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Title: Sugar metabolism in the extremely halophilic bacterium Salinibacter ruber. Author: Oren A, Mana L. Journal: FEMS Microbiol Lett; 2003 Jun 06; 223(1):83-7. PubMed ID: 12799004. Abstract: Growth of Salinibacter ruber, a red, extremely halophilic bacterium phylogenetically affiliated with the Flavobacterium/Cytophaga branch of the domain Bacteria, is stimulated by a small number of sugars (glucose, maltose, starch at 1 g l(-1)). Glucose consumption starts after other substrates have been depleted. Glucose metabolism proceeds via a constitutive, salt-inhibited hexokinase and a constitutive salt-dependent nicotinamide adenine dinucleotide phosphate (NADP)-linked glucose-6-phosphate dehydrogenase. Glucose dehydrogenase and fructose-1,6-bisphosphate aldolase activity could not be detected. It is therefore suggested that Salinibacter metabolizes glucose by the classic Entner-Doudoroff pathway and not by the Embden-Meyerhof glycolytic pathway or by the modified Entner-Doudoroff pathway present in halophilic Archaea of the family Halobacteriaceae, in which the phosphorylation step is postponed. However, activity of 2-keto-3-deoxy-6-phosphogluconate aldolase could not be detected in extracts of Salinibacter cells, whether or not grown in the presence of glucose.[Abstract] [Full Text] [Related] [New Search]