Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'O-acetylhomoserine aminocarboxypropyltransferase activity'?

A. Catalysis of the reaction: N1-methylpseudouridine in 18S rRNA + S-adenosyl-L-methionine = H+ + N1-methyl-N3-[(3S)-3-amino-3-carboxypropyl]pseudouridine in 18S rRNA + S-methyl-5'-thioadenosine.
B. Catalysis of the reaction: 2 dimethylallyl diphosphate = diphosphate + lavandulyl diphosphate.
C. Catalysis of the reaction: O-acetyl-L-homoserine + methanethiol = L-methionine + acetate. Also reacts with other thiols and H2S, producing homocysteine or thioethers.
D. Catalysis of the reaction: N(6)-dimethylallyladenine + S-adenosyl-L-methionine(1+) = S-methyl-5'-thioadenosine + discadenine + H+.

Answer: Catalysis of the reaction: O-acetyl-L-homoserine + methanethiol = L-methionine + acetate. Also reacts with other thiols and H2S, producing homocysteine or thioethers.