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Knaff DB. Active transport in phototrophic bacteria. Photosynth Res. 1986;10(3):507-14doi: 10.1007/BF00118317.
Knaff, D. B. (1986). Active transport in phototrophic bacteria. Photosynthesis research, 10(3), 507-14. https://doi.org/10.1007/BF00118317
Knaff, D B. "Active transport in phototrophic bacteria." Photosynthesis research vol. 10,3 (1986): 507-14. doi: https://doi.org/10.1007/BF00118317
Knaff DB. Active transport in phototrophic bacteria. Photosynth Res. 1986 Jan;10(3):507-14. doi: 10.1007/BF00118317. PMID: 24435399.
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Photosynth Res. 1986 Jan;10(3):507-14. doi: 10.1007/BF00118317.

Active transport in phototrophic bacteria.

Photosynthesis research

D B Knaff

Affiliations

  1. Department of Chemistry and Biochemistry, Texas Tech University, 79409-4260, Lubbock, Texas, (U.S.A.).

PMID: 24435399 DOI: 10.1007/BF00118317

Abstract

Phototrophic bacteria utilize light-driven, cyclic electron flow to pump protons out of their cytoplasm, creating an electrochemical proton gradient, ΔμH+, outside acid and positive. These bacteria exchange external protons for internal cations (Na(+), K(+) and Ca(+2)), allowing the cells to maintain a nearly constant internal pH while maintaining the electrical component of ΔμH+. Na(+)/H(+) exchange also establishes an electrochemical Na(+) gradient. Phototrophic bacteria are able to utilize these electrochemical gradients as energy sources for the uptake of a wide variety of metabolites (e.g., sugars, organic acids and amino acids) via metabolite/cation symports.

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