Interference by nickel(II) salts and their 5-methylimidazole-4-carboxylate coordination compounds on the chloroplast redox chain

B. King-Diaz, N. Barba-Behrens, J. Montes-Ayala, S. E. Castillo-Blum, C. Escartin-Guzman, R. Iglesias-Prieto, B. Lotina-Hennsen

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Abstract

Nickel(II) salts and their coordination compounds with ethyl 5-methylimidazole-4-carboxylate (emizco), [Ni(emizco)2Cl2], [Ni(emizco)2Br2], [Ni(emizco)2(H2O)2](NO3)2·H2O, Ni(NO3)2, inhibit photosynthetic electron flow (basal, phosphorylating and uncoupled) and ATP-synthesis, therefore behave as Hill reaction inhibitors. Coordination compounds are more potent inhibitors than the salts. It was found that the target for NiCl2; NiBr2 and Ni(NO3)2 is at the b6f level. On the other hand, the complexes [Ni(Emizco)2Cl2], [Ni(Emizco)2Br2] and [Ni(emizco)2(H2O)2](NO3)2·H2O binding sites are located at Q(B)(D1)-protein and b6f level. Therefore, they have a common inhibition site located at b6f avoiding the PQH2 oxidation. The Q(B) inhibition site was corroborated by variable chlorophyll a fluorescence yield [V(j)]. The emizco ligand has no activity on photosynthetic electron flow.

Original languageEnglish (US)
Pages (from-to)987-994
Number of pages8
JournalZeitschrift fur Naturforschung - Section C Journal of Biosciences
Volume53
Issue number11-12
DOIs
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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