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The basal initiation machinery: beyond the general transcription factors Sikorski TW; Buratowski SCurr Opin Cell Biol 2009[Jun]; 21 (3): 344-51In vitro experiments led to a simple model in which basal transcription factors sequentially assembled with RNA Polymerase II to generate a preinitiation complex (PIC). Emerging evidence indicates that PIC composition is not universal, but promoter-dependent. Active promoters are occupied by a mixed population of complexes, including regulatory factors such as NC2, Mot1, Mediator, and TFIIS. Recent studies are expanding our understanding of the roles of these factors, demonstrating that their functions are both broader and more context dependent than previously realized.|*Transcription, Genetic[MESH]|Humans[MESH]|Models, Genetic[MESH]|Promoter Regions, Genetic[MESH]|RNA Polymerase II/genetics/*metabolism[MESH]|Transcription Factors/*metabolism[MESH] |
