methionine cysteine glutathione Transsulfuration Activity Can Support Cell Growth upon Extracellular Limitation Frontiers | Cysteine Depletion, a

Frontiers Cysteine Depletion, a Key Action to Challenge Cancer Cells to Ferroptotic Cell Death Glutathione Depletion Pathways 1. Precursor Depletion Key bottleneck: Cysteine availability. Source: Diet or hepatic transsulfuration ( methionine homocysteine cysteine). Failure mode: Downregulation of cystathionine lyase (CSE) during Vitamin B12 is the essential cofactor that lets the Folate Cycle hand a methyl group to homocysteine (via methionine synthase), enabling methionine SAMe production; SAMe is the cell's universal methyl donor Cysteine, Glutathione, and Thiol Redox Balance in Astrocytes

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