N-linked glycosylation of a beetle (Apriona germari) cellulase Ag-EGase II is necessary for enzymatic activity

文献类型： 外文期刊

第一作者： Wei, YD

作者： Wei, YD;Lee, KS;Gui, ZZ;Yoon, HJ;Kim, I;Je, YH;Lee, SM;Zhang, GZ;Guo, XJ;Sohn, HD;Jin, BR

作者机构：

关键词： Apriona germari;Baculovirus;Beetle;Cellulase;Endoglucanase;Enzyme;Insect cells;Mutation;N-linked glycosylation

期刊名称：INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY （ 影响因子：4.714； 五年影响因子：4.953 ）

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收录情况： SCI

摘要： We previously reported that the beta-l ,4-endoglucanase(EGase)belonging to glycoside hydrolase family(GHF)45 of the mulberry longicorn beetle,Apriona germari(Ag-EGase II),has three potential N-linked glycosylation sites;these sites are located at amino acid residues 56-59(NKSG),99-102(NSTF),and 237-239(NYSstop).In the present study,we analyze the functional role of these potential N-linked glycosylation sites.Tunicamycin treatment completely abolished the enzymatic activity of Ag-EGase II.To further elucidate the functional role of the N-linked glycosylation sites in Ag-EGase II,we have assayed the cellulase enzyme activity in Ser58Gln,Thrl0lGln,or Ser239Gln mutants.Lack of N-linked glycosylation site at residues 99-102(NSTF),the site of which is conserved in known beetle GHF 45 cellulases,showed loss of enzyme activity and reduced the molecular mass of the enzyme.In contrast,mutations in Ser58Gln or Ser239Gln affected neither the activity nor the apparent molecular mass of the enzyme,indicating that these sites did not lead to N-linked glycosylation.The present study demonstrates that N-linked glycosylation at residues 99-102(NSTF),while not essential for secretion,is required for Ag-EGase II enzyme activity.

分类号： Q96

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