TAILIEUCHUNG - Báo cáo khoa học: Crystal structure of basic 7S globulin, a xyloglucanspecific endo-b-1,4-glucanase inhibitor protein-like protein from soybean lacking inhibitory activity against endo-b-glucanase

b-Linked glucans such as cellulose and xyloglucan are important compo-nents of the cell walls of most dicotyledonous plants. Theseb-linked glu-cans are constantly exposed to degradation by various endo-b-glucanases from pathogenic bacteria and fungi. | IFEBS Journal Crystal structure of basic 7S globulin a xyloglucanspecific endo-p-1 4-glucanase inhibitor protein-like protein from soybean lacking inhibitory activity against endo-p-glucanase Takuya Yoshizawa1 Toshiyuki Shimizu2 Mayuki Yamabe1 Misako Taichi3 4 Yuji Nishiuchi3 4 Naoki Shichijo1 Satoru Unzai1 Hisashi Hirano1 Mamoru Sato1 and Hiroshi Hashimoto1 1 Graduate Schoolof Nanobioscience Yokohama City University Japan 2 Graduate Schoolof PharmaceuticalScience The University of Tokyo Japan 3 SAITO Research Center Peptide Institute Inc. Osaka Japan 4 Graduate Schoolof Science Osaka University Japan Keywords crystal structure glucanase inhibitor legume protein macromolecular assembly plant defense Correspondence H. Hashimoto Graduate School of Nanobioscience Yokohama City University 1-7-29 Suehiro-cho Tsurumi-ku Yokohama 230-0045 Japan Fax 81 45 508 7365 Tel 81 45 508 7227 E-mail hash@ Received 22 February 2011 revised 25 March 2011 accepted 28 March 2011 doi b-Linked glucans such as cellulose and xyloglucan are important components of the cell walls of most dicotyledonous plants. These b-linked glucans are constantly exposed to degradation by various endo-b-glucanases from pathogenic bacteria and fungi. To protect the cell wall from degradation by such enzymes plants secrete proteinaceous endo-b-glucanases inhibitors such as xyloglucan-specific endo-b-1 4-glucanase inhibitor protein XEGIP in tomato. XEGIPs typically inhibit xyloglucanase a member of the glycoside hydrolase GH 12 family. XEGIPs are also found in legumes including soybean and lupin. To date tomato XEGIP has been well studied whereas XEGIPs from legumes are less well understood. Here we determined the crystal structure of basic 7S globulin Bg7S a XEGIP from soybean which represents the first three-dimensional structure of XE-GIP. Bg7S formed a tetramer with pseudo-222 symmetry. Analytical centrifugation and size exclusion chromatography .

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