High control coefficient of transketolase in the nonoxidative pentose phosphate pathway of human erythrocytes: NMR, antibody, and computer simulation studies
The degree of control exerted by transketolase over metabolite flux in the nonoxidative pentose phosphate pathway in human erythrocytes was investigated using transketolase antiserum to modulate the activity of that enzyme. 31P NMR enabled the simultaneous measurement of the levels of pentose phosph...
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Published in | Biochemistry (Easton) Vol. 31; no. 51; pp. 12792 - 12798 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
29.12.1992
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Abstract | The degree of control exerted by transketolase over metabolite flux in the nonoxidative pentose phosphate pathway in human erythrocytes was investigated using transketolase antiserum to modulate the activity of that enzyme. 31P NMR enabled the simultaneous measurement of the levels of pentose phosphate pathway metabolites following incubation of hemolysates with ribose 5-phosphate. The variations in metabolic flux which occurred as the transketolase activity of hemolysate samples was altered indicated that a high degree of control was exerted by transketolase. Investigations using transaldolase-depleted hemolysates showed that transaldolase exhibits a lesser degree of control over pathway flux. Experimental data were compared with simulations generated by a computer model encompassing the reactions of the classical nonoxidative pentose phosphate pathway. The sensitivity coefficients (also called "control strengths" or "flux-control coefficients") calculated from the computer simulations were 0.74 and 0.03 for transketolase and transaldolase, respectively. |
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AbstractList | The degree of control exerted by transketolase over metabolite flux in the nonoxidative pentose phosphate pathway in human erythrocytes was investigated using transketolase antiserum to modulate the activity of that enzyme. super(31)P NMR enabled the simultaneous measurement of the levels of pentose phosphate pathway metabolites following incubation of hemolysates with ribose 5-phosphate. The variations in metabolic flux which occurred as the transketolase activity of hemolysate samples was altered indicated that a high degree of control was exerted by transketolase. Investigations using transaldolase-depleted hemolysates showed that transaldolase exhibits a lesser degree of control over pathway flux. Experimental data were compared with simulations generated by a computer model encompassing the reactions of the classical nonoxidative pentose phosphate pathway. The sensitivity coefficients (also called "control strengths" or "flux-control coefficients") calculated from the computer simulations were 0.74 and 0.03 for transketolase and transaldolase, respectively. The degree of control exerted by transketolase over metabolite flux in the nonoxidative pentose phosphate pathway in human erythrocytes was investigated using transketolase antiserum to modulate the activity of that enzyme. 31P NMR enabled the simultaneous measurement of the levels of pentose phosphate pathway metabolites following incubation of hemolysates with ribose 5-phosphate. The variations in metabolic flux which occurred as the transketolase activity of hemolysate samples was altered indicated that a high degree of control was exerted by transketolase. Investigations using transaldolase-depleted hemolysates showed that transaldolase exhibits a lesser degree of control over pathway flux. Experimental data were compared with simulations generated by a computer model encompassing the reactions of the classical nonoxidative pentose phosphate pathway. The sensitivity coefficients (also called "control strengths" or "flux-control coefficients") calculated from the computer simulations were 0.74 and 0.03 for transketolase and transaldolase, respectively. |
Author | Berthon, Hilary A Nixon, Peter F Kuchel, Philip W |
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SubjectTerms | Biological and medical sciences Blotting, Western Cell metabolism, cell oxidation Cell physiology Computer Simulation erythrocytes Erythrocytes - enzymology Fundamental and applied biological sciences. Psychology Humans Immune Sera Kinetics Luminescent Measurements Magnetic Resonance Spectroscopy man mathematical models Molecular and cellular biology N.M.R Pentose Phosphate Pathway Pentosephosphates - blood Ribosemonophosphates - blood Ribulosephosphates - blood transketolase Transketolase - blood Transketolase - immunology |
Title | High control coefficient of transketolase in the nonoxidative pentose phosphate pathway of human erythrocytes: NMR, antibody, and computer simulation studies |
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