Abstract
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1.
Citrate lyase (EC 4.1.3.6) from Rhodopseudomonas gelatinosa has been purified to homogeneity by protamine sulfate fractionation, chromatography on DEAE-Cellulose and gel filtration. The final enzyme preparation had a specific activity of 138 units per mg of protein and was purified 43-fold over the crude extract. Analysis of citrate lyase by sedimentation equilibrium experiments and gel filtration gave molecular weights of 530000 and 560000, respectively.
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2.
Electron microscopic investigations of negatively stained enzyme molecules and image analysis showed that citrate lyase is composed of six large and six small subunits; they are arranged in two hexagonal rings lying face to face, each containing, in alternating sequence, three large and three small subunits. The enzyme molecule is 160 Å in diameter and about 100 Å thick.
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3.
Treatment with sodium dodecylsulfate and mercaptoethanol dissociated citrate lyase into three proteins. Protein III (small subunit) had a molecular weight of 30000 and contained the pantothenate; protein II (large subunit) had a molecular weight of 61000; protein I (M r =97000) was probably an aggregate of II and III.
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4.
Based on the results obtained a model of citrate lyase was constructed.
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5.
Purified citrate lyase was obtained from R. gelatinosa in a deacetylated and largely oxidized form. The enzyme was activated by reduction with dithiothreitol (3 mM) and subsequent acetylation with acetic anhydride (1.75 mM).
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6.
The enzyme was subject to reaction inactivation, the extent of which depended on the concentration of Mg2+.
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Beuscher, N., Mayer, F. & Gottschalk, G. Citrate lyase from Rhodopseudomonas gelatinosa: Purification, electron microscopy and subunit structure. Arch. Microbiol. 100, 307–328 (1974). https://doi.org/10.1007/BF00446325
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DOI: https://doi.org/10.1007/BF00446325