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• W1611362805 abstract "Following shocks with low voltage electric current, earthworms, Lumbricus terrestris, secrete a yellow mucus that has alarm properties for conspecifics and chemoattractive properties for garter snakes, Thamnophis sirtalis. A proteinaceous chemoattractant for garter snakes has been isolated and purified to homogeneity from such secretions by means of permeation chromatography and semipreparative nondenaturing polyacrylamide gel electrophoresis. The purified protein is highly attractive to garter snakes; it loses its activity after proteolytic digestion. It is a glycoprotein consisting of a single polypeptide chain with an NH2-terminal alanine. This chemoattractant has a minimum molecular mass of 15.4 kDa calculated from its amino acid and carbohydrate contents and an apparent molecular mass of about 20 kDa as estimated from sodium dodecyl sulfate-polyacrylamide gel electrophoresis. It has a pI of about 4.0, and it binds wheat germ agglutinin but not concanavalin A. This chemoattractant shows a protein to carbohydrate ratio of 2.0 +/- 0.08 (n = 5) and a ratio of total sugar to amino sugar of 1.9 +/- 0.08 (n = 3). The sequence of its NH2-terminal 15 amino acid residues has been determined. Studies were also conducted on the chemosignal transduction through the vomeronasal sensory system of the garter snake. Dot blot analysis showed that the purified chemoattractant bound to snake vomeronasal sensory epithelial membrane fractions. It did not bind to membrane extracts of the nonsensory epithelium of the vomeronasal mushroom body. The chemoattractant also bound specifically to vomeronasal sensory epithelial membrane in a reversible and saturable fashion with Kd and Bmax values of about 0.3 microM and 0.4 nmol/mg of protein, respectively. In electrophysiological studies, the chemoattractant applied to the vomeronasal epithelium caused an increase in firing rate of individual neurons in the accessory olfactory bulb of garter snakes, the projection site for vomeronasal neurons. The present results are the first clear biochemical and electrophysiological evidence for a vomeronasal epithelium response to a purified nonvolatile odorant, and this makes the garter snake vomeronasal system ideal for studying the mechanisms of chemosignal transduction." @default.
• W1611362805 created "2016-06-24" @default.
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• W1611362805 date "1990-05-01" @default.
• W1611362805 modified "2023-09-28" @default.
• W1611362805 title "Purification and characterization of a chemoattractant from electric shock-induced earthworm secretion, its receptor binding, and signal transduction through the vomeronasal system of garter snakes." @default.
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• W1611362805 doi "https://doi.org/10.1016/s0021-9258(19)38950-1" @default.
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