Regulating the proton budget of higher plant photosynthesis.
In higher plant chloroplasts, transthylakoid proton motive force serves both to drive the synthesis of ATP and to regulate light capture by the photosynthetic antenna to prevent photodamage. In vivo probes of the proton circuit in wild-type and a mutant strain of Arabidopsis thaliana show that regulation of light capture is modulated primarily by altering the resistance of proton efflux from the thylakoid lumen, whereas modulation of proton influx through cyclic electron flow around photosystem I is suggested to play a role in regulating the ATP/NADPH output ratio of the light reactions.
Institute of Biological Chemistry, 289 Clark Hall, Washington State University, Pullman, WA 99164-6340, USA.
Thomas J
TJ
Avenson
Jeffrey A
JA
Cruz
Atsuko
A
Kanazawa
David M
DM
Kramer
D000255:Adenosine Triphosphate / Q000378:metabolism; D017360:Arabidopsis / Q000502:physiology*; D001692:Biological Transport / Q000502:physiology; D015153:Blotting, Western; D002245:Carbon Dioxide / Q000378:metabolism; D017097:Electric Impedance; D004579:Electron Transport / Q000502:physiology; D008027:Light; D009249:NADP / Q000378:metabolism; D010788:Photosynthesis / Q000502:physiology*; D045331:Photosystem I Protein Complex / Q000502:physiology*; D011522:Protons; D013050:Spectrometry, Fluorescence; D020524:Thylakoids / Q000378:metabolism* / Q000502:physiology
D045331:Photosystem I Protein Complex; D011522:Protons; D002245:Carbon Dioxide; D009249:NADP; D000255:Adenosine Triphosphate