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The pyrromethane cofactor of hydroxymethylbilane synthase (porphobilinogen deaminase) from Escherichia coli is bound to the protein through the sulphur atom of a cysteine residue [Hart, Miller &amp; Battersby (1988) Biochem. J. 252, 909-912; Beifuss, Hart, Miller &amp; Battersby (1988) Tetrahedron Lett. 29, 2591-2594]. We show that the pyrromethane-binding residue is cysteine-242.

biochemical journal

Evidence that the pyrromethane cofactor of hydroxymethylbilane synthase (porphobilinogen deaminase) is bound to the protein through the sulphur atom of cysteine-242