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Purification and characterisation of an inducible β-galactosidase from Corynebacterium murisepticum

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Abstract

The β-galactosidase (EC 3.2.1.32) of Corynebacterium murisepticum (inducible by lactose and galactose) was purified by successive column chromatography on Sephadex G-200, DEAE-Sephadex A-50 and DEAE-cellulose (DE52). The enzyme was found to be a dimer of identical subunits of molecular mass 100,000 daltons. The K m values of the enzyme for the substrates lactose and o-nitrophenyl-β-d-galactopyranoside (ONPG) are 16.7 mM and 4.4 mM, respectively, indicating, its low affinity for the substrates. The Ouchterlony immunodiffusion method exhibited immunological homogeneity of the enzyme preparation. The catalytic site of the enzyme does not take part in antigen-antibody reaction.

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Correspondence to Mangala Priyolkar.

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Priyolkar, M., Nair, C.K.K. & Pradhan, D.S. Purification and characterisation of an inducible β-galactosidase from Corynebacterium murisepticum . Arch. Microbiol. 151, 49–53 (1988). https://doi.org/10.1007/BF00444668

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Key words

  • β-galactosidase
  • Corynebacterium murisepticum
  • O-nitrophenyl-β-d-galactopyranoside
  • Immunological cross reactivity