Aliases for POLR3B Gene
External Ids for POLR3B Gene
Previous GeneCards Identifiers for POLR3B Gene
This gene encodes the second largest subunit of RNA polymerase III, the polymerase responsible for synthesizing transfer and small ribosomal RNAs in eukaryotes. The largest subunit and the encoded protein form the catalytic center of RNA polymerase III. Mutations in this gene are a cause of hypomyelinating leukodystrophy. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]
GeneCards Summary for POLR3B Gene
POLR3B (RNA Polymerase III Subunit B) is a Protein Coding gene. Diseases associated with POLR3B include Leukodystrophy, Hypomyelinating, 8, With Or Without Oligodontia And/Or Hypogonadotropic Hypogonadism and Cerebellar Hypoplasia With Endosteal Sclerosis. Among its related pathways are RNA Polymerase II Transcription Initiation And Promoter Clearance and ATP/ITP metabolism. Gene Ontology (GO) annotations related to this gene include DNA-directed 5'-3' RNA polymerase activity and ribonucleoside binding. An important paralog of this gene is POLR2B.
UniProtKB/Swiss-Prot Summary for POLR3B Gene
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 III which synthesizes small RNAs, such as 5S rRNA and tRNAs. Proposed to contribute to the polymerase catalytic activity and forms the polymerase active center together with the largest subunit. Pol III is composed of mobile elements and RPC2 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). Plays a key role in sensing and limiting infection by intracellular bacteria and DNA viruses. Acts as nuclear and cytosolic DNA sensor involved in innate immune response. Can sense non-self dsDNA that serves as template for transcription into dsRNA. The non-self RNA polymerase III transcripts, such as Epstein-Barr virus-encoded RNAs (EBERs) induce type I interferon and NF- Kappa-B through the RIG-I pathway.