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    • 9. 发明授权
    • Insecticidal protein fragments
    • 杀虫蛋白片段
    • US06251656B1
    • 2001-06-26
    • US09422833
    • 1999-10-21
    • Michael J. Adang
    • Michael J. Adang
    • C12N120
    • C12N15/8216C07K14/325C12N15/8286Y02A40/162
    • The Bacillus thuringiensis var. kurstaki HD-73 crystal protein gene was cloned into pBR322. E. coli cells harboring this recombinant plasmid produced a 130 kD protoxin that was toxic to Manduca sexta (tobacco hornworm) larvae. Plasmids having the 3′-end of the protoxin gene deleted where also constructed. E. coli cells harboring these deleted plasmids produced an active, soluble 68 kD toxin, provided that the 3′-deletion had not removed sequences encoding the 68 kD toxin. The invention provides methods to produce 68 kD toxin protein by constructing partial protoxin genes encoding the toxin followed by expression of the genes in living cells. Useful plasmids and cells are also provided.
    • 苏云金芽孢杆菌变种 将kurstaki HD-73晶体蛋白基因克隆到pBR322中。 含有该重组质粒的大肠杆菌细胞产生对Manduca sexta(烟草蛔虫)幼虫有毒的130kD原毒素。 具有前毒素基因3'末端的质粒也被删除。 携带这些缺失质粒的大肠杆菌细胞产生活性的可溶性68kD毒素,条件是3'缺失未除去编码68kD毒素的序列。 本发明提供了通过构建编码毒素的部分原毒素基因,然后在活细胞中表达基因来产生68kD毒素蛋白质的方法。 还提供了有用的质粒和细胞。