PMID: 1144Oct 1, 1975

Properties of a free and a solubilized form of bound alpha,alpha-trehalase purified from honey bee thorax

Canadian Journal of Biochemistry
B G TalbotR E Huber

Abstract

The free and bound forms of alpha,alpha-trehalase (EC 3.2.1.28) of the honey bee thorax were separated and the bound enzyme was solubilized by raising the pH to 8.0 for 10 h. Both enzymes were purified. They were homogeneous as determined by several electrophoretic criteria. It was found that the two enzymes had very similar Km's (each about 0.89 mM), Vm's (53.2 and 54.3 U/mg for free and solubilized, respectively), inhibition characteristics, specificities (both only hydrolyzed alpha,alpha-trehalose), pH maxima (each had maxima at about 3.5 and 6.5), molecular weights (65,000), isoelectric points (5.1), reactivities to sulfhydryl reagents, electrophoretic mobilities, activation energies (about 12.8 kcal/mol), and similar stabilities to heat, pH, and urea. Some significant differences between the two enzymes were, however, found: the solubilized alpha,alpha-trehalase floated at 70% saturation of ammonium sulfate while the free alpha,alpha-trehalase did not; the solubilized alpha,alpha-trehalase did not dissociate into subunits as readily as did the free one; and the solubilized alpha,alpha-trehalase was found to bind more readily to a hydrophobic grouping than the free enzyme. In addition to these comparisons, three new finding...Continue Reading

Citations

Jul 1, 1993·Insect Biochemistry and Molecular Biology·A P Valaitis, D F Bowers
Feb 6, 2002·Bioscience, Biotechnology, and Biochemistry·J H LeeS Chiba
Jan 1, 1980·Biochimie·E Bar-GuillouxJ E Courtois

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