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Lavergne, as well as V. Biogeochemical transformations of selenium in anoxic environments, p — Accumulation of premutagenic DNA lesions in mice defective in removal of oxidative base damage. Detection of SOD activity. Preparation of cell extracts and assay for dUTPase activity. We need many different skills. Journal List Appl Environ Microbiol v.

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In the environment, the reduction of these oxyanions occurs principally by biotic processes.

An important effect of the addition of selenite on the bacterial growth and resistance is therefore expected depending upon the presence or absence of oxygen. Four days after dissection of the spores on galactose plates, we observed microcolonies and slowly growing colonies Fig.

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Expand your business nationwide and abroad. The ligated DNA was then used directly as a dav for PCR amplification by using the oligonucleotide primers designed from the Tn 5 sequence: Detection of SOD activity. Here, we investigated the origin of endogenous AP sites in yeast.

Doetsch, and Sue Jinks-Robertson.

Beauchamp C, Fridovich I. Strain BG4 apn1 apn2 was crossed with CC ntg1 ntg2 rad1. Brown T A, Shrift A. To evaluate the role of Ung1, the apn1 rad1 ung1 strain was crossed with the apn2 mutant Fig.


Origin of Endogenous DNA Abasic Sites in Saccharomyces cerevisiae

Cells were grown to exponential phase in YPD medium and observed by microscopy in phase contrast left panels and after DAPI staining right panels. Each curve shows mean values based on the results of three experiments.

Interestingly, the homologous sodB gene in R. These data support the view that the polyol ABC transporter is involved in selenite transport to the cytoplasm.

Genetic effects of UV irradiation on excision-proficient and -deficient yeast during meiosis. Determination of the genotypes. In the present study, we combined biochemical and genetic approaches to better characterize the mechanisms of selenite reduction and toxicity in the photosynthetic bacterium R.

Although viable, the apn1 apn2 rad1 ung1 quadruple mutant presents growth defects characterized by increased doubling time, cellular abnormalities, and altered FACS profiles.

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We use cookies for statistical purposes and enhanced user experience. The tellurite-resistance determinants tehAtehB and klaAklaBtelB have different biochemical requirements.

This factor is found in various oxotransferases and hydroxylases 1415 and in particular in the highly specific selenate reductase purified from T. The combination of biochemical and genetic approaches emphasizes the oxidative properties of selenite under aerobic conditions and the involvement of a polyol transporter in the uptake of selenite in the photosynthetic bacterium R.

Cloning, nucleotide sequence, and overexpression of smoSa component of a novel operon encoding an ABC transporter and polyol dehydrogenases of Rhodobacter sphaeroides Si4. Evidence for two transporters of sulfur and selenium oxyanions in Clostridium pasteurianum.


Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Moore M D, Kaplan S. Furthermore, the apn1 apn2 rad1 ung1 mutant exhibits an extreme sensitivity to MMS compared to the sensitivity of the apn1 apn2 rad14 ung1 mutant Fig. Analysis of mutant strain colonies.

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After sporulation of the diploids, tetrads were dissected on YPD plates. Dvs important decrease in growth rate was observed for cells grown in the presence of selenite under dark aerobic conditions Fig.

Although viable, the apn1 apn2 rad1 ung1 quadruple mutant generates colonies smaller than those of 66422 WT, suggesting a growth defect. Mutants unable to reduce selenite. Regulatable promoters of Saccharomyces cerevisiae: Cell-free protein extracts were prepared as previously described Moreover, both UNG and DUT proteins in mammalian cells have two isoforms, one in the nucleus and another in mitochondria 25 ,