Transcription elongation factor B polypeptide 1 - Q15369 (ELOC_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q15369: 33
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). (data source: UniProt  )
The elongin BC complex seems to be involved as an adapter protein in the proteasomal degradation of target proteins via different E3 ubiquitin ligase complexes, including the von Hippel-Lindau ubiquitination complex CBC(VHL). By binding to BC-box motifs it seems to link target recruitment subunits, like VHL and members of the SOCS box family, to Cullin/RBX1 modules that activate E2 ubiquitination enzymes. (data source: UniProt  )
Subunit structure
Heterotrimer of an A (A1, A2 or A3), B and C subunit. Part of E3 ubiquitin ligase complexes with CUL5 or CUL2, RBX1 and a substrate adapter protein that can be either SOCS1, SOCS5, TCEB3, VHL or WSB1. The elongin BC complex is part of a complex with hydroxylated HIF1A. Substrate adapter protein can be a viral protein such as HIV Vif. Interacts with VHL. Interacts with TMF1. Interacts with human respiratory syncytial virus (HRSV) protein NS1. Interacts with SPSB1. posed of LIMD1, VHL, EGLN1/PHD2, TCEB2 AND CUL2. Interacts with SPSB1. Interacts with KLHDC10; which may be an E3 ubiquitin ligase complex substrate recognition component. (data source: UniProt  )
Isoforms: 2, currently showing only the 'canonical' sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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