<p>This group of proteins represent a specific type of stand-alone uroporphyrin-III C-methyltransferases (SUMT) involved in sirohaem biosynthesis and typified by yeast Met1p [<cite idref="PUB00016134"/>, <cite idref="PUB00014702"/>].</p> Uroporphyrin-III C-methyltransferase, yeast