MetaCyc Enzyme: desoxyhemigossypol-6-O-methyltransferase

Gene: dHG-6-OMT Accession Number: G-10459 (MetaCyc)

Species: Gossypium barbadense

Subunit composition of desoxyhemigossypol-6-O-methyltransferase = [DHG-6-OMT]2
         desoxyhemigossypol-6-O-methyltransferase = DHG-6-OMT

The cDNA has been cloned. The sequence was shown in [Liu02a], but not in GenBank.

Molecular Weight of Polypeptide: 41.2 kD (experimental) [Liu99b ]

Molecular Weight of Multimer: 81.4 kD (experimental) [Liu99b]

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Created 15-Jan-2008 by Zhang P , TAIR

Enzymatic reaction of: desoxyhemigossypol-6-O-methyltransferase

EC Number: 2.1.1.-

desoxyhemigossypol + S-adenosyl-L-methionine <=> desoxyhemigossypol-6-methyl ether + S-adenosyl-L-homocysteine + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction in which it was curated.

The reaction is physiologically favored in the direction shown.

In Pathways: gossypol biosynthesis

The enzyme activity does not require metal ions. Addition of EDTA had no effects. The enzyme was strongly inhibited by the addition of 10mM p-chloromercuribenzoate (98% reduction), 10 mM iodoacetamide (63%), 5 mM heavy metal cobalt (96%), copper (98%), manganese (82%), and zinc (98%). The enzyme specifically methylates the 6-position of desoxyhemigossypol. Hemigossypol, 2,7-dihydroxycadalene, caffeic acid, 4-methylcatechol, or 2,3-dihydroxynaphthalene was not mehtylated.

Inhibitors (Unknown Mechanism): p-chloromercuribenzoate [Liu99b] , iodoacetamide [Liu99b] , Co2+ [Liu99b] , Cu2+ [Liu99b] , Mn2+ [Liu99b] , Zn2+ [Liu99b]

Kinetic Parameters:

Km (μM)


Liu02a: Liu J, Benedict CR, Stipanovic RD, Magill CW, Bell AA (2002). "Cloning and expression of desoxyhemigossypol-6-O-methyltransferase from cotton (Gossypium barbadense)." J Agric Food Chem 50(11);3165-72. PMID: 12009981

Liu99b: Liu J, Benedict CR, Stipanovic RD, Bell AA (1999). "Purification and Characterization of S-Adenosyl-L-Methionine: Desoxyhemigossypol-6-O-Methyltransferase from Cotton Plants. An Enzyme Capable of Methylating the Defense Terpenoids of Cotton." Plant Physiol 121(3);1017-1024. PMID: 10557251

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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