H+ Ion Transport and Energy Transduction in Chloroplasts

1975 ◽  
pp. 49-107 ◽  
Author(s):  
Richard A. Dilley ◽  
Robert T. Giaquinta
Keyword(s):  
Ion Transport ◽  
Energy Transduction

Energy transduction, ion transport and protonmotive force: are they linked?

1984 ◽  
Vol 12 (3) ◽  
pp. 384-386 ◽  
Author(s):  
MARIA LUISA CAMPO ◽  
CHANGE-JIE ZHANG ◽  
HENRY TEDESCHI
Keyword(s):  
Ion Transport ◽  
Energy Transduction ◽  
Protonmotive Force

scholarly journals Impact of an electric field on P-type ATPases

2008 ◽  
Vol 22 (4) ◽  
pp. 319-325 ◽  
Author(s):  
Christian Weidemüller ◽  
Karin Hauser
Keyword(s):  
Electric Field ◽  
Ion Transport ◽  
Transmembrane Helix ◽  
Energy Transduction ◽  
Transmembrane Helices ◽  
Electrical Measurements ◽  
Transduction Mechanism ◽  
Charge Translocation ◽  
P Type ◽  
Hydrolysis Of

P-type ATPases are membrane proteins acting as ion pumps that drive an active transport of cations across the membrane against a concentration gradient. The required energy for the ion transport is provided by binding and hydrolysis of ATP. A reaction mechanism of ion transport and energy transduction is assumed to be common for all P-type ATPases and generally described by the Post-Albers cycle. Transient currents and charge translocation of P-type ATPases were extensively investigated by electrical measurements that apply voltage jumps to initiate the reaction cycle. In this study, we simulate an applied voltage across the membrane by an electric field and perform electrostatic calculations in order to verify the experimentally-driven hypothesis that the energy transduction mechanism is regulated by specific structural elements. Side chain conformational and ionization changes induced by the electric field are evaluated for each transmembrane helix and the selectivity in response is qualitatively analyzed for the Ca2+-ATPase as well as for structural models of the Na+/K+-ATPase. Helix M5 responds with more conformer changes as compared to the other transmembrane helices what is even more emphasized when the stalk region is included. Thus our simulations support experimental results and indicate a crucial role for the highly conserved transmembrane helix M5 in the energy transduction mechanism of P-type ATPases.

Artificial cells containing sustainable energy conversion engines

2019 ◽  
Vol 3 (5) ◽  
pp. 573-578 ◽  
Author(s):  
Kwanwoo Shin
Keyword(s):  
Energy Conversion ◽  
Nicotinamide Adenine Dinucleotide ◽  
Sustainable Energy ◽  
Living Cells ◽  
Energy Transduction ◽  
Artificial Cells ◽  
Energy Conversion Process ◽  
Metabolic Reactions ◽  
Metabolic Activities ◽  
Reduced Nicotinamide Adenine Dinucleotide

Living cells naturally maintain a variety of metabolic reactions via energy conversion mechanisms that are coupled to proton transfer across cell membranes, thereby producing energy-rich compounds. Until now, researchers have been unable to maintain continuous biochemical reactions in artificially engineered cells, mainly due to the lack of mechanisms that generate energy-rich resources, such as adenosine triphosphate (ATP) and reduced nicotinamide adenine dinucleotide (NADH). If these metabolic activities in artificial cells are to be sustained, reliable energy transduction strategies must be realized. In this perspective, this article discusses the development of an artificially engineered cell containing a sustainable energy conversion process.

Characterization of acetylcholine-induced ion transport in human duodenum

2001 ◽  
Vol 120 (5) ◽  
pp. A532-A532
Author(s):  
R LARSEN ◽  
M HANSEN ◽  
N BINSLEV ◽  
A MERTZNIELSEN
Keyword(s):  
Ion Transport
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