Abstract
One may question the degree to which physiological adaptations of multisubunit oxygen carrying proteins to the requirements of diverse organisms are based on the existence of structurally and functionally distinct types of subunits. This question can be most easily addressed through studies of the hemocyanins, where multiple types of subunits can self-assemble into truly giant molecules with highly developed allosteric properties. A consideration of our present knowledge concerning subunit differences leads rather directly to the conclusion that both the assembly of the high molecular weight aggregates found in vivo and their physiological function may be directly related to the types of subunits present. Much of our present understanding has come from study of the structure, function and assembly of the chelicerate hemocyanins, present in the horseshoe crabs, scorpions, and spiders. Only recently has it been possible to perform comparable experiments with crustacean hemocyanins. One crustacean hemocyanin, that of the lobster Panulirus interrupts, has proven to be a good model system for studies of subunit diversity. We find that in this system the diverse subunits differ in their ability to self-assemble, in their relative sensitivities to calcium and magnesium, and, of particular physiological importance, in the extent to which an organic cofactor can modulate their oxygen binding properties. Studies with hemocyanin of the garden snail, Helix pomatia and of the sea snail, Murex fulvescens, can be cited as evidence for the presence of diverse subunits that contribute significantly to the assembly and function of molluscan hemocyanins.
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Bonaventura, J., Bonaventura, C. (1985). Physiological Adaptations and Subunit Diversity in Hemocyanins. In: Lamy, J., Truchot, JP., Gilles, R. (eds) Respiratory Pigments in Animals. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70616-5_3
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DOI: https://doi.org/10.1007/978-3-642-70616-5_3
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