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Members of this family belong to the type I and are: [6] in the transsulfurylation route for methionine biosynthesis: Cystathionine -synthase ( metB ) which joins an activated homoserine ester (acetyl or succinyl) with cysteine to form cystathionine Cystathionine -lyase ( metC ) which splits cystathionine into homocysteine and a deaminated alanine (pyruvate and ammonia) in the direct sulfurylation pathway for methionine biosynthesis: O-acetyl homoserine sulfhydrylase ( metY ) which adds a thiol group to an activated homoserine ester O-succinylhomoserine sulfhydrylase ( metZ ) which adds a thiol group to an activated homoserine ester in the reverse transsulfurylation pathway for cysteine biosynthesis: Cystathionine -lyase (no common gene name) which joins an activated serine ester (acetyl or succinyl) with homocysteine to form cystathionine Not Cystathionine -synthase which is a PLP enzyme type II cysteine biosynthesis from serine: O-acetyl serine sulfhydrylase ( cysK or cysM ) which adds a thiol group to an activated serine ester methionine degradation: Methionine gamma-lyase ( mdeA ) which breaks down methionine at the thioether and amine bounds Note: MetC, metB, metZ are closely related and have fuzzy boundaries so fall under the same NCBI orthologue cluster (COG0626)
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Iron deficiency anemia (low levels of red blood cells) can cause extreme fatigue and weakness
