Some Properties of a Macromolecular Conjugate of Lysozyme Prepared by Modification with a Monomethoxypolyethylene Glycol Derivative
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概要
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Hen egg-white lysozyme was modified with a succinyl ester derivative of monomethoxypolyethylene glycol (mPEG-COONSu), and some properties of the resulting conjugate (mPEG-lysozyme) were studied. The conjugate was prepared by modification of lysozyme with mPEG-COONSu and purified with use of columns of CM-Toyopearl 650M and Sephadex G-75. Analytical data indicated that in the conjugate, 1.05 moles of mPEG with an average molecular weight of 5,000 were covalently attached to the lysozyme molecule. Tryptic peptide analysis of the conjugate showed that Lys 33 in lysozyme is the residue mainly modified with mPEG-COONSu. Covalent attachment of the mPEG-derivative to amino groups greatly increased the thermostability of lysozyme without any conformational change of the protein molecule. mPEG-lysozyme retained full enzyme activity for glycol chitin, but lytic activity for Micrococcus luteus cells in neutral media was 75% of that of native lysozyme and its optimal pH was at pH 5.0. It was also found that the reactivity of lysozyme with anti-lysozyme antibody from BALB/c mice or human lymphocytes was decreased by modification with mPEG-COONSu. From these findings, it was suggested that mPEG-COONSu can be advantageously used for protein tailoring of lysozyme.
- 社団法人日本農芸化学会の論文
- 2000-04-23
著者
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Yamasaki Nobuyuki
Laboratory Of Biochemistry And Laboratory Of Protein Chemistry And Engineering Faculty Of Agricultur
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Nodake Yuichi
Laboratory Of Biochemistry Department Of Pharmacy Faculty Of Pharmaceutical Sciences Nagasaki Intern
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Nodake Y
Graduate School Of Kyushu Univ. Fukuoka Jpn
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Yamasaki Nobuyuki
Laboratory Of Biochemistry Division Of Bioresource And Bioenvironmental Sciences Graduate School Of
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Yamasaki Nobuyuki
Laboratory Of Agricultural Process Engineering Faculty Of Agriculture Kyushu University
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