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Light‐harvesting in Acaryochloris marina – spectroscopic characterization of a chlorophyll d ‐dominated photosynthetic antenna system
Author(s) -
Schiller Hilmar,
Senger Horst,
Miyashita Hideaki,
Miyachi Shigetoh,
Dau Holger
Publication year - 1997
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(97)00620-0
Subject(s) - chlorophyll a , chlorophyll , photosynthesis , chemistry , antenna (radio) , botany , biology , telecommunications , computer science
Oxygenic photosynthesis of the prokaryote Acaryochloris marina involves chlorophyll d (Chl d ) as the major pigment [Miyashita et al. (1996) Nature 383, 402]. Four spectral forms of Chl d (peak wavelengths: 694, 714, 726 and 740 nm) are resolvable by low‐temperature absorption spectroscopy on intact cells. Based on fluorescence spectra (at 290 K and 77 K) and on analysis of fluorescence induction curves we conclude: (1) excitation energy is efficiently transferred between the various spectral forms of Chl d and the PS II reaction center; (2) Chl d serves as a light‐harvesting pigment for both, Photosystem II (PS II) and PS I; (3) excitation energy transfer between PS II units occurs.