A comparative study of specificity of the intestinal Na+/sugar cotransport among vertebrates.
Kt values for various monosaccharides were determined from sugar-induced increments of the transmural potentials in isolated small intestines of the goldfish, bullfrog, turtle, quail, guinea pig, rat and rabbit, and specificity patterns of the Na+/sugar cotransporters were compared among these animal species. Absolute requirement of the D-pyranose ring structure was seen in all animals. Requirements of C2-OH and C6 were strong, but not absolute, and OH groups on C3, C4, C6 and the O-atom of the pyranose ring were also suggested to participate, in some degree, in the interaction with the carrier. Comparison of the disaccharide-evoked potentials revealed that there were considerable species differences in activities of trehalase, sucrase and lactase among animals examined, but the differences were relatively small for maltase activity.
Shimada
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Hoshi
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D000818:Animals; D003370:Coturnix; D006054:Goldfish; D006168:Guinea Pigs; D007700:Kinetics; D009004:Monosaccharide Transport Proteins / Q000378:metabolism*; D011817:Rabbits; D011892:Rana catesbeiana; D051381:Rats; D011919:Rats, Inbred Strains; D013045:Species Specificity; D013379:Substrate Specificity; D014426:Turtles
D009004:Monosaccharide Transport Proteins