TY - JOUR
T1 - A photosystem I reaction center driven by chlorophyll d in oxygenic photosynthesis
AU - Hu, Qiang
AU - Miyashita, Hideaki
AU - Iwasaki, Ikuko
AU - Kurano, Norihide
AU - Miyachi, Shigetoh
AU - Iwaki, Masayo
AU - Itoh, Shigeru
PY - 1998/10/27
Y1 - 1998/10/27
N2 - 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.
AB - 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.
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U2 - 10.1073/pnas.95.22.13319
DO - 10.1073/pnas.95.22.13319
M3 - Article
C2 - 9789086
AN - SCOPUS:0032573105
SN - 0027-8424
VL - 95
SP - 13319
EP - 13323
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 22
ER -