K+-dependent phenylalanine uptake in membrane vesicels isolated from the midgut of Philosamia cynthia larvae.
Membrane vesicles prepared from the midguts of Philosamia cynthia larvae (Lepidoptera) show a concentrative uptake of phenylalanine in the presence of salt gradients. Unlike mammalian intestines, the highest accumulation of the amino acid occurs with a potassium salt gradient. Glucose is very poorly permeable across the vesicles.
D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D004064:Digestive System / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D007408:Intestinal Absorption / Q000187:drug effects*; D007814:Larva / Q000378:metabolism; D007915:Lepidoptera / Q000378:metabolism*; D010649:Phenylalanine / Q000378:metabolism*; D011188:Potassium / Q000494:pharmacology*
D010649:Phenylalanine; D005947:Glucose; D011188:Potassium