title: Role of LHCII organization in the interaction of substituted 1,4-anthraquinones with thylakoid membranes.
abstract: The chlorophyll fluorescence, photochemical activity and surface electric properties of thylakoid membranes with different stoichiometry of pigment-protein complexes and organization of the light-harvesting chlorophyll a/b protein complex of photosystem II (LHCII) were studied in the presence of substituted 1,4-anthraquinones. Data show strong dependence of the quenching of the chlorophyll fluorescence on the structural organization of LHCII. The increase of the LHCII oligomerization, which is associated with significant reduction of the transmembrane electric charge asymmetry and electric polarizability of the membrane, correlates with enhanced quenching effect of substituted 1,4-athraquinones. Crucial for the large quinone-induced changes in the membrane electric dipole moments is the structure of the quinone molecule. The strongest reduction in the values of the dipole moments is observed after interaction of thylakoids with 3-chloro-9-hydroxy-1,4-anthraquinone (TF33) which has the highest quenching efficiency. The quinone induced changes in the photochemical activity of photosystem II (PSII) correlate with the total amount of the supramolecular LHCII-PSII complex and depend on the number of substituents in the 1,4-anthraquinone molecule.
authors.affiliation: Institute of Biophysics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., B1.21, Sofia 1113, Bulgaria. emya@obzor.bio21.bas.bg
authors.forename: Emilia
authors.initials: E
authors.lastname: Apostolova
authors.forename: Sashka
authors.initials: S
authors.lastname: Krumova
authors.forename: Tzvetelina
authors.initials: T
authors.lastname: Markova
authors.forename: Tzvetanka
authors.initials: T
authors.lastname: Filipova
authors.forename: Maria T
authors.initials: MT
authors.lastname: Molina
authors.forename: Ivana
authors.initials: I
authors.lastname: Petkanchin
authors.forename: Stefka G
authors.initials: SG
authors.lastname: Taneva
mesh_terms: D000880:Anthraquinones / Q000737:chemistry* / Q000378:metabolism*; D009154:Mutation / Q000235:genetics; D018532:Pisum sativum / Q000201:enzymology / Q000235:genetics; D010777:Photochemistry; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D055672:Static Electricity; D020524:Thylakoids / Q000378:metabolism*
chemical_list: D000880:Anthraquinones; D045332:Photosystem II Protein Complex; C416442:1,4-anthraquinone