TY - JOUR
T1 - Interference by nickel(II) salts and their 5-methylimidazole-4-carboxylate coordination compounds on the chloroplast redox chain
AU - King-Diaz, B.
AU - Barba-Behrens, N.
AU - Montes-Ayala, J.
AU - Castillo-Blum, S. E.
AU - Escartin-Guzman, C.
AU - Iglesias-Prieto, R.
AU - Lotina-Hennsen, B.
N1 - Funding Information:
This work was supported by grant DGAPA IN222096 and B. King-Diaz acknowledges the fellowship awarded by CONACyT, Mexico. We also thank RP Fierro for technical support.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
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U2 - 10.1515/znc-1998-11-1209
DO - 10.1515/znc-1998-11-1209
M3 - Article
AN - SCOPUS:0032443348
SN - 0939-5075
VL - 53
SP - 987
EP - 994
JO - Zeitschrift fur Naturforschung - Section C Journal of Biosciences
JF - Zeitschrift fur Naturforschung - Section C Journal of Biosciences
IS - 11-12
ER -