Abstract
3-Isopropylmalate dehydrogenase was purified (about 2000-fold) to homogeneity for the first time from an archaebacterium, Sulfolobus sp. strain 7. The enzyme showed an apparent molecular mass of about 110 kDa by gel filtration and a single 36-kDa polypeptide band on SDS-PAGE, suggesting tri- or tetrameric structure. The p I value was 6.9. The N-terminal amino acid sequence was similar to enzymes from other sources. The enzyme activity was greatly stimulated by the presence of Mn 2+, Cd 2+, Mg 2+, or Co 2+. In contrast to 3-isopropylmalate dehydrogenase from other sources, monovalent cations such as K 2+ and Na 2+ were neither essential for activity nor stability of the protein. The enzyme was extraordinarily thermostable.
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