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- W2094211188 abstract "35Cl nmr relaxation rate measurements have been used to study anion-binding sites in pig heart lactate dehydrogenase. These studies reveal two types of sites, one is intimately associated with the active site, the other is not. The nonactive site has been ascribed to a subunit site in analogy with crystallographic results from the dogfish M4 enzyme. The binding of either the reduced or the oxidized form of NAD results in an increase in the 35Cl nmr relaxation rate by a factor of 1.8–2. The enhanced nmr relaxation rate of the binary lactate dehydrogenase-NAD complex is reduced on binding of the substrate inhibitor molecules oxamate or oxalate to a value less than that exhibited by lactate dehydrogenase alone. The enhancement of the nmr relaxation rate is attributed to a decrease in the dissociation constant of Cl for the enzyme. The Kp values for Cl binding to the active center site of lactate dehydrogenase is 0.85 m and for lactate dehydrogenase-NADH is 0.25 m. The ratio of these constants, 3.4, agrees well with the measured enhancement value 3.7. The effect of coenzyme analogs on the 35Cl nmr relaxation rate has been examined. 3-Acetylpyridine NAD produces an enhancement of 4.3, thionicotinamide NAD of 2.3, whereas 3-pyridinealdehyde, adenosinediphosphoribose, and adenosine diphosphate do not affect the nmr relaxation state of Cl bound to lactate dehydrogenase." @default.
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- W2094211188 date "1975-07-01" @default.
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- W2094211188 title "35Cl nuclear magnetic resonance studies of anion-binding sites in proteins: Lactate dehydrogenase" @default.
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- W2094211188 doi "https://doi.org/10.1016/0003-9861(75)90312-4" @default.
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