A Third Site of Proton Translocation in Green Plant Photosynthetic Electron Transport

Prereduction of the intersystem pool in isolated spinach chloroplasts leads to the appearance of a slow phase in the field-indicating 515-nm change induced by a flash. Measurements with the pH-indicator dye cresol red show that a proton uptake is associated with this slow 515-nm change. When water i...

Full description

Saved in:
Bibliographic Details
Published inProceedings of the National Academy of Sciences - PNAS Vol. 75; no. 12; pp. 6031 - 6034
Main Author Velthuys, B. R.
Format Journal Article
LanguageEnglish
Published National Academy of Sciences of the United States of America 01.12.1978
Subjects
Algae
Chlorophylls
Chloroplasts
Cresols
Cytochromes
Electrical phases
Oxidation
Protons
Quinones
Thylakoids
Online AccessGet full text

Cover

More Information
Summary:Prereduction of the intersystem pool in isolated spinach chloroplasts leads to the appearance of a slow phase in the field-indicating 515-nm change induced by a flash. Measurements with the pH-indicator dye cresol red show that a proton uptake is associated with this slow 515-nm change. When water is the electron donor to photosystem II, electron transfer to ferricyanide is associated with the uptake of more than one proton per electron. Tetraphenylboron upon oxidation by system II releases a proton directly into the medium; yet, flash-induced electron transport from tetraphenylboron to ferricyanide is accompanied by a net uptake of protons from the medium. The above four results demonstrate the existence of two proton translocation sites in the chain between the two photoacts; the first two observations locate the new site at the oxidizing side of the plastoquinone pool.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.75.12.6031