STUDIES ON CHROMOPHORE COUPLING IN ISOLATED PHYCOBILIPROTEINS .3. PICOSECOND EXCITED-STATE KINETICS AND TIME-RESOLVED FLUORESCENCE-SPECTRA OF DIFFERENT ALLOPHYCOCYANINS FROM MASTIGOCLADUS-LAMINOSUS

被引:58
作者
HOLZWARTH, AR [1 ]
BITTERSMANN, E [1 ]
REUTER, W [1 ]
WEHRMEYER, W [1 ]
机构
[1] UNIV MARBURG, FACHBEREICH BIOL BOT, W-3550 MARBURG, GERMANY
关键词
D O I
10.1016/S0006-3495(90)82514-5
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The excited state kinetics of three different allophycocyanin (AP) complexes has been studied by picosecond fluorescence spectroscopy. Both the fluorescence kinetics and the decay-associated fluorescence spectra of the different complexes can be understood on the basis of a structural model for AP which uses (a) an analogy to the known x-ray determined structure of C-phycocyanin, (b) the biochemical analogies of AP and C-phycocyanin, and (c) the biochemical composition of AP-B (AP-681). A model is developed that describes the excited state kinetics as a mixture of internal conversion processes within a coupled exciton pair and energy transfer processes between exciton pairs. We found excited state relaxation times in the range of 13 ps (AP with linker peptide) up to 66 ps (AP-B). The trimeric aggregates AP 660 and AP 665 show one fast relaxation component each, as was expected on the basis of their symmetry properties. The lower symmetry of AP-B (AP-681) gives rise to two fast lifetime components (τ1 = 23 ps and τ2 = 66 ps) which are attributed to internal conversion and/or energy transfer between excitonic states formed by the coupling of symmetrically and spectrally nonequivalent chromophores. It is proposed that the internal conversion between exciton states of strongly coupled chromophores fulfills the requirements of the small energy gap limit. Thus, internal conversion rates in the order of tens of picoseconds are feasible. The influence of the interaction of the linker peptide on the properties of the AP trimer are manifested in the fluorescence kinetics. Lack of the linker peptide in AP 660 gives rise to a heterogeneity in the chromophore conformations and chromophore-chromophore interactions. © 1990, The Biophysical Society. All rights reserved.
引用
收藏
页码:133 / 145
页数:13
相关论文
共 50 条
  • [1] Bevington P., 1969, DATA REDUCTION ERROR, P1
  • [2] BITTERSMANN E, 1988, PHOTOSYNTHETIC LIGHT, P451
  • [3] ELECTRONIC RELAXATION IN LARGE MOLECULES
    BIXON, M
    JORTNER, J
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1969, 50 (09) : 4061 - &
  • [4] Braslavsky S. E., 1983, ANGEW CHEM, V95, P670
  • [5] BRASLAVSKY SE, 1980, ISR J CHEM, V20, P196
  • [6] CIRCULAR-DICHROISM AND POLARIZED FLUORESCENCE CHARACTERISTICS OF BLUE-GREEN-ALGAL ALLOPHYCOCYANINS
    CANAANI, OD
    GANTT, E
    [J]. BIOCHEMISTRY, 1980, 19 (13) : 2950 - 2956
  • [7] EXCITATION-ENERGY TRANSFER BETWEEN SENSITIZING CHROMOPHORES OF PHYCOCYANIN-612
    CSATORDAY, K
    MACCOLL, R
    GUARDFRIAR, D
    HANZLIK, CA
    [J]. PHOTOCHEMISTRY AND PHOTOBIOLOGY, 1987, 45 (06) : 845 - 848
  • [8] THE DEVELOPMENT OF EXCITON MIGRATION ROUTES FOR PHYCOCYANIN-645 AND ALLOPHYCOCYANIN
    CSATORDAY, K
    GUARDFRIAR, D
    MACCOLL, R
    BERNS, DS
    [J]. PHOTOCHEMISTRY AND PHOTOBIOLOGY, 1988, 47 (02) : 285 - 291
  • [9] EXCITON INTERACTION IN ALLOPHYCOCYANIN
    CSATORDAY, K
    MACCOLL, R
    CSIZMADIA, V
    GRABOWSKI, J
    BAGYINKA, C
    [J]. BIOCHEMISTRY, 1984, 23 (26) : 6466 - 6470
  • [10] ANALYSIS OF FLUORESCENCE KINETICS AND ENERGY-TRANSFER IN ISOLATED ALPHA-SUBUNITS OF PHYCOERYTHRIN FROM NOSTOC SP
    DAGEN, AJ
    ALFANO, RR
    ZILINSKAS, BA
    SWENBERG, CE
    [J]. PHOTOCHEMISTRY AND PHOTOBIOLOGY, 1986, 43 (01) : 71 - 79