Excited-state structure and energy-transfer dynamics of two different preparations of the reaction center of photosystem II: A hole-burning study

Journal Article · Thu Aug 23 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100380a002· OSTI ID:6463889

Tang, D; Jankowiak, R; Small, G J ^[1]; Seibert, M ^[2]; Yocum, C F ^[3]

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1. Iowa State Univ., Ames (USA)
2. Solar Energy Research Institute, Golden, CO (USA)
3. Univ. of Michigan, Ann Arbor (USA)

Two distinctly different preparations of the D{sub 1}-D{sub 2}-cytochrome b-559 photosystem II reaction center (RC) complex are shown to exhibit very similar 4.2 K absorption and hole-burned spectra in glasses. Absorption profiles for P680 and the active pheophytin are fully characterized with the mean zero-point energy of P680{sup *} lying {approx}25 cm{sup {minus}1} lower in energy than the Q{sub y} state of the latter. Decay of the accessory chlorophyll and pheophytin Q{sub y} states due to energy transfer is shown to be about 3 orders of magnitude slower than in bacterial RC.

• OSTI ID: 6463889
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:17; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ABSORPTION SPECTROSCOPY
CARBOXYLIC ACIDS
CHLOROPHYLL
CYTOCHROMES
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
GLASS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC REACTION CENTERS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
PROTEINS
SPECTROSCOPY
ULTRALOW TEMPERATURE