Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 287, Issue 30, Pages 25589-25595Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M112.368936
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Funding
- Intramural Research Program of the National Institutes of Health through the NHLBI
- fellowship from the Fund for Scientific Research, Flanders
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Methionine sulfoxide reductase A is an essential enzyme in the antioxidant system which scavenges reactive oxygen species through cyclic oxidation and reduction of methionine and methionine sulfoxide. The cytosolic form of the enzyme is myristoylated, but it is not known to translocate to membranes, and the function of myristoylation is not established. We compared the biochemical and biophysical properties of myristoylated and nonmyristoylated mouse methionine sulfoxide reductase A. These were almost identical for both forms of the enzyme, except that the myristoylated form reduced methionine sulfoxide in protein much faster than the nonmyristoylated form. We determined the solution structure of the myristoylated protein and found that the myristoyl group lies in a relatively surface exposed myristoyl nest. We propose that this structure functions to enhance protein-protein interaction.
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