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• W2101981014 endingPage "104" @default.
• W2101981014 startingPage "83" @default.
• W2101981014 abstract "Heterocysts are differentiated cyanobacterial cells whose principal known function is the fixation of dinitrogen (N2), an oxygen (O2)-sensitive process, under aerobic conditions. Cyclic AMP, which plays a role in signal transduction in prokaryotes as well as eukaryotes, is present in Anabaena sp., is responsive to nitrogen deprivation, and can disrupt the normal pattern of heterocyst formation. In Anabaena sp., nitrate assimilation responds rapidly to nitrogen deprivation. The contiguous genes nirA, encoding nitrite reductase; nrtA, -B, - C, and -D, encoding nitrate transport proteins; and narB, encoding nitrate reductase, are rapidly and strongly induced in response to nitrogen stepdown. The fatty acyl portion of such lipids might be expected to be generated by a fatty acid or polyketide synthase. Indeed, it was found that mutations in closely positioned genes denoted hetN and hgIB (hetM), hgIC, and hgID that encode proteins that show a potential functional relationship to such synthases resulted in a lack of heterocyst envelope glycolipids. By means of a diversity of genetic approaches, including transposon mutagenesis, complementation of mutations induced by UV light and chemicals, response to added cosmids, and site-specific mutagenesis, numerous other genes that participate in differentiation of Anabaena sp. have been identified. There may be independent regulation of the formation of the glycolipid and polysaccharide portions of the heterocyst envelope and of the (as yet little studied) maturation of the interior of the heterocyst." @default.
• W2101981014 created "2016-06-24" @default.
• W2101981014 creator A5050570238 @default.
• W2101981014 date "2014-04-08" @default.
• W2101981014 modified "2023-10-17" @default.
• W2101981014 title "Heterocyst Formation in<i>Anabaena</i>" @default.
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