We prepared the lysozyme derivative in which the β-carboxyl group of Asp101 was modified with α-O-methyl N-glycylglucosaminide as an amide by means of the carbodi-imide reaction (α-MGG lysozyme). Since Asp101 residue is located at the edge of the active site cleft, a 1H-NMR study was carried out for this derivative in order to investigate the interaction between the introduced substituent and the active site cleft. It was confirmed that the α-MGG moiety sat in the active site cleft in α-MGG lysozyme from the reduction of line broadening of the NH-proton of Trp63 located in the active site cleft, the remarkable chemical shift change of the methyl group of the α-MGG moiety upon adding a trimer of N-acetyl-D-glucosamine [(NAG)3], and the NOE between the C6-proton resonance of Trp63 and the methyl resonance of the α-MGG moiety. Furthermore, α-MGG lysozyme had increased thermal stability compared with native lysozyme. Therefore, it was concluded that the α-MGG moiety covalently attached to Asp101 interacted with the active site cleft to increase the thermal stability of lysozyme.
|ジャーナル||Journal of Biochemistry|
|出版ステータス||出版済み - 1 1 1991|
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