Caulobacter Crescentus
Mostrando 13-24 de 340 artigos, teses e dissertações.
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13. Characterization of the systems ChrR-sigmaR and CC3476-sigmaT in the responses to oxidative and osmotic stresses in C. crescentus / Caracterização dos sistemas ChrR-σR e CC3476σT na resposta de C. crescentus aos estresses oxidativo e osmótico
Caulobacter crescentus is among the bacteria whose genomes encode a high number of ECF sigma factors, which are involved in the transcriptional regulation of a limited set of genes in response to several environmental signals. In the present work, two ECF sigma factors from C. crescentus, σR e σT, were functionally characterized. Data showed that &
Publicado em: 2008
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14. Isolamento e caracterização de mutantes de Caulobacter deficientes na adaptação à fase estacionária
A entrada em fase estacionária causa uma mudança no padrão de expressão gênica de bactérias, quando as células devem expressar um novo conjunto de genes envolvidos principalmente com resistência à carência alimentar e a estresses ambientais. Em uma tentativa de identificar genes importantes para a sobrevivência de Caulobacter crescentus em fase es
Brazilian Journal of Microbiology. Publicado em: 2003-04
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15. Clonagem e caracterização do gene que codifica a endopeptidase PepF da bactéria aquática Caulobacter crescentus
As metalopeptidases têm papel importante em bactérias, estando envolvidas em vários processos que dependem de reciclagem de proteínas, como nutrição, degradação de peptídios-sinal, localização de proteínas e virulência. Nós clonamos e caracterizamos o gene da metaloendopeptidase PepF da bactéria aquática Caulobacter crescentus. O gene a monta
Brazilian Journal of Microbiology. Publicado em: 2002-01
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16. Cell cycle expression of the heat shock groESL operon in Caulobacter crescentus / Expressão do operon de choque térmico groESL durante o ciclo celular de Caulobacter crescentus
Caulobacter crescentus is an aquatic free-living Gram-negative bacterium whose cell cycle depends on cell differentiation. The asymmetrical predivisional cell gives rise to two morphologically and functionally different daughter cells: the swarmer cell an the stalked cell. The expression of the groESL operon is induced by heat shock and is cell cycle control
Publicado em: 1999
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17. Caulobacter crescentus Mutants with Short Stalks
Limitation of inorganic phosphate in the culture medium allows stalk elongation in wild-type Caulobacter crescentus. Mutants unable to form long stalks were isolated.
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18. Conditions that trigger guanosine tetraphosphate accumulation in Caulobacter crescentus.
Caulobacter crescentus accumulated guanosine tetraphosphate in response to nitrogen starvation but not in response to amino acid starvation. Nitrogen starvation also acted specifically to inhibit certain transitions in the C. crescentus life cycle, and guanosine tetraphosphate may act as an intracellular regulator of cell cycle events.
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19. Transposition of Tn7 Occurs at a Single Site on the Caulobacter crescentus Chromosome
Insertion of Tn7 in nine independently derived isolates occurred in a single small region of the Caulobacter crescentus chromosome, suggesting that Tn7 insertion occurs at or near a single site. The order of markers in this region of the Caulobacter chromosome was shown to be flaA-argG-Tn7.
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20. Isolation of Spontaneously Derived Mutants of CAULOBACTER CRESCENTUS
Caulobacter crescentus has a penicillinase which precludes the use of penicillin for mutant enrichment. However, two other antibiotics, fosfomycin and D-cycloserine, can be used to enrich for C. crescentus mutants. In enrichment procedures for C. crescentus auxotrophs, spontaneously derived mutants occur at a frequency of 5–10% among the survivors of an e
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21. Gamma-ray sensitivity during synchronous cell differentiation in Caulobacter crescentus.
Gamma-ray sensitivity of Caulobacter crescentus during its cell cycle was examined. Survival curves of the swarmer and stalked cells were similar and exponential in shape, whereas that of the predivisional cell was sigmoidal, with an extrapolation number of 1.8.
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22. Specific Assay for Differentiation in the Stalked Bacterium Caulobacter crescentus*
The bacterium Caulobacter crescentus carries out a distinct differentiation process during its life cycle. Cultures of the bacterium have been synchronized and an assay has been developed for monitoring the course of morphogenesis by the selective adsorption of radioactive RNA bacteriophage.
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23. An Escherichia coli chemoreceptor gene is temporally controlled in Caulobacter.
Flagellar and chemotaxis genes are transcribed at a discrete time in the Caulobacter cell cycle. We demonstrate here that the expression of the Escherichia coli chemoreceptor gene tsr, with 2.6 kilobases of its upstream sequence, is temporally controlled in Caulobacter crescentus. The tsr gene was placed on the chromosome in single copy or on a low-copy-numb
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24. A ferredoxin, designated FdxP, stimulates p-hydroxybenzoate hydroxylase activity in Caulobacter crescentus.
A gene, fdxP, was identified upstream of the rrnA gene in Caulobacter crescentus and shown to encode ferredoxin II (FdII) by insertional inactivation. FdII is homologous to a class of [2Fe-2S] ferredoxins typified by putidaredoxin. Furthermore, reconstitution assays demonstrated that FdII was able to promote p-hydroxybenzoate hydroxylase activity in ferredox