methionine cycle/metabolic pathway methionine degradation pathway 2013-05-14T13:56:22Z PW:0001302 Those metabolic reactions involved in the degradation of methionine. In higher organisms methionine is either recycled via the remethylation pathways or is converted to cysteine via the transsulfuration pathway of homocysteine metabolism. In fungi, plants and bacteria, methionine can be processed to compounds such as methionol and/or 2-oxobutanoate. methionine catabolic process pathway vpetri