Presence of nonoxidative enzymes of the pentose phosphate shunt in Tetrahymena.
Tetrahymena pyriformis, strain HSM, do not have glucose-6-phosphate dehydrogenase or 6-phosphogluconate dehydrogenase, but contain transaldolase, transketolase, ribose 5-phosphate isomerase, ribulose-5-phosphate 3-epimerase, and ribokinase.  The nonoxidative enzymes of the pentose phosphate shunt function in metabolism as indicated by the incorporation of label from [1-14C]ribose into CO2 and glycogen and by the increase in total glycogen content of cultures supplemented with ribose.
D002238:Carbohydrate Epimerases / Q000378:metabolism; D002245:Carbon Dioxide / Q000096:biosynthesis; D005632:Fructose; D005947:Glucose; D006003:Glycogen / Q000096:biosynthesis; D010429:Pentoses / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism; D010770:Phosphotransferases / Q000378:metabolism; D012266:Ribose; D013769:Tetrahymena pyriformis / Q000201:enzymology*; D014153:Transaldolase / Q000378:metabolism; D014174:Transketolase / Q000378:metabolism
D010429:Pentoses; D010710:Phosphates; D002245:Carbon Dioxide; D005632:Fructose; D012266:Ribose; D006003:Glycogen; D014174:Transketolase; D014153:Transaldolase; D010770:Phosphotransferases; D002238:Carbohydrate Epimerases; D005947:Glucose