Characterization and solution structure of mouse myristoylated methionine sulfoxide reductase A.
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.
Laboratory of Biochemistry, NHLBI, National Institutes of Health, Bethesda, Maryland 20892-8012, USA.
Jung Chae
JC
Lim
James M
JM
Gruschus
Bart
B
Ghesquière
Geumsoo
G
Kim
Grzegorz
G
Piszczek
Nico
N
Tjandra
Rodney L
RL
Levine
D000818:Animals; D054878:Lipoylation / Q000502:physiology*; D008715:Methionine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D051150:Methionine Sulfoxide Reductases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D017434:Protein Structure, Tertiary
D008715:Methionine; D051150:Methionine Sulfoxide Reductases; C027219:methionine sulfoxide reductase; C013111:methionine sulfoxide