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  • Title: Purification, crystallization and characterization of N-acetylneuraminate lyase from Escherichia coli.
    Author: Aisaka K, Igarashi A, Yamaguchi K, Uwajima T.
    Journal: Biochem J; 1991 Jun 01; 276 ( Pt 2)(Pt 2):541-6. PubMed ID: 1646603.
    Abstract:
    N-Acetylneuraminate lyase produced by Escherichia coli was purified and crystallized from a genetically engineered strain (E. coli SF8/pNAL1). The enzyme showed apparent molecular masses of 105,000 Da on gel filtration and 35,000 Da on SDS/PAGE, suggesting that the enzyme is a trimer. The apparent optimum pH and temperature were found to be 6.5-7.0 and 80 degrees C respectively. The Km values for N-acetylneuraminate and N-glycollylneuraminate were 3.3 and 3.3 mM respectively. The enzyme was inhibited by reduction with NaBH4 in the presence of the substrate, indicating that the enzyme belongs to the Schiff-base-forming Class I aldolases. The enzyme was strongly inhibited by Cu2+ ions, p-chloromercuribenzoate and N-bromosuccinimide, and also inhibited competitively by the reaction product, pyruvate, and its structurally related compounds, dihydroxyacetone and DL-glyceraldehyde.
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