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High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
Structural organization of the RNA polymerase-promoter open complex
N Naryshkin1, A Revyakin, Y Kim
1Howard Hughes Medical Institute, Department of Chemistry, Rutgers University, Piscataway, New Jersey 08854, USA.
Cell
|July 13, 2000
Summary
Researchers mapped bacterial RNA polymerase (RNAP) interactions with promoter DNA using photocrosslinking. This detailed map reveals protein-DNA binding in the RNAP-promoter open complex (RPo) and how activators affect its structure.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Bacterial RNA polymerase (RNAP) is crucial for transcription initiation.
- Understanding RNAP-promoter DNA interactions in the open complex (RPo) is key to deciphering gene regulation.
- Previous models lacked detailed atomic-level resolution of these interactions.
Purpose of the Study:
- To precisely map protein-DNA interactions within the RNAP-promoter open complex (RPo).
- To build a detailed structural model of RPo based on experimental crosslinking data.
- To investigate the structural impact of transcriptional activators on RPo.
Main Methods:
- Employed systematic site-specific protein-DNA photocrosslinking.
- Mapped over 100 distinct crosslinks between RNAP subunits and promoter DNA phosphates.
- Utilized crosslinking data to construct a high-resolution structural model of RPo.
Main Results:
- Provided a comprehensive map of over 100 protein-DNA crosslinks in RPo.
- Established detailed contact points between specific RNAP segments and DNA phosphates.
- Enabled the construction of a refined structural model for the catalytically competent RPo.
Conclusions:
- The study offers an unprecedented detailed view of RNAP-promoter DNA interactions.
- The generated structural model of RPo serves as a foundation for understanding transcription initiation.
- The methodology allows for the analysis of how transcriptional activators modulate RPo structure.
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