Abstract
The intertidal marine snail, Littorina littorea, has evolved to survive bouts of anoxia and extracellular freezing brought about by changing tides and subsequent exposure to harsh environmental conditions. Survival in these anoxic conditions depends on the animals entering a state of metabolic rate depression in order to maintain an appropriate energy production-consumption balance during periods of limited oxygen availability. This study investigated the kinetic, physical, and regulatory properties of pyruvate kinase (PK), which catalyzes the final reaction of aerobic glycolysis, from foot muscle of L. littorea to determine if the enzyme is differentially regulated in response to anoxia and freezing exposure. PK purified from foot muscle of anoxic animals exhibited a lower affinity for its substrate phosphoenolpyruvate than PK from control and frozen animals. PK from anoxic animals was also more sensitive to a number of allosteric regulators, including alanine and aspartate, which are key anaerobic metabolites in L. littorea. Furthermore, PK purified from anoxic and frozen animals exhibited greater stability compared to the non-stressed control animals, determined through high-temperature incubation studies. Phosphorylation of threonine and tyrosine residues was also assessed and demonstrated that levels of threonine phosphorylation of PK from anoxic animals were significantly higher than those of PK from control and frozen animals, suggesting a potential mechanism for regulating PK activity. Taken together, these results suggest that PK plays a role in suppressing metabolic rate in these animals during environmental anoxia exposure.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This study was funded through a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant (#6793). K.B.S. holds the Canada Research Chair in Molecular Physiology. M.B.S was funded through an Ontario Graduate Scholarship. The authors thank J.M. Storey for editorial review of this manuscript.
Funding
This study was funded through a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grant (#6793). K.B.S. holds the Canada Research Chair in Molecular Physiology. M.B.S was funded through an Ontario Graduate Scholarship.
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MBS carried out experiments, analyzed the data, and helped draft the manuscript. AV analyzed the data and drafted the manuscript. SRG carried out experiments and revised the manuscript. KBS secured funding, conceived the experiments, and helped draft the manuscript. All authors read and approved the final manuscript.
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Smolinski, M.B., Varma, A., Green, S.R. et al. Purification and Regulation of Pyruvate Kinase from the Foot Muscle of the Anoxia and Freeze Tolerant Marine Snail, Littorina littorea. Protein J 39, 531–541 (2020). https://doi.org/10.1007/s10930-020-09934-9
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DOI: https://doi.org/10.1007/s10930-020-09934-9