Isolation and Characterization of a Novel Chitosan-Binding Protein from Non-Heading Chinese Cabbage Leaves

作     者：Hui-PingCHEN Lang-LaiXU 

作者机构：CollegeofLifeSciencesNanfingAgriculturalUniversityNanjing210095China／／CollegeofAgronomySouthChinaTropicalAgriculturalUniversityDanzhou571737China CollegeofLifeSciencesNanfingAgriculturalUniversityNanjing210095China 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2005年第47卷第4期

页      面：452-456页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 

主　　题：binding-protein chitosan non-heading Chinese cabbage 

摘      要：Abstract: To know the mechanism of ammonia assimilation in non-heading Chinese cabbage (Brassica campestrish L. ssp. chinensis (L.) Makino) leaves regulated by chitosan (CTS), a CTS-binding protein was isolated from non-heading Chinese cabbage leaves using the chitosan affinity chromatography approach and this CTS-binding protein was partially characterized. The profile of the 53.1 kDa purified protein on sodium dodecyl sulfate-polyacrylamide gel electrophoresis was compared with the native molecular weight of 106.5 kDa, which indicated that the purified protein was a dimer with identical subunits. After isoelectric focusing, a band was obtained at pH 8.25. The agglutination test and periodic acid-Schiff staining further revealed that the protein was a glycoprotein with lectin activity. Moreover, the purified protein contained 17.4% (w/w) neutral carbohydrate and 82.56% (w/w) protein. The comparison of this protein and the 67 kDa CTS-binding protein isolated previously from Rubus culture tissue exhibited some differences in characterization. According to results of peptide mass fingerprinting analysis, the protein purified in the present study does not show any similarity with any protein in the protein data bank. Thus, it was deduced that the protein purified in the present study is a novel CTS-binding protein.