Human Gene POLR1B (ENST00000263331.10) from GENCODE V44
Description: Homo sapiens RNA polymerase I subunit B (POLR1B), transcript variant 1, mRNA. (from RefSeq NM_019014) RefSeq Summary (NM_019014): Eukaryotic RNA polymerase I (pol I) is responsible for the transcription of ribosomal RNA (rRNA) genes and production of rRNA, the primary component of ribosomes. Pol I is a multisubunit enzyme composed of 6 to 14 polypeptides, depending on the species. Most of the mass of the pol I complex derives from the 2 largest subunits, Rpa1 and Rpa2 in yeast. POLR1B is homologous to Rpa2 (Seither and Grummt, 1996 [PubMed 8921381]).[supplied by OMIM, Mar 2008]. Sequence Note: The RefSeq transcript and protein were derived from genomic sequence to make the sequence consistent with the reference genome assembly. The genomic coordinates used for the transcript record were based on alignments. Gencode Transcript: ENST00000263331.10 Gencode Gene: ENSG00000125630.16 Transcript (Including UTRs) Position: hg38 chr2:112,542,465-112,579,818 Size: 37,354 Total Exon Count: 15 Strand: + Coding Region Position: hg38 chr2:112,542,495-112,575,729 Size: 33,235 Coding Exon Count: 15
ID:RPA2_HUMAN DESCRIPTION: RecName: Full=DNA-directed RNA polymerase I subunit RPA2; Short=RNA polymerase I subunit 2; EC=2.7.7.6; AltName: Full=DNA-directed RNA polymerase I 135 kDa polypeptide; Short=RPA135; FUNCTION: DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Second largest core component of RNA polymerase I which synthesizes ribosomal RNA precursors. Proposed to contribute to the polymerase catalytic activity and forms the polymerase active center together with the largest subunit. Pol I is composed of mobile elements and RPA2 is part of the core element with the central large cleft and probably a clamp element that moves to open and close the cleft (By similarity). CATALYTIC ACTIVITY: Nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1). SUBUNIT: Component of the RNA polymerase I (Pol I) complex consisting of at least 13 subunits (By similarity). SUBCELLULAR LOCATION: Nucleus, nucleolus. SIMILARITY: Belongs to the RNA polymerase beta chain family.
The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.
ModBase Predicted Comparative 3D Structure on Q9H9Y6
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Orthologous Genes in Other Species
Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
BioCarta from NCI Cancer Genome Anatomy Project h_arfPathway - Tumor Suppressor Arf Inhibits Ribosomal Biogenesis
Reactome (by CSHL, EBI, and GO)
Protein Q9H9Y6 (Reactome details) participates in the following event(s):
R-HSA-73865 Assembly of RNA Polymerase I Holoenzyme (human) R-HSA-73757 Binding of RRN3 to RNA Polymerase I R-HSA-5250947 B-WICH complex binds rDNA promoter R-HSA-73758 Recruitment of Active RNA Polymerase I to SL1:phos.UBF-1:rDNA Promoter R-HSA-74994 Polymerase I Transcription Complex/Nascent Pre rRNA Complex pauses at the TTF-I:Sal Box R-HSA-73769 Loss of Rrn3 from RNA Polymerase I promoter escape complex R-HSA-74992 Dissociation of PTRF:Polymerase I/Nascent Pre rRNA Complex:TTF-I:Sal Box R-HSA-5250930 B-WICH recruits histone acetyltransferases R-HSA-74993 PTRF Binds the Polymerase I Transcription Complex/Nascent Pre rRNA Complex paused at the TTF-I:Sal Box R-HSA-74986 Elongation of pre-rRNA transcript R-HSA-427366 Transcription of intergenic spacer of the rRNA gene R-HSA-5250938 B-WICH:histone acetyltransferase acetylates histone H3 at lysine-9 R-HSA-73762 RNA Polymerase I Transcription Initiation R-HSA-5250924 B-WICH complex positively regulates rRNA expression R-HSA-73854 RNA Polymerase I Promoter Clearance R-HSA-73863 RNA Polymerase I Transcription Termination R-HSA-73772 RNA Polymerase I Promoter Escape R-HSA-5250913 Positive epigenetic regulation of rRNA expression R-HSA-73864 RNA Polymerase I Transcription R-HSA-73777 RNA Polymerase I Chain Elongation R-HSA-427413 NoRC negatively regulates rRNA expression R-HSA-212165 Epigenetic regulation of gene expression R-HSA-74160 Gene expression (Transcription) R-HSA-5250941 Negative epigenetic regulation of rRNA expression
US Server
