Serratia and survive various environments such as the

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Last updated: July 12, 2019

Serratia is a gram negative opportunistic pathogen that is able to produce the antibiotic 1-carbapen-2-carboxylic acid and the red pigment prodigiosin. The bacterium causes nosocomial infections and as a result has become an issue due to its multidrug resistant nature due to the fact that it tends to cause nosocomial infections. It is also able to colonize and survive various environments such as the soil water air and plants because of their ability to produce a variety of extracellular products including proteases, lipases, chitinases, nucleases, surfactants and wetting agents.Prodigiosin is a red pigment that plays a role in the survival of Serratia species.

Prodigiosin is a secondary metabolic pathway produced between trophophase and idiophase of bacterial growth. It is a product of a bifurcated pathway, formed by the condensation of the terminal products of the MBC and MAP pathways. Prodigiosin is known to perform immunosuppressant activities without affecting antibody formation. Prodigiosin has also been shown to be antimalarial, antifungal, antibacterial and antiprotozoal. An operon is a functional unit of DNA that regulates the other genes involved in protein synthesis.The genes involved in prodigiosin biosynthesis are pigA-o. Pig A is resonsible for L-Prolyl-PCP dehydrogenase, pigC is responsible for phosphotransferase, pigE is responsible for aminotransferase, pigF  is responsible for O-Methyltransferase, pigG is responsible for peptidyl carrier protein (PCP), pigH is responsible for aminotransferase, pigI is responsible for L-Prolyl-AMP ligase, pigJ is resonsible for b-Ketomyristol-ACP synthase, pigL is responsible for 4′-Phosphopantetheinyltransferase, pigN is rresposible for oxidoreductase pigB, pifgD, pigK, pigM, and pigO have have no assigned function. It is presumed that the pig cluster is organised from pigA-pigN.

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The comids pNRT1 and pNRT104 were identified using cosmid complementation and were found to be similar to the E. carotovora cosmid cWU142 that was known to have the car-related genes. Southern blotting hybridization was then performed to detect non vector homology. The fragment was then cloned and sequenced. The sequencing revealed 8 open reading frames downstream from the carR gene. A chromosomal library was used to modify the E.

coli. The pNRT104 co plasmid was transferred into E. carotovora colonies using transponses and the colonies produced a red pigment indicating that pNRT104 cosmid was the prodigiosin gene sequence. Restriction analyses were used to isolate genes and sequencing showed that the cluster contained 14 genes.

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