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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
β-Keto and β-hydroxyphosphonate analogs of biotin-5'-AMP are inhibitors of holocarboxylase synthetase.
Bioorganic & Medicinal Chemistry Letters 2014 December 16
Holocarboxylase synthetase (HLCS) catalyzes the covalent attachment of biotin to cytoplasmic and mitochondrial carboxylases, nuclear histones, and over a hundred human proteins. Nonhydrolyzable ketophosphonate (β-ketoP) and hydroxyphosphonate (β-hydroxyP) analogs of biotin-5'-AMP inhibit holocarboxylase synthetase (HLCS) with IC50 values of 39.7 μM and 203.7 μM. By comparison, an IC50 value of 7 μM was observed with the previously reported biotinol-5'-AMP. The Ki values, 3.4 μM and 17.3 μM, respectively, are consistent with the IC50 results, and close to the Ki obtained for biotinol-5'-AMP (7 μM). The β-ketoP and β-hydroxyP molecules are competitive inhibitors of HLCS while biotinol-5'-AMP inhibited HLCS by a mixed mechanism.
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