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Multi-site binding of epigallocatechin gallate to human serum albumin measured by NMR and isothermal titration calorimetry.
Bioscience Reports 2017 June 31
The affinity of epigallocatechin gallate (EGCG) for human serum albumin (HSA) was measured in physiological conditions using NMR and isothermal titration calorimetry (ITC). NMR estimated the K a (self-dissociation constant) of EGCG as 50 mM. NMR showed two binding events: strong ( n 1 =1.8 ± 0.2; K d1 =19 ± 12 μM) and weak ( n 2 ∼20; K d2 =40 ± 20 mM). ITC also showed two binding events: strong ( n 1 =2.5 ± 0.03; K d1 =21.6 ± 4.0 μM) and weak ( n 2 =9 ± 1; K d2 =22 ± 4 mM). The two techniques are consistent, with an unexpectedly high number of bound EGCG. The strong binding is consistent with binding in the two Sudlow pockets. These results imply that almost all EGCG is transported in the blood bound to albumin and explains the wide tissue distribution and chemical stability of EGCG in vivo .
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