Abstract:
:We have isolated three strains of Klebsiella aerogenes that failed to show repression of glutamine synthetase even when grown under the most repressing conditions for the wild-type strain. These mutant strains were selected as glutamine-independent derivatives of a strain that is merodiploid for the glnA region and contains a mutated glnF allele. The mutation responsible for the Gln+ phenotype in each strain was tightly linked to glnA, the structural gene for glutamine synthetase, and was dominant to the wild-type allele. These mutations are probably lesions in the control region of the glnA gene, since each mutation was cis-dominant for constitutive expression of the enzyme in hybrid merodiploid strains. Strains harboring this class of mutations were unable to produce a high level of glutamine synthetase unless they also contained an intact glnF gene, and unless cells were grown in derepressing medium. This study supports the idea that the glnA gene is regulated both positively and negatively, and that the deoxyribonucleic acid sites critical for positive control and negative control are functionally distinct.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Rothstein DM,Magasanik Bdoi
10.1128/JB.141.2.671-679.1980subject
Has Abstractpub_date
1980-02-01 00:00:00pages
671-9issue
2eissn
0021-9193issn
1098-5530journal_volume
141pub_type
杂志文章abstract::We describe here the identification and characterization of two Listeria monocytogenes (Tn917-LTV3) relA and hpt transposon insertion mutants that were impaired in growth after attachment to a model surface. Both mutants were unable to accumulate (p)ppGpp in response to amino acid starvation, whereas the wild-type str...
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pub_type: 杂志文章
doi:10.1128/jb.176.19.5999-6006.1994
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pub_type: 杂志文章
doi:10.1128/JB.181.2.632-641.1999
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pub_type: 杂志文章
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.155.2.512-521.1983
更新日期:1983-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.93.2.716-721.1967
更新日期:1967-02-01 00:00:00
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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
doi:10.1128/jb.171.7.3940-3947.1989
更新日期:1989-07-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.123.2.755-758.1975
更新日期:1975-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.92.1.23-27.1966
更新日期:1966-07-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.179.8.2769-2771.1997
更新日期:1997-04-01 00:00:00
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pub_type: 杂志文章
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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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更新日期:1973-04-01 00:00:00
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pub_type: 杂志文章
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更新日期:1996-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1991-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2012-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2015-07-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:1994-06-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2011-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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更新日期:2012-02-01 00:00:00
abstract::The copy number and stability of artificial 2-micron circle-based plasmids have been accurately measured in [Cir+] and [Cir0] strains of Saccharomyces cerevisiae. We conclude that (i) instability and copy number vary greatly from plasmid to plasmid; (ii) instability and copy number are negatively correlated--that is, ...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.157.1.283-290.1984
更新日期:1984-01-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.187.16.5560-5567.2005
更新日期:2005-08-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.116.1.154-162.1973
更新日期:1973-10-01 00:00:00