Adaptive response and enhancement of N-methyl-N'-nitro-N-nitrosoguanidine mutagenesis by chloramphenicol in Streptomyces fradiae.

نویسندگان

  • R H Baltz
  • J Stonesifer
چکیده

Streptomyces fradiae expressed an adaptive response to treatment with small doses of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) that caused a reduction in mutagenesis by treatment with larger doses of MNNG. Treatment of S. fradiae with high levels of MNNG in the presence of chloramphenicol caused enhancement of mutagenesis, independent of the adaptive response.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Adaptive response of Bacillus subtilis to N-methyl-N'-nitro-N-nitrosoguanidine.

Cell extracts of Bacillus subtilis contain a methyltransferase that appears to remove the O6-methyl group from O6-methylguanine in DNA in situ. This reaction proceeds in a stoichiometric fashion, as in Escherichia coli. However, the basal level of the enzyme (approximately 240 molecules per cell) is significantly higher in B. subtilis than in E. coli. In addition, the methyltransferase level in...

متن کامل

Improved Production of Rhamnolipids by a Pseudomonas aeruginosa Mutant

A Pseudomonas aeruginosa mutant derived by random mutagenesis with N-methyl-N¢-nitro-N-nitrosoguanidine, producing high levels of the rhamnolipid biosurfactants was selected on Siegmund-Wagner (SW) plates. The mutant designated P. aeruginosa PTCC1637 produces rhamnolipids at concentrations 10 time more than parent strain. NMR analysis and surface tension measurement showed that the biosurfactan...

متن کامل

Postreplication repair and the susceptibility of Chinese hamster cells to cytotoxic and mutagenic effects of alkylating agents.

A cell variant (VR-43) resistant to the cytotoxic effect of N-methyl-N'-nitro-N-nitrosoguanidine and N-methyl-N'-nitro-N-nitrosourea was isolated from Chinese hamster V79 cells for use in studies of the relationship among cell survival, mutagenesis, and DNA repair by alkylating agents. Resistance to ouabain or 6-thioguanine was used as the genetic marker. After treatment with N-methyl-N'-nitro-...

متن کامل

Mutagenesis of Micromonospora rosaria by using protoplasts and mycelial fragments.

Both mycelial fragments and protoplasts were successfully employed for mutagenesis of Micromonospora rosaria NRRL 3718, and the results were compared. The optimal conditions and effective procedures for mutagenesis of M. rosaria by a chemical mutagen, N-methyl-N'-nitro-N-nitrosoguanidine, have been determined. Mutation was efficiently induced when mycelial fragments were treated with N-methyl-N...

متن کامل

Cosynthesis and protoplast fusion by mutants of bialaphos (AMPBA) producing Streptomyces hygroscopicus.

Cosynthesis in mixed culture and protoplast fusion of non-producing mutants of Streptomyces hygroscopicus which may produce biosynthetic intermediates of bialaphos (AMPBA) were studied. Non-producing mutants were obtained by mutagenesis with N-methyl-N'-nitro-N-nitrosoguanidine (NTG) treatment, and six stable non-producing mutants were used for cosynthesis and protoplast fusion studies. The bio...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Journal of bacteriology

دوره 164 2  شماره 

صفحات  -

تاریخ انتشار 1985