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Transsulfuration pathways in the filamentous fungi A. nidulans and N. crassa. OAH, O-acetyl-homoserine; OAS, O-acetyl-serine; SAM, S-adenosyl-methionine; SAH, S-adenosyl-homocysteine. Enzymes: 1, CBS; 2, cystathionine γ-lyase; 3, cystathionine γ-synthase; 4, cystathionine β-lyase; 5, homocysteine synthase; 6, CYS; 7, methionine synthase.
