Studies on the nature of thiamine pyrophosphate binding and dependency on divalent cations of transketolase from human erythrocytes |
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Authors: | E H Jung T Takeuchi K Nishino Y Itokawa |
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Institution: | Department of Hygiene, Faculty of Medicine, Kyoto University, Japan. |
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Abstract: | 1. The binding kinetics for 35S]thiamine pyrophosphate to transketolase and the dependency of transketolase on divalent cations for activity were investigated. 2. With Scatchard analysis, dissociation constant (Kd) and n value were calculated to be 0.2 x 10(-6) M and 0.66 respectively. 3. The activity of the reconstituted enzyme increased in the order of Co2+ less than Mn2+ less than Ca2+ less than Mg2+. The native transketolase contained Mg2+ in its molecular structure. |
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