Journal ArticleDOI
Isoenzymes and short-term temperature compensation in poikilotherms: activation of lactate dehydrogenase isoenzymes by temperature decreases.
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TLDR
For all enzymes from poikilotherms examined, enzyme-substrate (E-S) affinity varies inversely with temperature over a large portion of the species' range of habitat temperatures.Abstract:
AT physiological substrate concentrations, the rates of enzymatic reactions of poikilotherms may be highly independent of temperature1–5. The basis of this effect has recently been clarified: for all enzymes from poikilotherms which we have examined, enzyme-substrate (E-S) affinity varies inversely with temperature over a large portion of the species' range of habitat temperatures. In addition, E-S affinity frequently reaches a maximum at temperatures near the lower extreme of the species' habitat temperatures3–5.read more
Citations
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The effects of temperature on aerobic metabolism: towards a mechanistic understanding of the responses of ectotherms to a changing environment
TL;DR: A view of why current theories provide an inadequate mechanistic account of the effects of temperature on aerobic metabolic processes across levels of organization from individual proteins to intact animals is presented.
Journal ArticleDOI
Biochemical Adaptation to the Environment
TL;DR: It is proposed that adult poikilotherms may undergo a considerable degree of “biochemical restructuring” on a seasonal basis, and the factors which control this “restructuring,” and the rates at which the process occurs at high and low temperatures are topics for future investigation.
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The effect of temperature on the respiratory electron transport system in marine plankton
TL;DR: In this paper, the effect of temperature on the respiratory electron transport system in plankton was studied in a plankton population between 10 and 45°N lat in the eastern Pacific Ocean.
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Cold shocks: a stressor for common carp
TL;DR: Fish that had experienced multiple cold shocks showed an overall lower cortisol response than fish experiencing a single cold shock, indicating that habituation to this stressor occurred.
References
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Journal ArticleDOI
Lactate Dehydrogenase Isozymes: Dissociation and Recombination of Subunits
TL;DR: Lactate dehydrogenase from beef tissues may be resolved electrophoretically into five isozymes each of which is a tetramer, which can be dissociated into monomers by freezing in 1M sodium chloride.
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The adaptation of enzymes to temperature
TL;DR: The results suggest that in evolutionary adaptation to temperature, enzyme affinity for substrate is a feature more sensitive to natural selection than is molecular activity per se.
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Enzymic Mechanisms of Temperature Compensation: Immediate and Evolutionary Effects of Temperature on Enzymes of Aquatic Poikilotherms
TL;DR: The sharp decreases in enzyme-substrate affinity which frequently occur at the extremes of an organism's habitat temperature may be important in establishing thermal tolerance limits for the organism.
Journal ArticleDOI
The effect of temperature on catalytic and regulatory functions of pyruvate kinases of the rainbow trout and the Antarctic fish Trematomus bernacchii
TL;DR: It is concluded that enzyme-substrate and enzyme-modulator interactions are important factors in short-term and in evolutionary adaptations by poikilotherms to changes in temperature.
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Enzymic Mechanisms of Temperature Compensation: Immediate and Evolutionary Effects of Temperature on Enzymes of Aquatic Poikilotherms
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