UPF3B

Regulator of nonsense transcripts 3B is a protein that in humans is encoded by the UPF3B gene.[5][6][7]

UPF3B
Available structures
PDBHuman UniProt search: PDBe RCSB
Identifiers
AliasesUPF3B, HMRX62, MRXS14, RENT3B, UPF3X, Upf3p-X, UPF3BP1, UPF3BP2, UPF3BP3, UPF3 regulator of nonsense transcripts homolog B (yeast), UPF3 regulator of nonsense transcripts homolog B, regulator of nonsense mediated mRNA decay, UPF3B regulator of nonsense mediated mRNA decay, MRX82
External IDsOMIM: 300298 MGI: 1915384 HomoloGene: 11307 GeneCards: UPF3B
Gene location (Human)
Chr.X chromosome (human)[1]
BandXq24Start119,805,311 bp[1]
End119,852,998 bp[1]
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

65109

68134

Ensembl

ENSG00000125351

ENSMUSG00000036572

UniProt

Q9BZI7

n/a

RefSeq (mRNA)

NM_023010
NM_080632

NM_026573

RefSeq (protein)

NP_075386
NP_542199

n/a

Location (UCSC)Chr X: 119.81 – 119.85 MbChr X: 37.09 – 37.11 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

This gene encodes a protein that is part of a post-splicing multiprotein complex involved in both mRNA nuclear export and mRNA surveillance. The encoded protein is one of two functional homologs to yeast Upf3p. mRNA surveillance detects exported mRNAs with truncated open reading frames and initiates nonsense-mediated mRNA decay (NMD). When translation ends upstream from the last exon-exon junction, this triggers NMD to degrade mRNAs containing premature stop codons. This protein binds to the mRNA and remains bound after nuclear export, acting as a nucleocytoplasmic shuttling protein. It forms with Y14 a complex that binds specifically 20 nt upstream of exon-exon junctions. This gene is located on the long arm of chromosome X. Two splice variants encoding different isoforms have been found for this gene.[7]

Interactions

UPF3B has been shown to interact with UPF2[6][8][9][10] and UPF1.[6][9][11]

References

  1. GRCh38: Ensembl release 89: ENSG00000125351 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000036572 - 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. Serin G, Gersappe A, Black JD, Aronoff R, Maquat LE (Jan 2001). "Identification and characterization of human orthologues to Saccharomyces cerevisiae Upf2 protein and Upf3 protein (Caenorhabditis elegans SMG-4)". Mol Cell Biol. 21 (1): 209–23. doi:10.1128/MCB.21.1.209-223.2001. PMC 88795. PMID 11113196.
  6. Lykke-Andersen J, Shu MD, Steitz JA (Feb 2001). "Human Upf proteins target an mRNA for nonsense-mediated decay when bound downstream of a termination codon". Cell. 103 (7): 1121–31. doi:10.1016/S0092-8674(00)00214-2. PMID 11163187.
  7. "Entrez Gene: UPF3B UPF3 regulator of nonsense transcripts homolog B (yeast)".
  8. Lehner, Ben; Sanderson Christopher M (Jul 2004). "A protein interaction framework for human mRNA degradation". Genome Res. 14 (7): 1315–23. doi:10.1101/gr.2122004. ISSN 1088-9051. PMC 442147. PMID 15231747.
  9. Lejeune, Fabrice; Li Xiaojie; Maquat Lynne E (Sep 2003). "Nonsense-mediated mRNA decay in mammalian cells involves decapping, deadenylating, and exonucleolytic activities". Mol. Cell. 12 (3): 675–87. doi:10.1016/S1097-2765(03)00349-6. ISSN 1097-2765. PMID 14527413.
  10. Lykke-Andersen, Jens (Dec 2002). "Identification of a human decapping complex associated with hUpf proteins in nonsense-mediated decay". Mol. Cell. Biol. 22 (23): 8114–21. doi:10.1128/MCB.22.23.8114-8121.2002. ISSN 0270-7306. PMC 134073. PMID 12417715.
  11. Schell, Thomas; Köcher Thomas; Wilm Matthias; Seraphin Bertrand; Kulozik Andreas E; Hentze Matthias W (Aug 2003). "Complexes between the nonsense-mediated mRNA decay pathway factor human upf1 (up-frameshift protein 1) and essential nonsense-mediated mRNA decay factors in HeLa cells". Biochem. J. 373 (Pt 3): 775–83. doi:10.1042/BJ20021920. ISSN 0264-6021. PMC 1223536. PMID 12723973.

Further reading

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