Structure-based design of a streptavidin mutant specific for an artificial biotin analogue
作者:Tatsuya Kawato、Eiichi Mizohata、Yohei Shimizu、Tomohiro Meshizuka、Tomohiro Yamamoto、Noriaki Takasu、Masahiro Matsuoka、Hiroyoshi Matsumura、Tatsuhiko Kodama、Motomu Kanai、Hirofumi Doi、Tsuyoshi Inoue、Akira Sugiyama
DOI:10.1093/jb/mvv004
日期:2015.6
using antibodies, a streptavidin mutant with low immunogenicity, termed low immunogenic streptavidin mutant No. 314 (LISA-314), was produced previously as a drug delivery tool. However, endogenous biotins (BTNs) with high affinity (Kd < 10(-10) M) for the binding pocket of LISA-314 prevents access of exogenous BTN-labelled anticancer drugs. In this study, we improve the binding pocket of LISA-314 to
对于使用抗体的多步骤预靶向方法,先前制备了具有低免疫原性的链霉亲和素突变体,称为低免疫原性链霉亲和素突变体No.314(LISA-314),作为药物递送工具。但是,对LISA-314结合袋具有高亲和力(Kd <10(-10)M)的内源性生物素(BTN)阻止了外源性BTN标记的抗癌药物的进入。在这项研究中,我们改善了LISA-314的结合口袋,以消除其对内源BTN物种的亲和力,因此确保新设计的LISA-314仅结合人工BTN类似物。分两个步骤进行三个氨基酸残基的置换,以开发出称为V212的突变体,该突变体可选择性结合6-(5-((3aS,4S,6aR)-2-亚氨基六氢-1H-硫代[3,4-d ]咪唑-4-基)戊酰胺基)己酸(亚氨基生物素长尾巴,IMNtail)。表面等离振子共振结果表明,V212对IMNtail的Kd值为5.9×10(-7)M,但对内源BTN种类没有结合亲和力。该V212 /