NDLI: The Effects of pH on the Labellar Sugar Receptor of the Fleshfly

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The Effects of pH on the Labellar Sugar Receptor of the Fleshfly

Content Provider	Scilit
Author	Shiraishi, Akio Morita, Hiromichi
Copyright Year	1969
Description	Reproducible results describing the effects of pH on the response of the labellar sugar receptor of the fleshfly, Boettcherisca peregrina, were obtained. The response to sucrose was independent over a wide range of pH (3.0 to 10.0 for sucrose stimulation), but was inhibited fairly sharply on both sides of this range. Similar results were obtained for monosaccharide stimulation. The receptor was excited on stimulation by water above pH 12.0. The effects of high pH, both inhibitory and excitatory, were affected by the presence of salts. In the presence of 0.5 molar NaCl, for example, the pH-inhibition curve was shifted toward lower pH's by about one pH unit. The effects of low pH, on the other hand, were not affected by salts. Following Dixon's theory, it was concluded that at least five ionizable groups (loosing positive charges above pH 10.5) were located at the receptor site.
Related Links	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2202870/pdf http://jgp.rupress.org/content/53/4/450.full.pdf
Ending Page	470
Page Count	21
Starting Page	450
DOI	10.1085/jgp.53.4.450
Journal	The Journal of general physiology
Issue Number	4
Volume Number	53
Language	English
Publisher	Rockefeller University Press
Publisher Date	1969-04-01
Access Restriction	Open
Subject Keyword	Salts Stimulation Labellar Sucrose Fleshfly Sugar Dixon's Shifted Journal: The Journal of general physiology (Vol- 53, Issue- 4)
Content Type	Text

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