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    • 5. 发明申请
    • In vivo library-versus-library selection of optimized protein-protein interactions
    • 体内文库对文库选择优化的蛋白质 - 蛋白质相互作用
    • US20050208577A1
    • 2005-09-22
    • US11134253
    • 2005-05-23
    • Stephen MichnickJoelle PelletierKatja ArndtAndreas Pluckthun
    • Stephen MichnickJoelle PelletierKatja ArndtAndreas Pluckthun
    • C07K14/435C12N15/10C12Q1/32C12Q1/68C40B30/04G01N33/53G01N33/542G01N33/573G01N33/58G01N33/68
    • C40B30/04C07K14/43595C07K2319/00C12N15/1055C12Q1/32G01N33/542G01N33/6845Y02A90/26
    • The present invention describes a rapid and efficient in vivo library-versus-library screening strategy for identifying optimally interacting pairs of heterodimerizing polypeptides. It allows for the screening of a protein library against a second protein library, rather than against a single bait protein, and thus has numerous applications in the study of protein-protein interactions. Additionally, it allows for the application of different selection stringencies. Two leucine zipper libraries, semi-randomized at the positions adjacent to the hydrophobic core, were genetically fused to either one of two designed fragments of the enzyme murine dihydrofolate reductase (mDHFR), and cotransformed into E. coli. Interaction between the library polypeptides was required for reconstitution of the enzymatic activity of mDHFR, allowing bacterial growth. Analysis of the resulting colonies revealed important biases in the zipper sequences relative to the original libraries, which are consistent with selection for stable, heterodimerizing pairs. Using more weakly associating mDHFR fragments, we increased the stringency of selection. We enriched the best performing leucine zipper pairs by multiple passaging of the pooled, selected colonies in liquid culture, as the best pairs allowed for better bacterial propagation. This competitive growth allowed small differences among the pairs to be amplified, and different sequence positions were enriched at different rates. We applied these selection processes to a library-versus-library sample of 2.0×106 combinations, and selected a novel leucine zipper pair which may be appropriate for use in further in vivo heterodimerization strategies.
    • 本发明描述了快速和有效的体内文库对文库筛选策略,用于鉴定异构二聚化多肽的最佳相互作用对。 它允许针对第二蛋白质文库筛选蛋白质文库,而不是针对单个诱饵蛋白质,因此在蛋白质 - 蛋白质相互作用的研究中具有许多应用。 此外,它允许应用不同的选择严格性。 两个亮氨酸拉链文库在与疏水核心相邻的位置半随机化,与酶二氢叶酸还原酶(mDHFR)的两个设计的片段中的任一个遗传融合,并共转化到大肠杆菌中。 需要文库多肽之间的相互作用来重构mDHFR的酶活性,从而允许细菌生长。 所得菌落的分析揭示了相对于原始文库的拉链序列的重要偏倚,这与选择稳定的异源二聚体对一致。 使用更弱的关联mDHFR片段,我们增加了选择的严格性。 我们通过在液体培养中多次传代合并的选定菌落,丰富了表现最好的亮氨酸拉链对,因为最佳对允许更好的细菌繁殖。 这种竞争性增长允许放大对中的小差异,并且以不同的速率富集不同的序列位置。 我们将这些选择过程应用于2.0×10 6组合的文库对文库样品,并选择了可能适用于进一步体内异二聚化策略的新型亮氨酸拉链对。
    • 9. 发明授权
    • Vivo library-versus-library selection of optimized protein-protein interactions
    • 体内文库与图书馆选择优化的蛋白质 - 蛋白质相互作用
    • US06897017B1
    • 2005-05-24
    • US09603885
    • 2000-06-26
    • Stephen William Watson MichnickJoelle N. PelletierKatja M. ArndtAndreas Pluckthun
    • Stephen William Watson MichnickJoelle N. PelletierKatja M. ArndtAndreas Pluckthun
    • C07K14/435C12N15/10C12Q1/32C12Q1/68C40B30/04G01N33/53G01N33/542G01N33/573G01N33/58G01N33/68C12N15/52C12P21/02
    • C40B30/04C07K14/43595C07K2319/00C12N15/1055C12Q1/32G01N33/542G01N33/6845Y02A90/26
    • The present invention describes a rapid and efficient in vivo library-versus-library screening strategy for identifying optimally interacting pairs of heterodimerizing polypeptides. It allows for the screening of a protein library against a second protein library, rather than against a single bait protein, and thus has numerous applications in the study of protein-protein interactions. Additionally, it allows for the application of different selection stringencies. Two leucine zipper libraries, semi-randomized at the positions adjacent to the hydrophobic core, were genetically fused to either one of two designed fragments of the enzyme murine dihydrofolate reductase (mDHFR), and cotransformed into E. coli. Interaction between the library polypeptides was required for reconstitution of the enzymatic activity of mDHFR, allowing bacterial growth. Analysis of the resulting colonies revealed important biases in the zipper sequences relative to the original libraries, which are consistent with selection for stable, heterodimerizing pairs. Using more weakly associating mDHFR fragments, we increased the stringency of selection. We enriched the best performing leucine zipper pairs by multiple passaging of the pooled, selected colonies in liquid culture, as the best pairs allowed for better bacterial propagation. This competitive growth allowed small differences among the pairs to be amplified, and different sequence positions were enriched at different rates. We applied these selection processes to a library-versus-library sample of 2.0×106 combinations, and selected a novel leucine zipper pair which may be appropriate for use in further in vivo heterodimerization strategies.
    • 本发明描述了快速和有效的体内文库对文库筛选策略,用于鉴定异构二聚化多肽的最佳相互作用对。 它允许针对第二蛋白质文库筛选蛋白质文库,而不是针对单个诱饵蛋白质,因此在蛋白质 - 蛋白质相互作用的研究中具有许多应用。 此外,它允许应用不同的选择严格性。 两个亮氨酸拉链文库在与疏水核心相邻的位置半随机化,与酶二氢叶酸还原酶(mDHFR)的两个设计的片段中的任一个遗传融合,并共转化到大肠杆菌中。 需要文库多肽之间的相互作用来重构mDHFR的酶活性,从而允许细菌生长。 所得菌落的分析揭示了相对于原始文库的拉链序列的重要偏倚,这与选择稳定的异源二聚体对一致。 使用更弱的关联mDHFR片段,我们增加了选择的严格性。 我们通过在液体培养中多次传代合并的选定菌落,丰富了表现最好的亮氨酸拉链对,因为最佳对允许更好的细菌繁殖。 这种竞争性增长允许放大对中的小差异,并且以不同的速率富集不同的序列位置。 我们将这些选择过程应用于2.0×10 6组合的文库对文库样品,并选择了可能适用于进一步体内异二聚化策略的新型亮氨酸拉链对。