Open AccessTranscriptional regulation of pseudobactin synthesis in the plant growth‐promoting Pseudomonas B10
Author(s) -
Leoni Livia,
Ambrosi Cecilia,
Petrucca Andrea,
Visca Paolo
Publication year - 2002
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2002.tb11085.x
Subject(s) - pseudomonas , biology , gene , sigma factor , transcription (linguistics) , transcriptional regulation , gene expression , regulation of gene expression , function (biology) , oxygenase , microbiology and biotechnology , genetics , biochemistry , bacteria , promoter , linguistics , philosophy
We have investigated the iron‐dependent regulation of the psbA gene, encoding the enzyme l ‐ornithine N 5 ‐oxygenase in the rhizobacterium Pseudomonas B10. We have cloned and characterized a Pseudomonas B10 gene, designated psbS , required for psbA expression. PsbS is endowed with structural and functional features of extracytoplasmatic function (ECF) sigma factors, and is closely related to the iron starvation sigmas PvdS, PbrA, and PfrI, which mediate the iron‐repressible expression of pseudobactin biosynthesis genes in different Pseudomonas species. Expression of psbA was found to be indirectly controlled by Fur, which abrogates psbS transcription in the presence of sufficient iron.