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Map of Halobacterium sp. NRC-1 expression vector pDRK1. Relative size, location, and transcriptional orientation of bla gene (coding β-lactamase for ampicillin resistance), mev gene (coding HMG-CoA reductase for mevinolin resistance), rfa3 operon, and rep gene (coding Halobacterium pGRB1 replicase) are shown with arrows. Position of the gvpA promoter is indicated by an arrow and labeled P. Locations of KpnI, NdeI and BamHI restriction sites used for construction are indicated.
