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An episode of accelerated amino acid change in Drosophila esterase-6 associated with a change in physiological function

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Abstract

In most lineages of the subgenus Sophophora esterase-6 is a homodimeric haemolymph protein. In the melanogaster subgroup of species it has become a monomer which is mainly expressed in the male sperm ejaculatory duct. Our analyses of esterase-6 sequences from three melanogaster subgroup species and two close relatives reveal a brief period of accelerated amino acid sequence change during the transition between the ancestral and derived states. In this period of 2–6Myr the ratio of replacement to silent site substitutions (0.51) is about three times higher than the values in other lineages of the phylogeny. There are about 50 more replacements in this period than would be predicted from the ratios of replacement to silent site substitutions found elsewhere in the phylogeny. Modelling on the known structure of a related acetylcholinesterase suggests that an unusually high proportion of the replacements in the transitional branch are non-conservative changes on the protein surface. Up to half the accelerated replacement rate can be accounted for by clusters of changes to the face of the molecule containing the opening of the active site gorge. This includes changes in and around regions homologous to peripheral substrate binding sites in acetylcholinesterase. There are also three changes in glycosylation status. One region predicted to lie on the protein surface which becomes markedly more hydrophilic is proposed to be the ancestral dimerisation site that is lost in the transitional branch.

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Authors and Affiliations

  1. Division of Entomology, Commonwealth Scientific and Industrial Research Organisation, G.P.O. Box 1700, Canberra, Australian Capital Territory, 2601, Australia

    J.G. Oakeshott

  2. Division of Entomology, Commonwealth Scientific and Industrial Research Organisation, G.P.O. Box 1700, Canberra, Australian Capital Territory, 2601, Australia

    E.A. van Papenrecht, C. Claudianos, B.C. Morrish, C. Coppin & W.A. Odgers

  3. Division of Botany and Zoology, Australian National University, Australian Capital Territory, 0200, Australia

    E.A. van Papenrecht

  4. Department of Biology, University of York, P.O. Box 373, York, YO10 5YW, UK

    B.C. Morrish

  5. Division of Biochemistry and Molecular Biology, Australian National University, Australian Capital Territory, 0200

    C. Coppin

  6. Agriculture, Fisheries and Forestry, P.O. Box 858, Canberra, Australian Capital Territory, 2601, Australia

    W.A. Odgers

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Oakeshott, J., Papenrecht, E.v., Claudianos, C. et al. An episode of accelerated amino acid change in Drosophila esterase-6 associated with a change in physiological function. Genetica 110, 231–244 (2000). https://doi.org/10.1023/A:1012727814167

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