Abstract
5-Aminolevulinic acid dehydratase from the archaebacterium Methanosarcina barken resembles the mammalian and yeast enzymes in its activation by Zn 2+, whereas its activation by K + resembles the characteristic of bacterial enzymes. This enzyme is activated with Ni 2+ which is a component of F 430, a cofactor present mainly in methanogens. The M r of 280000 for the native enzyme and 30 000 ± 2000 for the individual subunit suggest that the enzyme is composed of eight apparently indentical subunits similar to mammalian and yeast enzymes. The enzyme has two pH optima, at 8.5 and 9.4. Higher levels of 5-aminolevulinic acid dehydratase in acetate-grown cells suggest the possibility that regulation and control of this enzyme could be different on various growth substrates.
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