A gene cluster located downstream from gvpA in the cyanobacterium Pseudanabaena sp. strain PCC 6901 has been cloned and sequenced. The three genes, orf1, gvpN and gvpJ, are consecutive with no intergenic region. In contrast to GvpN and GvpJ, which share high similarity at the amino acid level with their counterparts in other cyanobacteria and halophilic archaea, Orf1 is only 29% identical to the C-terminal part of GvpC from Anabaena flos-aquae and its sequence organization is reminiscent of the halophilic archaeal GvpC.
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Albouy et al. (2001) studied this question.
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