Non-linear arrhenius plots and the analysis of reaction and motional rates in biological membranes
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Role of Δ<sup>1</sup>-pyrroline-5-carboxylate dehydrogenase supports mitochondrial metabolism and host-cell invasion of Trypanosoma cruzi
2015, Journal of Biological ChemistryCitation Excerpt :However, similar results have been described for enzymes that are insensitive to thermal inactivation (85). Nonlinear Arrhenius plots can be observed even if the T range is not large, as has been observed for the enzymatic oxidation of γGS (86, 87). This pattern is particularly evident for many enzymatic biochemical reactions occurring in membranes.
Effects of temperature on rates and mineral products of microbial Fe(II) oxidation by Leptothrix cholodnii at microaerobic conditions
2013, Geochimica et Cosmochimica ActaCitation Excerpt :However, in the second stage, both microbial and abiotic rate constants fit the Arrhenius equation (Fig. 4), indicating that with the accumulation of precipitates, further oxidation may be controlled by abiotic oxidation on existing iron oxides. Enzyme activity typically exhibits an optimum temperature and non-linear Arrhenius plots are commonly observed for the optimal growth and biochemical activity of prokaryotes and fungi (Silvius et al., 1978; Mohr and Krawiec, 1980; Silvius and McElhaney, 1981; Ratkowsky et al., 1982, 1983; Franzmann et al., 2005). The temperature dependency of enzyme activity may reflect changes in, for example, the enzyme-substrate complex, enzyme-membrane-complex or changes in lipid structure of enzyme-membrane complexes (Silvius et al., 1978; Mohr and Krawiec, 1980; Silvius and McElhaney, 1981; Truhlar and Kohen, 2001).
Thermodynamics of cuticular transpiration
2011, Journal of Insect PhysiologyCitation Excerpt :Thus, non-linear Arrhenius plots would be caused by changes in the enthalpy of activation. In many cases, no supporting biophysical measurements were performed, and theoretical analysis suggested that sharp breakpoints in membrane protein activity were unlikely (Silvius and McElhaney, 1981). When water-loss rates from insects are plotted using the Arrhenius equation, transition temperatures can disappear, suggesting that transpiration through the cuticle is a relatively simple process.
A functionally inactive, cold-stabilized form of the Escherichia coli F<inf>1</inf>F<inf>o</inf> ATP synthase
2006, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :The results presented here also have important implications for interpretations of the temperature dependence of rates of ATP hydrolysis by the E. coli ATP synthase. Cold temperature deactivation of an enzyme could lead to breaks in an Arrhenius plot, as has been discussed by Silvius et al. [53,54]. Membrane-dependent effects on the temperature dependence of ATP hydrolysis have been reported with the E. coli enzyme [55].
Stopped-flow kinetic analysis of the interaction of Escherichia coli RNA polymerase with the bacteriophage T7 A1 promoter
1998, Journal of Molecular BiologyMagnetic resonance imaging of tissue-specific thermal responses of geranium stem in vivo
1997, Journal of Thermal Biology