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2,4,7-trihydroxy-1,4-benzoxazin-3-one-glucoside 7-O-methyltransferase

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2,4,7-trihydroxy-1,4-benzoxazin-3-one-glucoside 7-O-methyltransferase
Identifiers
EC no.2.1.1.241
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
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NCBIproteins

2,4,7-trihydroxy-1,4-benzoxazin-3-one-glucoside 7-O-methyltransferase (EC 2.1.1.241, BX7 (gene), OMT BX7) is an enzyme with systematic name S-adenosyl-L-methionine:(2R)-4,7-dihydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-2-yl β-D-glucopyranoside 7-O-methyltransferase.[1] This enzyme catalyses the following chemical reaction

S-adenosyl-L-methionine + (2R)-4,7-dihydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-2-yl β-D-glucopyranoside S-adenosyl-L-homocysteine + (2R)-4-hydroxy-7-methoxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-2-yl β-D-glucopyranoside

The enzyme is involved in the biosynthesis of the protective and allelopathic benzoxazinoid DIMBOA, e.g. from the family Poaceae (grasses).

References

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  1. ^ Jonczyk R, Schmidt H, Osterrieder A, Fiesselmann A, Schullehner K, Haslbeck M, Sicker D, Hofmann D, Yalpani N, Simmons C, Frey M, Gierl A (March 2008). "Elucidation of the final reactions of DIMBOA-glucoside biosynthesis in maize: characterization of Bx6 and Bx7". Plant Physiology. 146 (3): 1053–63. doi:10.1104/pp.107.111237. PMC 2259038. PMID 18192444.
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