Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/3859
Title: The triterpenes 3β-Lup-20(29)-en-3-ol and 3β-Lup-20(29)-en-3-yl acetate and the carbohydrate 1,2,3,4,5,6-Hexa-O-acetyl-dulcitol as photosynthesis light reactions inhibitors.
Authors: Oliveira, Djalma Menezes de
Aguilar, Maria Isabel
Díaz, Beatriz King
Vieira Filho, Sidney Augusto
Duarte, Lucienir Pains
Silva, Grácia Divina de Fátima
Hennsen, Blas Lotina
Keywords: Chlorophylla fluorescence
Lupeol
Maytenus acanthophylla
Uncoupler
Xylosma flexuosa
Issue Date: 2011
Citation: OLIVEIRA, D. M. et al. The triterpenes 3β-Lup-20(29)-en-3-ol and 3β-Lup-20(29)-en-3-yl acetate and the carbohydrate 1,2,3,4,5,6-Hexa-O-acetyl-dulcitol as photosynthesis light reactions inhibitors. Molecules, v. 16, p. 9939-9956, 2011. Disponível em: <http://www.mdpi.com/1420-3049/16/12/9939>. Acesso em: 20 ago. 2014.
Abstract: Three compounds were isolated from Maytenus acanthophylla Reissek (Celastraceae): the pentacyclic triterpenes lup-20(29)-en-3β-ol (lupeol, 1) and 3β-lup- 20(29)-en-3-yl acetate (2) and the carbohydrate 1,2,3,4,5,6-hexa-O-acetyldulcitol (3); lupeol was also isolated from Xylosma flexuosa. The compounds’ structures were elucidated by spectroscopic and spectrometric analysis. Compound 1 acts as an energy transfer inhibitor, interacting with isolated CF1 bound to thylakoid membrane, and dulcitol hexaacetate 3 behaves as a Hill reaction inhibitor and as an uncoupler, as determined by polarography. Chlorophyll a (Chl a) fluorescence induction kinetics from the minimum yield F0 to the maximum yield FM provides information of the filling up from electrons coming from water to plastoquinone pool with reducing equivalents. In this paper we have examined the effects of compounds 1 and 3 on spinach leaf discs. Compound 1 induces the appearance of a K-band, which indicates that it inhibits the water splitting enzyme. In vivo assays measuring the fluorescence of chl a in P. ixocarpa leaves sprayed with compound 1, showed the appearance of the K-band and the PSII reaction centers was transformed to “heat sinks” or silent reaction centers unable to reduce QA. However, 3 also induced the appearance of a K band and a new band I appears in P. ixocarpa plants, therefore it inhibits at the water splitting enzyme complex and at the PQH2 site on b6f complex. Compounds 1 and 3 did not affect chlorophyll a fluorescence of L. perenne plants.
URI: http://www.repositorio.ufop.br/handle/123456789/3859
metadata.dc.identifier.doi: https://doi.org/10.3390/molecules16129939
ISSN: 1420-3049
metadata.dc.rights.license: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Fonte: Molecules <http://www.mdpi.com/1420-3049/18/8/9919>. Acesso em: 08 set. 2014.
Appears in Collections:DEFAR - Artigos publicados em periódicos

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