Summary σ54 is unique among the bacterial sigma factors. Besides not being related in
sequence with the rest of such factors, its mechanism of transcription initiation is completely …

The cellular levels of the alternative sigma factor σ54 of Pseudomonas putida have been
examined in a variety of growth stages and culture conditions with a single-chain Fv …

Bacterial enhancer binding proteins (bEBPs) are transcriptional activators that assemble as
hexameric rings in their active forms and utilize ATP hydrolysis to remodel the conformation …

The initiation of transcription is the most important step for gene regulation in eubacteria. To
initiate transcription, RNA polymerase has to associate with a small protein, known as a σ …

The σ 54-factor controls expression of a variety of genes in response to environmental cues.
Much previous work has implicated the nucleotide alarmone ppGpp and its co-factor DksA in …

SUMMARY ς54 has several features that distinguish it from other sigma factors in
Escherichia coli: it is not homologous to other ς subunits, ς54-dependent expression …

Alignment of sigma 54-dependent promoters indicates conservation of two sequence
elements. Six nucleotides in the downstream− 12 element were mutated individually to each …

Transcription by RNA polymerase utilizing the alternative sigma factor σ54 is regulated by a
distinct class of positive activators designated the σ54‐dependent family. The activities of …

A truncated derivative of the XylR protein, which is able to constitutively activate the σ54-
dependentPupromoter of the TOL (toluene biodegradation) plasmid ofPseudomonas putida …

Summary σ28 controls the expression of flagella‐related genes and is the most widely
distributed alternative σ factor, present in motile Gram‐positive and Gram‐negative bacteria …