数字农科院2.0

Studies On The Chitin/Chitosan Binding P.roperties Of Six Cuticular P roteins Analogous To Peritrophin 3 From Bombyx Mori

文献类型： 外文期刊

作者： Ren, Y.;Yang, Q.;Qu, M.;Yang, Q.;Liu, Y.

作者机构：

关键词： chitin binding protein; CPAP3; cuticle; chitin assembly; chitin deacetylase; chitosan

期刊名称： INSECT MOLECULAR BIOLOGY

ISSN： 0962-1075

年卷期： 2017 年 26 卷 4.0 期

页码：

收录情况： JCR（2021版）

摘要： Chitin deacetylation is required to make the cuticle rigid and compact through chitin chain crosslinking. Thus it is presumed that specialized proteins are required to bind deacetylated chitin chains together. However, deacetylated-chitin binding proteins have not ever been reported. In a previous work, six cuticular proteins analogous to peritrophin 3 (CPAP3s) were found to be abundant in the moulting fluid of Bombyx mori. In this study, these BmCPAP3s (BmCPAP3-A1, BmCPAP3-A2, BmCPAP3-B, BmCPAP3-C, BmCPAP3D1 and BmCPAP3-D2) were cloned and expressed in Escherichia coli and purified using metal-chelating affinity chromatography. Their binding activities demonstrated that although all of the BmCPAP3s showed similar binding abilities toward crystalline chitin and colloidal chitin, they differed in their affinities toward partially and fully deacetylated chitin. Amongst them, BmCPAP3-D1 exhibited the highest binding activity toward deacetylated chitin. The gene expression pattern of BmCPAP3-D1 was similar to BmCPAP3-A1 and BmCPAP3-C at most stages except that it was dramatically upregulated at the beginning of the pupa to adult transition stage. This work is the first report of a chitinbinding protein, BmCPAP3-D1, which exhibits high binding affinity to deacetylated chitin.

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