Temperature Sensitivity of Molluscan and Arthropod Hemocyanins
نویسندگان
چکیده
منابع مشابه
Evolution of arthropod hemocyanins and insect storage proteins (hexamerins).
Crustacean and cheliceratan hemocyanins (oxygen-transport proteins) and insect hexamerins (storage proteins) are homologous gene products, although the latter do not bind oxygen and do not possess the copper-binding histidines present in the hemocyanins. An alignment of 19 amino acid sequences of hemocyanin subunits and insect hexamerins was made, based on the conservation of elements of second...
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cDNA clones comprising the entire coding region of two out of the seven heterogeneous subunits of hemocyanin from the tarantula, Eurypelma californicum, were isolated from four cDNA libraries constructed from total RNA from the heart tissue of single spiders. Hybridization was first carried out using a tarantula hemocyanin subunit e partial cDNA, and several positive clones were isolated, inclu...
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Cryptocyanin, a copper-free hexameric protein in crab (Cancer magister) hemolymph, has been characterized and the amino acid sequence has been deduced from its cDNA. It is markedly similar in sequence, size, and structure to hemocyanin, the copper-containing oxygen-transport protein found in many arthropods. Cryptocyanin does not bind oxygen, however, and lacks three of the six highly conserved...
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This review summarizes recent highlights of our joint work on the structure, evolution, and function of a family of highly complex proteins, the hemocyanins. They are blue-pigmented oxygen carriers, occurring freely dissolved in the hemolymph of many arthropods and molluscs. They are copper type-3 proteins and bind one dioxygen molecule between two copper atoms in a side-on coordination. They p...
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Bursting pacemaker neurons of Tritonia and Aplysia were studied in voltage-clamp experiments to determine the ionic requirements of the slow outward tail current. This current is important for terminating bursts and hyperpolarizing the neuron during the interval between bursts and therefore contributes to the timing of pacemaker activity. A method for rapid extracellular perfusion of the neuron...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1988
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1541782