Chemical Properties and Polymerizing Ability of the Lysozyme Monomer Isolated after Storage with Glucose
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概要
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To reveal the mechanism of reducing sugar-induced polymerization of proteins, monomeric lysozymes were isolated at various stages of storage from whole lysozyme (WL) being kept with glucose at 75% relative humidity and 50°C for up to 30 days, and their chemical properties were investigated and compared with the corresponding WL. The impairment of Lys, Arg, and Trp residues was observed in all the isolated monomeric lysozymes (IM) as well as in the WL. When the IM were stored for another 10 days without glucose, they polymerized and had an additional impairment of Arg and Lys but not Trp residues. All IM exhibited almost the same polymerization rate, but the sum of additional losses of Lys and Arg residues varied. The IM was also found to cross-link untreated lysozymes even in the absence of glucose. On basis of the results obtained hitherto, it is suggested that the glucose-induced polymerization of lysozymes proceeds through the following paths. At the first step, some bifunctional agents (BF), probably α-dicarbonyl compounds, generated from the reaction between ε-amino groups of lysine residues and glucose, attach to Arg, Lys, and Trp residues through one of their two functional sites. At the second step, some of those proteins with BF attached polymerize by binding of the other unoccupied functional site with the remaining Lys and Arg (not Trp) residues of the other protein molecules. The other of the proteins with BF attached polymerize through the combination between the other unoccupied functional sites themselves with no loss of amino acid residues.
- 社団法人 日本農芸化学会の論文
著者
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Cho Rae
Department Of Agricultural Chemistry The University Of Tokyo
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Kato Hiromichi
Department Of Agricultural Chemistry The University Of Tokyo
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OKITANI Akihiro
Department of Animal Products Science and Technology, Nippon Veterinary and Zootechnical College
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OKITANI Akihiro
Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo
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