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• W2094674418 endingPage "4596" @default.
• W2094674418 startingPage "4588" @default.
• W2094674418 abstract "To obtain structural information on the active site of thiamin-dependent enzymes in solution, we have studied the interactions of Cu2+ ions with 2-(α-hydroxyethyl)thiamin pyrophosphate (HETPP), the pentapeptide Asp-Asp-Asn-Lys-Ile surrounding the thiamin pyrophosphate moiety in the transketolase enzyme, and the tertiary Cu2+−pentapeptide−HETPP system in aqueous solutions at various pH values. In the binary Cu2+−pentapeptide system around physiological pH, the bonding sites were the terminal NH2 group, the aspartate β-carboxylates, and a deprotonated peptide nitrogen, while, in the Cu2+−HETPP system at the same pH, the Cu(II) was coordinated to the pyrophosphate group and to the pyrimidine N(1‘) atom. It is found that, in the tertiary system at physiological pH, the peptide bone offers three coordination sites to the metal ion, and the coordination sphere is completed by two additional phosphate oxygens and the nitrogen N(1‘) of the thiamin coenzyme. The stability constants in the tertiary system are higher than those in the simpler Cu2+−HETPP and Cu2+−peptide systems. The present data show that the coenzyme adopts the so-called S conformation in solution. The importance of our findings concerning the N(1‘) coordination and the S conformation in the tertiary system is discussed in conjunction with the role of HETPP as an intermediate of thiamin catalysis." @default.
• W2094674418 created "2016-06-24" @default.
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• W2094674418 date "2001-08-03" @default.
• W2094674418 modified "2023-09-24" @default.
• W2094674418 title "Complexation of Cu²⁺ by HETPP and the Pentapeptide Asp-Asp-Asn-Lys-Ile: A Structural Model of the Active Site of Thiamin-Dependent Enzymes in Solution" @default.
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• W2094674418 doi "https://doi.org/10.1021/ic001465t" @default.
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