The effects of sublethal concentrations of zinc, cadmium and mercury on Euglena

Complexation of Heavy Metal Cations Hg, Cd, and Pb with Proteins of PSII: Evidence for Metal–Sulfur Binding and Protein Conformational Transition by FTIR Spectroscopy

“…We thetic electron transport. It reacts with many sites in the believe that the use of FTIR difference spectroscopy with photosynthetic membranes; meanwhile, the PSII reaction its self-deconvolution and second derivative resolution encenter is the most sensitive target at both the donor and the hancement measurements will enable us to detect the subacceptor sides (1). The high toxicity of Cd ion for plants is tle structural changes associated with the metal ion binding well known; it is also shown that the Cd cation inhibits site and the quantitative analysis of protein conformation, photosynthetic electron transport and the activity of the PSII, even in a large protein complex such as PSII reaction cenaffecting the water splitting and oxygen evolution (2).…”

Impact of Heavy Metals on Water Loss from Lichen Thalli

“…Inhibition of chlorophyll biosynthesis with a toxic level of Pb in Pennisetum typhoideum seedling (Prasad and Prasad, 1987) and in algae (De Filippis and Pallaghy, 1976;De Filippis et al, 1981) has been ascribed to its interaction with functional sulfhydryl (SH) groups. Thus, the difference in dehydration with a toxic level of Pb in two species of Cladonia must be due to their differences in intracellular Pb uptake, which is indicated by the inverse relation of Pb accumulation and K + efflux in the two species.…”

Effects on the Photosynthetic Activity of Algae after Exposure to Various Organic and Inorganic Pollutants: Review

“…Moreover, toxic metals cause the inhibition of enzyme activities that are important in photosynthetic pathway. For example, it was found that Cd 2+ , Zn 2+ , and Hg 2+ inhibited the NADP-oxidoreductase in Euglena, thereby significantly lowering the cell supply of NADPH [138], whereas Cu 2+ was shown to inhibit plasma membrane H + -ATPase activity in Nitella flexis [139]. Several enzymes involved in the Calvin cycle are also inhibited, especially Rubisco (bisphosphate carboxylase oxygenase) and PEPcarboxylase [132,136].…”