Abstract
Calvin cycle carbon dioxide fixation genes encoded on DNA fragments from two nonphotosynthetic, chemolithoautotrophic bacteria, Bradyrhizobium japonicum and Xanthobacter flavus, were found to complement and support photosynthetic growth of a ribulose 1,5-bisphosphate carboxylase-oxygenase (RubisCO) deletion mutant of the purple nonsulfur bacterium Rhodobacter sphaeroides. The regulation of RubisCO expression was analyzed in the complemented R. sphaeroides RubisCO deletion mutant. Distinct differences in the regulation of RubisCO synthesis were revealed when the complemented R. sphaeroides strains were cultured under photolithoautotrophic and photoheterotrophic growth conditions, e.g., a reversal in the normal pattern of RubisCO gene expression. These studies suggest that sequences and molecular signals which regulate the expression of diverse RubisCO genes may be probed by using the R. sphaeroides complementation system.
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