Journal
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEIN STRUCTURE AND MOLECULAR ENZYMOLOGY
Volume 1549, Issue 2, Pages 155-160Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-4838(01)00252-7
Keywords
fusion protein; channeling; beta-galactosidase; galactose dehydrogenase
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The mechanistic implications of the kinetic behaviour of a fusion protein of beta -galactosidase and galactose dehydrogenase have been analysed in view of predictions based on experimentally determined kinetic parameter values for the galactosidase and dehydrogenase activities of the protein. The results show that the time course of galactonolactone formation from lactose in the coupled reaction catalysed by the fusion protein can be most satisfactorily accounted for in terms of a free-diffusion mechanism when consideration is given to the mutarotation of the reaction intermediate galactose. It is concluded that no tenable kinetic evidence is available to support the proposal that the fusion protein catalyses galactonolactone formation from lactose by a mechanism involving channelling of galactose. (C) 2001 Published by Elsevier Science B.V.
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