Elongin A 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 is 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.[7]
↑"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
↑"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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Aso T, Haque D, Fukudome K, etal. (1996). "A human cDNA encoding the 110-kDa A subunit of RNA polymerase II transcription factor elongin". Gene. 168 (2): 277–8. doi:10.1016/0378-1119(95)00750-4. PMID8654961.