Abstract:
:Spontaneous mutants that were resistant to zinc were isolated from Alcaligenes eutrophus CH34 containing either the native plasmid pMOL28 or a derivative derepressed for its self-transfer, pMOL50. With the cured plasmid-free derivative of CH34, strain AE104, such mutants were not detected. The mutations, which were shown to be located in the plasmid, increased the level of the nickel and cobalt resistance determined by the cnr locus. The chromate resistance closely linked to the cnr locus was not affected by these mutations. In the Znr mutants, the resistance to zinc and nickel was constitutively expressed. Uptake studies showed that the zinc resistance in a Znr mutant resulted from reduced accumulation of zinc ions in comparison with that in the plasmid-free strain. Reduced accumulation of zinc was also observed to a lesser degree in the parental strain induced with nickel, suggesting that zinc interferes with the Ni2+ and Co2+ efflux system. A 12.2-kb EcoRI-XbaI restriction endonuclease fragment containing the cnr locus was cloned from plasmid pMOL28 harboring the mutation and shortened to an 8.5-kb EcoRI-PstI-PstI fragment conferring resistance to zinc, nickel, and cobalt. The 12.2-kb EcoRI-XbaI fragment was also reduced to a 9.7-kb BamHI fragment still encoding weak resistance to nickel and cobalt but not to zinc. Complementation studies demonstrated the recessivity of the cnr mutations with a Znr phenotype. Such mutations thus allow positive selection of mutants affected in the expression of the cnr operon.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Collard JM,Provoost A,Taghavi S,Mergeay Mdoi
10.1128/jb.175.3.779-784.1993subject
Has Abstractpub_date
1993-02-01 00:00:00pages
779-84issue
3eissn
0021-9193issn
1098-5530journal_volume
175pub_type
杂志文章abstract::Leucine and isoleucine-valine loci have been mapped in Rhizobium japonicum. Transformation analysis suggests a common pathway for isoleucine-valine biosynthesis. Three-point reciprocal crosses indicated that all the leucine loci are not genetically linked. ...
journal_title:Journal of bacteriology
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doi:10.1128/JB.126.2.997-998.1976
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journal_title:Journal of bacteriology
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pub_type: 杂志文章
doi:10.1128/JB.123.3.1150-1156.1975
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.171.4.1898-1903.1989
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.177.23.6727-6731.1995
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journal_title:Journal of bacteriology
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doi:10.1128/jb.177.2.401-412.1995
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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.169.2.483-488.1987
更新日期:1987-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.108.1.564-570.1971
更新日期:1971-10-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.100.1.365-369.1969
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journal_title:Journal of bacteriology
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doi:10.1128/JB.96.5.1803-1810.1968
更新日期:1968-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.94.2.378-382.1967
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journal_title:Journal of bacteriology
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doi:10.1128/JB.94.3.557-561.1967
更新日期:1967-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2000-08-01 00:00:00
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journal_title:Journal of bacteriology
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doi:10.1128/jb.165.3.831-836.1986
更新日期:1986-03-01 00:00:00
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journal_title:Journal of bacteriology
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doi:10.1128/JB.145.2.788-795.1981
更新日期:1981-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.123.3.1115-1123.1975
更新日期:1975-09-01 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:2002-12-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.170.10.4939-4941.1988
更新日期:1988-10-01 00:00:00
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更新日期:2005-09-01 00:00:00