Abstract:
:The two closely linked fdhD and fdhE genes of Escherichia coli are required for the formation of active membrane-bound phenazine methosulfate-linked formate dehydrogenase (FDH-PMS). Both genes were isolated from a cosmid library. Restriction endonuclease analysis associated with Mu dII1734 insertion mutagenesis indicated that the two genes were separated by at least 4 kilobases and transcribed in opposite orientations. Initial experiments indicate that the region between the two genes seems not to be essential to FDH-PMS activity. fdhD and fdhE were expressed either in maxicells or from the T7 promoter-polymerase system. They were shown to encode proteins with approximate Mr 30,500 and 32,000, respectively. Both proteins appeared in the soluble fraction and were not recognized by an FDH-PMS-specific antiserum. Therefore, neither fdhD nor fdhE plays a structural role in the formation of FDH-PMS. Expression of a phi(fdhD-lacZ) operon fusion was decreased about threefold by aerobiosis but was indifferent to other effectors tested. It was unaffected by pfl, chlA, selA, and fnr mutations. Expression of a phi(fdhE-lacZ) operon fusion was slightly induced by nitrate. This induction, requiring the presence of functional chl and fnr alleles, was mediated via nitrate metabolism. Transcription of phi(fdhE-lacZ) fusion was fully dependent on wild-type sel alleles. This might suggest the participation of fdhE in the synthesis of the selenopolypeptide of FDH-PMS.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Schlindwein C,Giordano G,Santini CL,Mandrand MAdoi
10.1128/jb.172.10.6112-6121.1990subject
Has Abstractpub_date
1990-10-01 00:00:00pages
6112-21issue
10eissn
0021-9193issn
1098-5530journal_volume
172pub_type
杂志文章abstract::The M-band technique was used to assess the number of attachment points of DNA to the cell membrane of Streptococcus faecalis grown at three different rates. Cells were X irradiated in liquid nitrogen and then analyzed simultaneously for the introduction of double-strand breaks into the chromosome and the degree of re...
journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of bacteriology
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更新日期:1988-04-01 00:00:00
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1971-06-01 00:00:00
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更新日期:2007-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:1989-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:1989-10-01 00:00:00