pbpB, a gene coding for a putative penicillin-binding protein, is required for aerobic nitrogen fixation in the cyanobacterium Anabaena sp. strain PCC7120.

Abstract excerpt

Transposon mutagenesis of Anabaena sp. strain PCC7120 led to the isolation of a mutant strain, SNa1, which is unable to fix nitrogen aerobically but is perfectly able to grow with combined nitrogen (i. e., nitrate). Reconstruction of the transposon mutation of SNa1 in the wild-type strain reproduced the phenotype of the original mutant. The transposon had inserted within an open reading frame whose translation...

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