Specific binding of formylated initiator-tRNA to Escherichia coli RNA polymerase.
AUTOR(ES)
Pongs, O
RESUMO
E. coli fMet-tRNAfMEet and E. coli RNA plymerase (RNA nucleotidyltransferase; EC 2.7.7.6; nucleoside-triphosphate:RNA nucleotidyltransferase) form a 1:1 complex with an apparent association constant of 9.0 X 10(6)M-1 at 37 degrees. The affinity of polymerase to tRNA depends on the tRNA as well as the formyl methionine moiety. Core polymerase has a greatly reduced affinity for initiator tRNA. Optimal binding conditions are similar to those that are also optimal for binding initiator tRNA to ribosomes. Binding of initiator tRNA to polymerase stimulates the transcription of lambda plac DNA, as determined in a crude cell-free system for beta-galactosidase (EC 3.2.1.23; beta-D-galactoside galactohydrolase) synthesis as well as in a highly purified transcription system.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=430930Documentos Relacionados
- I protein: bacteriophage T7-coded inhibitor of Escherichia coli RNA polymerase.
- Template specific inhibitors of E. coli RNA polymerase.
- Conformational change of Escherichia coli initiator methionyl-tRNAfMet upon binding to methionyl-tRNA formyl transferase
- Escherichia coli mutant which restricts T7 bacteriophage has an altered RNA polymerase.
- Purification and properties of a bacteriophage T5-modified form of Escherichia coli RNA polymerase.
