Abstract
The binding of NAD+ and NADH to bovine liver UDP-glucose dehydrogenase was studied by using gel-filtration and fluorescence-titration methods. The enzyme bound 0.5mol of NAD+ and 2 mol of NADH/mol of subunit at saturating concentrations of both substrate and product. The dissociation constant for NADH was 4.3μm. The binding of NAD+ to the enzyme resulted in a small quench of protein fluorescence whereas the binding of NADH resulted in a much larger (60–70%) quench of protein fluorescence. The binding of NADH to the enzyme was pH-dependent. At pH8.1 a biphasic profile was obtained on titrating the enzyme with NADH, whereas at pH8.8 the titration profile was hyperbolic. UDP-xylose, and to a lesser extent UDP-glucuronic acid, lowered the apparent affinity of the enzyme for NADH.
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