Abstract
Malate synthase, one of the key enzymes in the glyoxylate cycle, was purified from peroxisomes of alkane-grown yeast, Candida tropicalis. The enzyme was mainly localized in the matrix of peroxisomes, judging from subcellular fractionation followed by exposure of the organelles to hypotonic conditions. The molecular mass of this peroxisomal malate synthase was determined to be 250,000 daltons by gel filtration on a Sepharose 6B column as well as by ultracentrifugation. On sodium dodecylsulfate/polyacrylamide slab-gel electrophoresis, the molecular mass of the subunit of the enzyme was demonstrated to be 61,000 daltons. These results revealed that the native form of this enzyme was homo-tetrameric. Peroxisomal malate synthase showed the optimal activity pH at 8.0 and absolutely required Mg2+ for enzymatic activity. The K m values for Mg2+, acetyl-CoA and glyoxylate were 4.7 mM, 80 μM and 1.0 mM, respectively.
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Okada, H., Ueda, M. & Tanaka, A. Purification of peroxisomal malate synthase from alkane-grown Candida tropicalis and some properties of the purified enzyme. Arch. Microbiol. 144, 137–141 (1986). https://doi.org/10.1007/BF00414723
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DOI: https://doi.org/10.1007/BF00414723