TAF1B

TATA box binding protein (TBP)-associated factor, RNA polymerase I, B, 63kDa
Identifiers
Symbols	TAF1B ; MGC:9349; RAF1B; RAFI63; SL1; TAFI63
External IDs	OMIM: 604904 MGI: 109577 HomoloGene: 31331 GeneCards: TAF1B Gene
Gene ontology Molecular function • RNA polymerase I CORE element sequence-specific DNA binding • transcription factor activity, RNA polymerase I CORE element binding transcription factor recruiting • transcription factor activity, sequence-specific DNA binding • protein binding • TBP-class protein binding • metal ion binding Cellular component • nucleus • nucleoplasm • extracellular exosome • RNA polymerase I core factor complex Biological process • chromatin silencing at rDNA • RNA polymerase I transcriptional preinitiation complex assembly at the promoter for the nuclear large rRNA transcript • transcription, DNA-templated • transcription from RNA polymerase I promoter • transcription initiation from RNA polymerase I promoter • transcription elongation from RNA polymerase I promoter • termination of RNA polymerase I transcription • gene expression • regulation of gene expression, epigenetic • negative regulation of gene expression, epigenetic Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	9014	21340
Ensembl	ENSG00000115750	ENSMUSG00000059669
UniProt	Q53T94	P97358
RefSeq (mRNA)	NM_005680	NM_020614
RefSeq (protein)	NP_005671	NP_065639
Location (UCSC)	Chr 2: 9.84 – 9.93 Mb	Chr 12: 24.5 – 24.56 Mb
PubMed search

TATA box-binding protein-associated factor RNA polymerase I subunit B is an enzyme that in humans is encoded by the TAF1B gene.^[1][2]

Function

Initiation of transcription by RNA polymerase I requires the formation of a complex composed of the TATA-binding protein (TBP) and three TBP-associated factors (TAFs) specific for RNA polymerase I. This complex, known as SL1, binds to the core promoter of ribosomal RNA genes to position the polymerase properly and acts as a channel for regulatory signals. This gene encodes one of the SL1-specific TAFs.^[2]

Interactions

TAF1B has been shown to interact with RRN3.^[3]

References

1. Comai L, Zomerdijk JC, Beckmann H, Zhou S, Admon A, Tjian R (January 1995). "Reconstitution of transcription factor SL1: exclusive binding of TBP by SL1 or TFIID subunits". Science 266 (5193): 1966–72. doi:10.1126/science.7801123. PMID 7801123. Check date values in: |year= / |date= mismatch (help)
2. "Entrez Gene: TAF1B TATA box binding protein (TBP)-associated factor, RNA polymerase I, B, 63kDa".
3. Miller G, Panov KI, Friedrich JK, Trinkle-Mulcahy L, Lamond AI, Zomerdijk JC (March 2001). "hRRN3 is essential in the SL1-mediated recruitment of RNA Polymerase I to rRNA gene promoters". EMBO J. 20 (6): 1373–82. doi:10.1093/emboj/20.6.1373. PMC 145519. PMID 11250903.

Further reading

• Di Pietro C, Rapisarda A, Amico V, Bonaiuto C, Viola A, Scalia M, Motta S, Amato A, Engel H, Messina A, Sichel G, Grzeschik K, Purrello M (2000). "Genomic localization of the human genes TAF1A, TAF1B and TAF1C, encoding TAF(I)48, TAF(I)63 and TAF(I)110 subunits of class I general transcription initiation factor SL1". Cytogenet. Cell Genet. 89 (1-2): 133–6. doi:10.1159/000015592. PMID 10894955.
• Zhai W, Comai L (2000). "Repression of RNA polymerase I transcription by the tumor suppressor p53". Mol. Cell. Biol. 20 (16): 5930–8. doi:10.1128/MCB.20.16.5930-5938.2000. PMC 86070. PMID 10913176.
• Miller G, Panov KI, Friedrich JK, Trinkle-Mulcahy L, Lamond AI, Zomerdijk JC (2001). "hRRN3 is essential in the SL1-mediated recruitment of RNA Polymerase I to rRNA gene promoters". EMBO J. 20 (6): 1373–82. doi:10.1093/emboj/20.6.1373. PMC 145519. PMID 11250903.
• Kim NG, Rhee H, Li LS, Kim H, Lee JS, Kim JH, Kim NK, Kim H (2002). "Identification of MARCKS, FLJ11383 and TAF1B as putative novel target genes in colorectal carcinomas with microsatellite instability". Oncogene 21 (33): 5081–7. doi:10.1038/sj.onc.1205703. PMID 12140758.
• Yuan X, Zhao J, Zentgraf H, Hoffmann-Rohrer U, Grummt I (2002). "Multiple interactions between RNA polymerase I, TIF-IA and TAF(I) subunits regulate preinitiation complex assembly at the ribosomal gene promoter". EMBO Rep. 3 (11): 1082–7. doi:10.1093/embo-reports/kvf212. PMC 1307603. PMID 12393749.
• Grandori C, Gomez-Roman N, Felton-Edkins ZA, Ngouenet C, Galloway DA, Eisenman RN, White RJ (2005). "c-Myc binds to human ribosomal DNA and stimulates transcription of rRNA genes by RNA polymerase I". Nat. Cell Biol. 7 (3): 311–8. doi:10.1038/ncb1224. PMID 15723054.
• You KT, Li LS, Kim NG, Kang HJ, Koh KH, Chwae YJ, Kim KM, Kim YK, Park SM, Jang SK, Kim H (2007). "Selective translational repression of truncated proteins from frameshift mutation-derived mRNAs in tumors". PLoS Biol. 5 (5): e109. doi:10.1371/journal.pbio.0050109. PMC 1854916. PMID 17456004.