Multiple receptor proteins for sweet taste in Drosophila discriminated by papain treatment

Teiichi Tanimura, Ichiro Shimada

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30 Citations (Scopus)


Treatment of the labellar chemosensory setae of the fruit fly, Drosophila melanogaster, with 0.1 % papain for 3 min induced a complete elimination of the taste nerve response to fructose (Fig. 1). Responses to other sugars examined were not affected (Table 1). Responses to 20 mM LiCl and 0.1 M NaCl also remained unchanged by the treatment. The experiment on the time-dependency of the papain treatment showed a clear difference in the proteasesensitivity between the response to fructose and to glucose and sucrose (Fig. 2). The treatment with 0.005% trypsin for 3 min produced the same results. The response to fructose which was eliminated with the papain treatment, was restored after 3 hrs. These findings reveal the presence of a specific receptor site for fructose and its protease-sensitive nature and suggest the involvement of multiple receptor proteins in the sugar receptor of Drosophila.

Original languageEnglish
Pages (from-to)265-269
Number of pages5
JournalJournal of Comparative Physiology □ A
Issue number2
Publication statusPublished - Jun 1 1981

All Science Journal Classification (ASJC) codes

  • Physiology
  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology
  • Behavioral Neuroscience


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