Abstract
Uptake of alanine and its nonmetabolizable analog α-aminoisobutyric acid (AIB) by the photosynthetic purple sulfur bacterium Chromatium vinosum is stimulated fivefold by Na +. Neither Li + nor K + have any stimulatory effect. AIB uptake can be supported by a Na + gradient in the absence of other energy sources. AIB uptake is also accompanied by Na + uptake. These results suggest that AIB is taken up by C. vinosum via a sodium symport. Cells of C. vinosum and the purple nonsulfur bacterium Rhodospirillum rubrum show energy-dependent Na + efflux and Na + uptake can be demonstrated with chromatophores prepared from these bacteria.
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