How does messenger RNA synthesis take place?

The conventional model for formation of a preinitiation complex and ordered transcription by RNA polymerase II (pol II) is characterized by a distinct series of events: (1) recognition of core promoter elements by TFIID (containing TBP and several other protein subunits), (2) recognition of and binding to the TFIID-promoter complex by TFIIB, (3) recruitment of a TFIIE/pol II complex by TFIIB, (4) binding of TFIIE (related to bacterial sigma) and TFIIH (containing a helicase required for promoter melting) to complete the preinitiation complex, (5) promoter melting and formation of an "open" initiation complex, (6) synthesis of the first phosphodiester bond of the nascent mRNA transcript, (7) release of pol II contacts with the promoter (promoter clearance, and (8) elongation of the RNA transcript. TFIIA can join the complex at any stage after TFIID binding and stabilizes the initiation complex. TFIID can remain bound to the core promoter supporting reinitiation of transcription.

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