NDLI: Origin and evolution of arthropod hemocyanins and related proteins

Content Provider	Springer Nature Link
Author	Burmester, T.
Copyright Year	2001
Abstract	Arthropod hemocyanins are large, multimeric, (n×6) copper-containing proteins that deliver oxygen in the haemolymph of many chelicerate, crustacean, myriapod, and also possibly some insect species. The arthropod hemocyanins belong to a large protein superfamily that also includes the arthropod phenoloxidases, certain crustacean and insect storage proteins (pseudo-hemocyanins and hexamerins), and the insect hexamerin receptors. Here I summarise the present knowledge of the origin, functional adaptations, and evolution of these proteins. Arthropod and mollusc hemocyanins are, if at all, only distantly related. As early as in the arthropod stem line, the hemocyanins emerged from a phenoloxidase-like enzyme. The evolution of distinct hemocyanin subunits, as well as the formation of multi-hexamers occurred independently within the arthropod subphyla. Hemocyanin subunit evolution is strikingly different in the Chelicerata, Myriapoda and Crustacea. Hemocyanins individually gave rise to two distinct copper-less storage proteins, the insect hexamerins and the crustacean pseudo-hemocyanins (cryptocyanins). The receptor responsible for the uptake of hexamerin by the larval fat body of the insects emerged from a hexamerin-precursor. Molecular phylogenetic analyses show a close relationship of the crustacean and insect proteins, providing strong support for a pancrustacean taxon, while structural data suggest a myriapod-chelicerate clade.
Starting Page	95
Ending Page	107
Page Count	13
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	172
Issue Number	2
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-12-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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