesch P, Sikorski RS, Vandenhaute J, Zoghbi HY, Smolyar A, Bosak S, Sequerra R, Doucette-Stamm L, Cusick ME, Hill DE, Roth FP, Vidal M (Oct 2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–8. Bibcode:2005Natur.437.1173R. doi:10.1038/nature04209. PMID   16189514. S2CID   4427026.
  8. ↑ Champion-Arnaud P, Reed R (Aug 1994). "The prespliceosome components SAP 49 and SAP 145 interact in a complex implicated in tethering U2 snRNP to the branch site". Genes & Development. 8 (16): 1974–83. doi: 10.1101/gad.8.16.1974 . PMID   7958871.
  9. ↑ Guo TB, Boros LG, Chan KC, Hikim AP, Hudson AP, Swerdloff RS, Mitchell AP, Salameh WA (2003). "Spermatogenetic expression of RNA-binding motif protein 7, a protein that interacts with splicing factors". Journal of Andrology. 24 (2): 204–14. doi:10.1002/j.1939-4640.2003.tb02664.x. PMID   12634307.
  10. ↑ Das BK, Xia L, Palandjian L, Gozani O, Chyung Y, Reed R (Oct 1999). "Characterization of a protein complex containing spliceosomal proteins SAPs 49, 130, 145, and 155". Molecular and Cellular Biology. 19 (10): 6796–802. doi:10.1128/mcb.19.10.6796. PMC   84676 . PMID   10490618.
  11. ↑ Will CL, Urlaub H, Achsel T, Gentzel M, Wilm M, Lührmann R (Sep 2002). "Characterization of novel SF3b and 17S U2 snRNP proteins, including a human Prp5p homologue and an SF3b DEAD-box protein". The EMBO Journal. 21 (18): 4978–88. doi:10.1093/emboj/cdf480. PMC   126279 . PMID   12234937.
  12. ↑ Ajuh P, Kuster B, Panov K, Zomerdijk JC, Mann M, Lamond AI (Dec 2000). "Functional analysis of the human CDC5L complex and identification of its components by mass spectrometry". The EMBO Journal. 19 (23): 6569–81. doi:10.1093/emboj/19.23.6569. PMC   305846 . PMID   11101529.

Further reading

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