The enzymic synthesis of ribose-1,5-bisphosphate: studies of its role in metabolism.

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Authored By
Guha SK, Rose ZB
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Surgery
Speciality
Surgery
Book Detail
volume
250
ISSN
0003-9861
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ISSN
9781911510772
IS_Ebsco
true
Additional Info
["Guha SK, Rose ZB","Animals, Brain metabolism, Enzyme Activation, In Vitro Techniques, Mice, Phosphofructokinase-1 metabolism, Phosphotransferases metabolism, Substrate Specificity, Pentosephosphates biosynthesis","English","1986-11-01","Archives of biochemistry and biophysics","250"]
Description
Ribose-1,5-bisphosphate is synthesized in a reaction that uses ribose-1(or 5)-P as the phosphoryl acceptor and the acyl-P of 3-phosphoglyceryl phosphate as the donor. Glucose-1,6-bisphosphate is synthesized in a similar reaction. The relative activity with the two substrates remains unchanged over almost 300-fold purification of the enzyme, indicating that glucose-1,6-bisphosphate synthase catalyzes both reactions. The relative V/Km values for alternative phosphoryl acceptors are ribose-1-P (1); glucose-1-P (0.30); mannose-1-P and ribose-5-P (0.11); glucose-6-P (0.10); 2-deoxyglucose-6-P (0.03); and 2-deoxyribose-5-P (0.02). Fructose-1- and 6-phosphates are not substrates. The synthesis of both ribose-1,5-bisphosphate and glucose-1,6-bisphosphate is inhibited by physiologically significant levels of fructose-1,6-bisphosphate, glycerate-2,3-bisphosphate, glycerate-3-phosphate, citrate, and inorganic phosphate. Ribose-1,5-bisphosphate is a strong activator of brain phosphofructokinase.
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