Huynh Q K, Borgmeyer J R, Zobel J F
Department of Protein Biochemistry, Monsanto Company, St. Louis, MO 63198.
Biochem Biophys Res Commun. 1992 Jan 15;182(1):1-5. doi: 10.1016/s0006-291x(05)80103-2.
We have purified a 22 kDa protein from maize seeds to homogeneity by ammonium sulfate precipitation, chitin extraction and Mono-S column chromatography. The purified protein inhibited the growth of the agronomically important pathogens of potato wilt (Fusarium oxysporum) and tomato early blight (Alternaria solani). Sequence analysis of the purified protein showed that it has 52% homology with the sweet protein thaumatin (Edens, L., Hselinga, L., Klok, R., Ledeboer, A. M., Maat, J., Toonen, M. Y., Visser, C., and Verrips, C. (1982) Gene 18, 1-12), 57% homology with the pathogenesis-related protein (Cornelissen, B. J. C., Huijsduijnen, R. A. M., and Bol, J. F. (1986) Nature 321, 531-532) and 99% homology with the 22 kDa trypsin/alpha-amylase inhibitor (Richardson, M., Valdes-Rodriguez, S., and Blanco-Labra, A. (1987) Nature 327, 432-434).
我们通过硫酸铵沉淀、几丁质提取和单磺酸柱色谱法,从玉米种子中纯化出一种22 kDa的蛋白质,使其达到了均一性。纯化后的蛋白质抑制了马铃薯枯萎病(尖孢镰刀菌)和番茄早疫病(链格孢菌)这两种对农业具有重要意义的病原体的生长。对纯化蛋白质的序列分析表明,它与甜蛋白索马甜具有52%的同源性(伊登斯,L.,赫塞林加,L.,克洛,R.,勒德博尔,A. M.,马特,J.,图嫩,M. Y.,维瑟,C.,和韦里普斯,C.(1982年)《基因》第18卷,第1 - 12页),与病程相关蛋白具有57%的同源性(科内利森,B. J. C.,胡伊斯杜伊嫩,R. A. M.,和博尔,J. F.(1986年)《自然》第321卷,第531 - 532页),与22 kDa胰蛋白酶/α -淀粉酶抑制剂具有99%的同源性(理查森,M.,巴尔德斯 - 罗德里格斯,S.,和布兰科 - 拉布拉,A.(1987年)《自然》第327卷,第432 - 434页)。