Transcription Elongation Factor B Polypeptide 1 (TCEB1) Antibody – Rabbit Polyclonal

This gene encodes the protein elongin C, which is a subunit of the transcription factor B (SIII) complex. The SIII complex is composed of elongins A/A2, B and C. It activates elongation by RNA polymerase II by suppressing transient pausing of the polymerase at many sites within transcription units. Elongin A functions as the transcriptionally active component of the SIII complex, whereas elongins B and C are regulatory subunits. Elongin A2 is specifically expressed in the testis, and capable of forming a stable complex with elongins B and C. The von Hippel-Lindau tumor suppressor protein binds to elongins B and C, and thereby inhibits transcription elongation. Multiple alternatively spliced transcript variants encoding two distinct isoforms have been identified. [provided by RefSeq, Mar 2011]

TCEB1: SIII, also known as elongin, is a general transcription elongation factor that increases the RNA polymerase II transcription elongation past template-encoded arresting sites. Subunit A is transcriptionally active and its transcription activity is strongly enhanced by binding to the dimeric complex of the SIII regulatory subunits B and C (elongin BC complex). Belongs to the SKP1 family.

Protein type: Transcription initiation complex

Chromosomal Location of Human Ortholog: 8q21.11

Cellular Component: cytosol; nucleoplasm

Molecular Function: protein binding; ubiquitin-protein ligase activity

Biological Process: gene expression; positive regulation of RNA elongation from RNA polymerase II promoter; positive regulation of viral transcription; protein ubiquitination during ubiquitin-dependent protein catabolic process; regulation of transcription from RNA polymerase II promoter; RNA elongation from RNA polymerase II promoter; transcription from RNA polymerase II promoter; viral reproduction