Inhibition of Peptidylglycine α-Amidating Monooxygenase by Exploitation of Factors Affecting the Stability and Ease of Formation of Glycyl Radicals
作者:Brendon J. W. Barratt、Christopher J. Easton、David J. Henry、Iris H. W. Li、Leo Radom、Jamie S. Simpson
DOI:10.1021/ja046204n
日期:2004.10.1
Peptidylglycine alpha-amidating monooxygenase catalyzes the biosynthesis of peptide hormones through radical cleavage of the C-terminal glycine residues of the corresponding prohormones. We have correlated ab initio calculations of radical stabilization energies and studies of free radical brominations with the extent of catalysis displayed by peptidylglycine alpha-amidating monooxygenase, to identify
肽基甘氨酸 α-酰胺化单加氧酶通过自由基切割相应激素原的 C 端甘氨酸残基来催化肽激素的生物合成。我们将自由基稳定能的从头计算和自由基溴化的研究与肽基甘氨酸 α-酰胺化单加氧酶显示的催化程度相关联,以确定酶抑制剂的类别。特别是我们发现,在密切相关的系统中,用甘氨酸取代乙醇酸使计算的自由基稳定能降低了 34.7 kJ mol(-1),在四氯化碳中回流时用 N-溴代琥珀酰亚胺的溴化速率降低了一个因子至少 2000,并停止单加氧酶的催化作用,同时保持与酶的结合。