Abstract
Nitrogenase is oxygen-labile. Cyanobacterial heterocysts can fix N(2) in an oxic milieu because their interior is micro-oxic, for which the glycolipid layer of the heterocyst envelope is required. ORF all5341 of the Anabaena sp. genome predicts a glycosyl transferase. An insertional mutant of all5341 synthesized only a nonglycosylated form of heterocyst envelope glycolipid, and lacked a glycolipid layer. All5341 appears to be the transferase required to glycosylate the glycolipid aglycone.
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