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IUBMB CommentsOximes of C4 to C6 aldehydes can act as acceptors; the most active substrate is 2-methylbutyroaldoxime.
The expected taxonomic range for this enzyme is: Pseudomonas sp.
Synonyms
aldoxime methyltransferase, methyltransferase, aldoxime O-, S-adenosylmethionine:aldoxime O-methyltransferase,
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aldoxime methyltransferase
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methyltransferase, aldoxime O-
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S-adenosylmethionine:aldoxime O-methyltransferase
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S-adenosyl-L-methionine + 2-methylpropanal oxime = S-adenosyl-L-homocysteine + 2-methylpropanal O-methyloxime
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methyl group transfer
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S-adenosyl-L-methionine:2-methylpropanal-oxime O-methyltransferase
Oximes of C4 to C6 aldehydes can act as acceptors; the most active substrate is 2-methylbutyroaldoxime.
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2-methylbutyraldoxime + S-adenosyl-L-methionine
2-methylbutyraldoxime methyl ether + S-adenosyl-L-homocysteine
3-methylbutyraldoxime + S-adenosyl-L-methionine
3-methylbutyraldoxime methyl ether + S-adenosyl-L-homocysteine
isobutyraldoxime + S-adenosyl-L-methionine
isobutyraldoxime methyl ether + S-adenosyl-L-homocysteine
methacrylaldoxime + S-adenosyl-L-methionine
methacrylaldoxime methyl ether + S-adenosyl-L-homocysteine
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n-butyraldoxime + S-adenosyl-L-methionine
n-butyraldoxime methyl ether + S-adenosyl-L-homocysteine
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n-pentanaldoxime + S-adenosyl-L-methionine
n-pentanaldoxime methyl ether + S-adenosyl-L-homocysteine
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n-propionaldoxime + S-adenosyl-L-methionine
n-propionaldoxime methyl ether + S-adenosyl-L-homocysteine
additional information
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2-methylbutyraldoxime + S-adenosyl-L-methionine
2-methylbutyraldoxime methyl ether + S-adenosyl-L-homocysteine
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highest activity
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2-methylbutyraldoxime + S-adenosyl-L-methionine
2-methylbutyraldoxime methyl ether + S-adenosyl-L-homocysteine
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highest activity
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3-methylbutyraldoxime + S-adenosyl-L-methionine
3-methylbutyraldoxime methyl ether + S-adenosyl-L-homocysteine
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3-methylbutyraldoxime + S-adenosyl-L-methionine
3-methylbutyraldoxime methyl ether + S-adenosyl-L-homocysteine
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isobutyraldoxime + S-adenosyl-L-methionine
isobutyraldoxime methyl ether + S-adenosyl-L-homocysteine
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isobutyraldoxime + S-adenosyl-L-methionine
isobutyraldoxime methyl ether + S-adenosyl-L-homocysteine
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n-propionaldoxime + S-adenosyl-L-methionine
n-propionaldoxime methyl ether + S-adenosyl-L-homocysteine
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n-propionaldoxime + S-adenosyl-L-methionine
n-propionaldoxime methyl ether + S-adenosyl-L-homocysteine
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additional information
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no reaction with n-hexanaldoxime, benzaldoxime, 2-butoxime
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additional information
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no reaction with n-hexanaldoxime, benzaldoxime, 2-butoxime
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additional information
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Mg2+ has no significant effect
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Ag2+
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100% inhibition at 1 mM
Hg2+
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100% inhibition at 0.05 mM
iodoacetamide
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55% inhibition at 0.5 mM
N-ethylmaleimide
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56% inhibition at 0.05 mM
Phenylmercuriacetate
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95% inhibition at 0.025 mM
S-adenosyl-L-homocysteine
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competitive inhibition
additional information
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EDTA and Mg2+ are not inhibitory
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additional information
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requires thiol-protecting agents for activity
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0.14
2-Methylbutyraldoxime
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0.16
3-Methylbutyraldoxime
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0.24 - 0.27
Isobutyraldoxime
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1.11
Methacrylaldoxime
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0.67
n-Pentanaldoxime
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1.54
n-Propionaldoxime
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0.15
S-adenosyl-L-methionine
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0.027
S-adenosyl-L-homocysteine
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9 - 10.4
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less than 50% of maximal activity below pH 9.0, almost no activity above pH 10.4
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N.C.I.B. 11652
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brenda
N.C.I.B. 11652
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brenda
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37500
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2 * 37500, SDS-PAGE
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dimer
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2 * 37500, SDS-PAGE
dimer
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2 * 37500, SDS-PAGE
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rapid inactivation above
additional information
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temperature sensitive: 0-3°C are necessary during purification
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labile to O2, thiol-protecting agents are necessary
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485667
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-15°C, 100 mM potassium phosphate buffer, pH 7.5, 5 mM DTT, several months
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0°C, (NH4)2SO4-paste has a half life of 10 weeks
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Harper, D.B.; Kennedy, J.T.
Purification and properties of S-adenosylmethionine: aldoxime O-methyltransferase from Pseudomonas sp. N.C.I.B. 11652
Biochem. J.
226
147-153
1985
Pseudomonas sp., Pseudomonas sp. NCIB 11652
brenda
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