The RNA polymerase II general elongation factors.

Synthesis of eukaryotic messenger RNA by RNA polymerase II is governed by the concerted action of a set of general transcription factors that control the activity of polymerase during both the initiation and elongation stages of transcription. To date, five general elongation factors [P-TEFb, SII, TFIIF, Elongin (SIII) and ELL] have been defined biochemically. Here, we discuss these transcription factors and their roles in controlling the activity of the RNA polymerase II elongation complex.