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Abstract
Only two gas vesicle genes have been previously identified in the cyanobacteria, gvpA and gvpC, both of which encode structural gas vesicle proteins. Analysis of the nucleotide sequence immediately downstream of gvpC in the cyanobacterium Anabaena flos-aquae has revealed the presence of 4 ORFs (open reading frames) the products of which share significant homology with a number of the gene products derived from halobacterial gvp gene clusters. In halobacteria the gas vesicle gene clusters consist of 14 genes involved in gas vesicle synthesis and assembly. The product of Anabaena ORF 1, located immediately downstream of gvpC is homologous to halobacterial GvpNs. For the remaining ORFs the predicted gene products show homology to both GvpJ and GvpA for ORF 2, to GvpK and GvpA for ORF 3, and to both GvpF and GvpL for ORF 4.