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• W2127672085 endingPage "1419" @default.
• W2127672085 startingPage "1410" @default.
• W2127672085 abstract "ABSTRACT To study the importance of arginine provision and phosphate limitation for synthesis and accumulation of cyanophycin (CGP) in Acinetobacter sp. strain ADP1, genes encoding the putative arginine regulatory protein ( argR ) and the arginine succinyltransferase ( astA ) were inactivated, and the effects of these mutations on CGP synthesis were analyzed. The inactivation of these genes resulted in a 3.5- or 7-fold increase in CGP content, respectively, when the cells were grown on glutamate. Knockout mutations in both genes led to a better understanding of the effect of the addition of other substrates to arginine on CGP synthesis during growth of the cells of Acinetobacter sp. strain ADP1. Overexpression of ArgF (ornithine carbamoyltransferase), CarA-CarB (small and large subunits of carbamoylphosphate synthetase), and PepC (phosphoenolpyruvate carboxylase) triggered synthesis of CGP if amino acids were used as a carbon source whereas it was not triggered by gluconate or other sugars. Cells of Acinetobacter sp. strain ADP1, which is largely lacking genes for carbohydrate metabolism, showed a significant increase in CGP contents when grown on mineral medium supplemented with glutamate, aspartate, or arginine. The Acinetobacter sp. ΔastA (pYargF) strain is unable to utilize arginine but synthesizes more arginine, resulting in CGP contents as high as 30% and 25% of cell dry matter when grown on protamylasse or Luria-Bertani medium, respectively. This recombinant strain overcame the bottleneck of the costly arginine provision where it produces about 75% of the CGP obtained from the parent cells grown on mineral medium containing pure arginine as the sole source of carbon. Phosphate starvation is the only known trigger for CGP synthesis in this bacterium, which possesses the PhoB/PhoR phosphate regulon system. Overexpression of phoB caused an 8.6-fold increase in CGP content in comparison to the parent strain at a nonlimiting phosphate concentration." @default.
• W2127672085 created "2016-06-24" @default.
• W2127672085 creator A5073026173 @default.
• W2127672085 creator A5076768521 @default.
• W2127672085 date "2006-02-01" @default.
• W2127672085 modified "2023-09-27" @default.
• W2127672085 title "Engineering the Genotype of <i>Acinetobacter</i> sp. Strain ADP1 To Enhance Biosynthesis of Cyanophycin" @default.
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• W2127672085 doi "https://doi.org/10.1128/aem.72.2.1410-1419.2006" @default.
• W2127672085 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1392963" @default.
• W2127672085 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16461694" @default.
• W2127672085 hasPublicationYear "2006" @default.
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