Inositol pentaphosphate in fish red blood cells

• Published in: Journal of Experimental Zoology
• Main Authors: Borgese, Thomas A., Nagel, Ronald L.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1978
• Subjects: spiny dogfish; Squalus acanthias
• Online Access: http://dx.doi.org/10.1002/jez.1402050116; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjez.1402050116; https://onlinelibrary.wiley.com/doi/pdf/10.1002/jez.1402050116

Abstract Inositol pentaphosphate (IP5) has long been characteristic of avian erythrocytes. We now report that this compound is also present in the red cells of two species of elasmobranch fishes, Squalus acanthias (spiny dogfish) and Narcacion nobiliana (torpedo ray). The mean concentration of IP5 is 0.36 and 0.24 micromoles per ml of red cells respectively. ATP is the major organic phosphate in both fishes. 2,3‐diphosphoglycerate is absent and GTP levels correspond approximately to the levels of IP5.