Premium
Application of Molecular Orbital Calculations to Interpret the Chlorophyll Spectral Forms in Pea Photosystem II ¶
Author(s) -
Nishigaki Atsuko,
Ohshima Shigeru,
Nakayama Katsumi,
Okada Mitsumasa,
Nagashima Umpei
Publication year - 2001
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/0031-8655(2001)0730245aomoct2.0.co2
Subject(s) - oscillator strength , photosystem ii , photosystem i , chlorophyll , chlorophyll a , chemistry , amino acid , light harvesting complex , molecular orbital , absorption (acoustics) , photosynthesis , photochemistry , spectral line , physics , molecule , optics , biochemistry , quantum mechanics , organic chemistry
The energy and oscillator strength of electronic transitions of chlorophyll (Chl)–amino acid complexes were calculated by using molecular orbital methods. The energies varied widely with coordinated amino acids and the difference between the maximum and minimum energy was about 830 cm −1 . This energy difference was comparable with the spreading of absorption bands for light‐harvesting Chl–protein complexes of photosystem II (LHC II) of green plants. The feature of the Q y band for pea LHC II was interpreted with the aid of the calculated energies and oscillator strengths. Four spectral components of the band were assigned to individual Chl–amino acid complexes.