Two inhibition targets by [Cr(2gb)(3)](3+) and [Co(2gb)(3)](3+) on redox enzymes of spinach thylakoids. |
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Authors: | A E Ceniceros-Gómez B King-Díaz N Barba-Behrens B Lotina-Hennsen S E Castillo-Blum |
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Institution: | Departamento de Química Inorgánica, Universidad Nacional Autónoma de México. |
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Abstract: | Cr(2gb)(3)]Cl(ZnCl(4)), Cr(2gb)(3)]Cl(3), and Co(2gb)(3)]Cl(3) were synthesized and characterized. Their chemical structures and the oxidation states of their metal centers remained unchanged in solution. The effects of these compounds, CrCl(3) and Co(NH(3))(6)]Cl(3), on photosynthesis were investigated. The coordination compounds inhibit ATP synthesis and electron flow (basal, phosphorylating, and uncoupled), behaving as Hill reaction inhibitors. The target for Cr(2gb)(3)]Cl(ZnCl(4)) is located at the Q(B) level. In contrast, the interaction sites of Cr(2gb)(3)]Cl(3) and Co(2gb)(3)]Cl(3) are located in the span from P(680) to Q(A) and at the b(6)f complex. Neither CrCl(3) nor Co(NH(3))(6)]Cl(3) inhibited photosynthesis. The 100% inhibition on PS II of Cr(2gb)(3)]Cl(ZnCl(4)) is explained in terms of a synergystic effect between the 2gb-chromium(III) coordination compound and the ZnCl(4)(2)(-) anion. |
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