Detection of myristoyl CoA:protein N-myristoyltransferase activity by ion-exchange chromatography |
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| Authors: | L A Paige D R Chafin J M Cassady R L Geahlen |
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| Institution: | Department of Medicinal Chemistry and Pharmacognosy, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, Indiana 47907. |
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| Abstract: | Several proteins of viral and cellular origins are myristoylated on an amino-terminal glycine residue during biosynthesis. The enzyme responsible for this modification, myristoyl CoA:protein N-myristoyltransferase (NMT), can be measured in cell-free systems by following the transfer of 3H]myristate from 3H]myristoyl CoA to a synthetic peptide substrate. We report here a procedure for the analysis of NMT activity using ion-exchange chromatography on CM-Sepharose to separate 3H]myristoyl peptide from radiolabeled reactants. This technique provides a convenient method for assaying multiple samples that is much more rapid and sensitive than procedures that rely on reversed-phase HPLC for the separation of reaction components. Characterization of this assay indicates that it is suitable for the kinetic analysis of NMT activity and for the rapid analysis of column fractions generated during the purification of NMT. |
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