Inositol 1-methyltransferase

In enzymology, an inositol 1-methyltransferase (EC 2.1.1.40) is an enzyme that catalyzes the chemical reaction

S-adenosyl-L-methionine + myo-inositol S-adenosyl-L-homocysteine + 1D-1-O-methyl-myo-inositol

Thus, the two substrates of this enzyme are S-adenosyl methionine and myo-inositol, whereas its two products are S-adenosylhomocysteine and 1D-1-O-methyl-myo-inositol.

This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:1D-myo-inositol 1-O-methyltransferase. Other names in common use include inositol D-1-methyltransferase, S-adenosylmethionine:myo-inositol 3-methyltransferase, myo-inositol 3-O-methyltransferase, inositol 3-O-methyltransferase (name based on 1L-numbering system, and not 1D-numbering), and S-adenosyl-L-methionine:myo-inositol 3-O-methyltransferase. This enzyme participates in inositol phosphate metabolism.

References

• Wagner I, Hofmann H, Hoffmann-Ostenhof O (1969). "[Biosynthesis of cyclitols. 23. A soluble enzyme from pea seedlings methylating myo-inositol to D-bornesitol]". Hoppe. Seylers. Z. Physiol. Chem. 350 (11): 1460–4. PMID 5362620.