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RNA polymerases I and II (Pol I and Pol II) are the eukaryotic enzymes that catalyze DNA-dependent synthesis of ribosomal RNA and messenger RNA, respectively. Recent work shows that the transcribing forms of both enzymes are similar and the fundamental mechanisms of RNA chain elongation are conserved. However, the mechanisms of transcription initiation and its regulation differ between Pol I and Pol II. Recent structural studies of Pol I complexes with transcription initiation factors provided insights into how the polymerase recognizes its specific promoter DNA, how it may open DNA, and how initiation may be regulated. Comparison with the well-studied Pol II initiation system reveals a distinct architecture of the initiation complex and visualizes promoter- and gene-class-specific aspects of transcription initiation. On the basis of new structural studies, we derive a model of the Pol I transcription cycle and provide a molecular movie of Pol I transcription that can be used for teaching.
Authors : Engel Christoph , Neyer Simon , Cramer Patrick ,
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WP1066: Eukaryotic Transcription Initiation
WP1182: Eukaryotic Transcription Initiation
WP1238: Eukaryotic Transcription Initiation
WP177: Eukaryotic Transcription Initiation
WP344: Eukaryotic Transcription Initiation
WP405: Eukaryotic Transcription Initiation
WP425: Eukaryotic Transcription Initiation
WP491: Eukaryotic Transcription Initiation
WP518: Eukaryotic Transcription Initiation
WP567: Eukaryotic Transcription Initiation
WP830: Eukaryotic Transcription Initiation
WP948: Eukaryotic Transcription Initiation
WP1541: Energy Metabolism
WP1812: Eukaryotic Translation Initiation
WP1822: Generic Transcription Pathway
WP1905: RNA Polymerase I, RNA Polymerase III, and Mitochondrial Transcription
WP1906: RNA Polymerase II Transcription
WP2108: flower development (initiation)
WP2185: Purine metabolism
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