Abstract：
:Microbial flavohaemoglobins are proteins with homology to haemoglobins from higher organisms, but clearly linked to nitric oxide (NO) metabolism by bacteria and yeast. hmp mutant strains of several bacteria are hypersensitive to NO and related compounds and hmp genes are up-regulated by the presence of NO. The regulatory mechanisms involved in hmp induction by NO and the superoxide-generating agent, methyl viologen (paraquat; PQ), are complex, but progressively being resolved. Here we show for the first time that, in Salmonella enterica serovar Typhimurium, hmp transcription is increased on exposure to PQ and demonstrate that RamA, a homologue of MarA is responsible for most of the hmp paraquat regulation. In addition we demonstrate NO-dependent elevation of Salmonella hmp transcription and Hmp accumulation. In both Escherichia coli and Salmonella modest transcriptional repression of hmp is exerted by the iron responsive transcriptional repressor Fur. Finally, in contrast to previous reports, we show that in E. coli and Salmonella, hmp induction by both paraquat and sodium nitroprusside is further elevated in a fur mutant background, indicating that additional regulators are implicated in this control process.
journal_name
Arch Microbioljournal_title
Archives of microbiologyauthors
Hernández-Urzúa E,Zamorano-Sánchez DS,Ponce-Coria J,Morett E,Grogan S,Poole RK,Membrillo-Hernández Jdoi
10.1007/s00203-006-0175-8subject
Has Abstractpub_date
2007-01-01 00:00:00pages
67-77issue
1eissn
0302-8933issn
1432-072Xjournal_volume
187pub_type
杂志文章abstract：:A Gram-reaction-negative, facultatively anaerobic bacterium, designated SAP-19T, was isolated from sap extracted from Acer pictum in Mt. Halla in Jeju, Republic of Korea and its taxonomic statue was investigated by a polyphasic approach including genome- and 16S rRNA gene-based phylogenetic analyses. Cells were motile...
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journal_title：Archives of microbiology
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doi：10.1007/BF00454856
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pub_type： 杂志文章,评审
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journal_title：Archives of microbiology
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journal_title：Archives of microbiology
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journal_title：Archives of microbiology
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