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Annual Review of Biophysics

Volume 47, 2018

Distinct Mechanisms of Transcription Initiation by RNA Polymerases I and II

Abstract

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.

Keyword(s): RNA polymerase, structural biology, transcription initiation
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2018-05-20
2024-04-18
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/content/journals/10.1146/annurev-biophys-070317-033058
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Distinct Mechanisms of Transcription Initiation by RNA Polymerases I and II
Annual Review of Biophysics 47, 425 (2018); https://doi.org/10.1146/annurev-biophys-070317-033058
/content/journals/10.1146/annurev-biophys-070317-033058
/content/journals/10.1146/annurev-biophys-070317-033058
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