Enables the transfer of citrate, 2-hydroxy-1,2,3-propanetricarboyxlate, from one side of a membrane to the other.

Enables the transfer of tricarboxylic acids from one side of a membrane to the other. Tricarboxylic acid are organic acids with three COOH groups.

Catalysis of the reaction: S-adenosyl-L-methionine(1+) + demethylmacrocin = S-adenosyl-L-homocysteine + H(+) + macrocin.

Enables the transfer of fumarate from one side of a membrane to the other. Fumarate is a key intermediate in metabolism and is formed in the TCA cycle from succinate and converted into malate.

Catalysis of the reaction: N-benzoyl-4-hydroxyanthranilate + S-adenosyl-L-methionine(1+) = N-benzoyl-4-methoxyanthranilate + S-adenosyl-L-homocysteine + H(+).

Enables the transfer of glucuronate from one side of a membrane to the other. Glucuronate is the uronic acid formally derived from glucose by oxidation of the hydroxymethylene group at C-6 to a carboxyl group.

Catalysis of the reaction: S-adenosyl-L-methionine(1+) + L-tryptophan = S-adenosyl-L-homocysteine + L-2-methyltryptophan + H(+).

Catalysis of the reaction: 6-hydroxymellein + S-adenosyl-L-methionine = 6-methoxymellein + S-adenosyl-L-homocysteine + H(+).

Enables the transfer of uronic acid from one side of a membrane to the other. Uronic acids are any monocarboxylic acid formally derived by oxidizing to a carboxyl group the terminal hydroxymethylene group of either an aldose with four or more carbon atoms in the molecule, or of any glycoside derived from such an aldose.

Enables the transfer of hexuronates from one side of a membrane to the other. A hexuronate is any monocarboxylic acid derived from a hexose by oxidation of C-6.

Enables the transfer of prostaglandins from one side of a membrane to the other. A prostaglandin is any of a group of biologically active metabolites which contain a cyclopentane ring due to the formation of a bond between two carbons of a fatty acid. They have a wide range of biological activities.

Enables the transfer of icosanoids from one side of a membrane to the other.

Enables the transfer of mevalonate from one side of a membrane to the other. Mevalonate is the anion of mevalonic acid; its (R)-enantiomer is a strategic intermediate derived from hydroxymethylglutaryl-CoA in the biosynthesis of polyprenyl compounds.

Catalysis of the reaction: S-adenosyl-L-methionine + anthranilate = N-methylanthranilate + S-adenosyl-L-homocysteine + H(+).

Catalysis of the reaction: S-adenosyl-L-methionine + glucuronoxylan D-glucuronate = S-adenosyl-L-homocysteine + glucuronoxylan 4-O-methyl-D-glucuronate.

Catalysis of the reaction: S-adenosyl-L-methionine + (RS)-1-benzyl-1,2,3,4-tetrahydroisoquinoline = S-adenosyl-L-homocysteine + N-methyl-(RS)-1-benzyl-1,2,3,4-tetrahydroisoquinoline.

Catalysis of the reaction: (S)-scoulerine + S-adenosyl-L-methionine(1+) = (S)-tetrahydrocolumbamine + S-adenosyl-L-homocysteine + H(+).

Catalysis of the reaction: S-adenosyl-L-methionine + columbamine = S-adenosyl-L-homocysteine + H(+) + palmatine.

Catalysis of the reaction: 10-hydroxydihydrosanguinarine + S-adenosyl-L-methionine(1+) = S-adenosyl-L-homocysteine + dihydrochelirubine + H(+).

Catalysis of the reaction: S-adenosyl-L-methionine(1+) + pyridine = N-methylpyridinium + S-adenosyl-L-homocysteine.