A photosystem I reaction center driven by chlorophyll d in oxygenic photosynthesis

Qiang Hu, Hideaki Miyashita, Ikuko Iwasaki, Norihide Kurano, Shigetoh Miyachi, Masayo Iwaki, Shigeru Itoh

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169 Scopus citations


A far-red type of oxygenic photosynthesis was discovered in Acaryochloris marina, a recently found marine prokaryote that produces an atypical pigment chlorophyll d (Chl d). The purified photosystem I reaction center complex of A. marina contained 180 Chl d per 1 Chl a with PsaA-F, -L, -K, and two extra polypeptides. Laser excitation induced absorption changes of reaction center Chl d that was named P740 after its peak wavelength. A midpoint oxidation reduction potential of P740 was determined to be +335 mV. P740 uses light of significantly low quantum energy (740 nm= 1.68 eV) but generates a reducing power almost equivalent to that produced by a special pair of Chl a (P700) that absorbs red light at 700 nm (1.77 eV) in photosystem I of plants and cyanobacteria. The oxygenic photosynthesis based on Chl d might either be an acclimation to the far-red light environments or an evolutionary intermediate between the redabsorbing oxygenic and the far- red absorbing anoxygenic photosynthesis that uses bacteriochlorophylls.

Original languageEnglish (US)
Pages (from-to)13319-13323
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number22
StatePublished - Oct 27 1998

ASJC Scopus subject areas

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