PMID:15449955
| Citation |
Lew, CM and Gralla, JD (2004) Nucleotide-dependent isomerization of Escherichia coli RNA polymerase. Biochemistry 43:12660-6 |
|---|---|
| Abstract |
During promoter engagement, RNA polymerase must change conformation or isomerize to its active form. These data show that high concentrations of nucleotides assist this isomerization. When binding to fork junction DNA probes is monitored, isomerization can occur without the need for the DNA that overlaps the transcription start site. When the start site is present, nucleoside triphosphates cause polymerase to change conformation in a way that drives cross-linking to the +1 position on the template strand. Preincubation of transcription complexes with 2 mM initiating nucleotide can drive formation of heparin-resistant complexes under conditions in which isomerization is limiting. It is proposed that complete polymerase isomerization can require nucleotide binding, which can assist formation of the active site that engages the transcription start site. |
| Links |
PubMed Online version:10.1021/bi0492814 |
| Keywords |
Base Pairing; Binding Sites/genetics; Catalysis; Cross-Linking Reagents/chemistry; DNA Probes/chemistry; DNA, Bacterial/chemistry; DNA, Bacterial/genetics; DNA-Directed RNA Polymerases/chemistry; DNA-Directed RNA Polymerases/genetics; Deoxyribonucleotides/chemistry; Deoxyribonucleotides/genetics; Escherichia coli Proteins/chemistry; Escherichia coli Proteins/genetics; Hydrogen-Ion Concentration; Isomerism; Nucleic Acid Conformation; Peptide Chain Initiation, Translational/genetics; Protein Conformation; Sigma Factor/chemistry; Sigma Factor/genetics; Templates, Genetic; Transcription Initiation Site; Uridine Triphosphate/chemistry |
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