Objective In kinesin-3,the neck coil correlates with the following segments to form an extended neck that contains a characteristic hinge diverse from a proline in KIF13B to a long flexible linker in KIF1A.The functio...Objective In kinesin-3,the neck coil correlates with the following segments to form an extended neck that contains a characteristic hinge diverse from a proline in KIF13B to a long flexible linker in KIF1A.The function of this neck hinge for controlling processive movement,however,remains unclear.Methods We made a series of modifications to the neck hinges of KIF13B and KIF1A and tested their movement using a single-molecule motility assay.Results In KIF13B,the insertion of flexible residues before or after the proline differentially impacts the processivity or velocity,while the removal of this proline increases the both.In KIF1A,the deletion of entire flexible neck hinge merely enhances the processivity.The engineering of these hinge-truncated necks of kinesin-3 into kinesin-1 similarly boosts the processive movement of kinesin-1.Conclusion The neck hinge in kinesin-3 controls its processive movement and proper modifications tune the motor motility,which provides a novel strategy to reshape the processive movement of kinesin motors.展开更多
文摘Objective In kinesin-3,the neck coil correlates with the following segments to form an extended neck that contains a characteristic hinge diverse from a proline in KIF13B to a long flexible linker in KIF1A.The function of this neck hinge for controlling processive movement,however,remains unclear.Methods We made a series of modifications to the neck hinges of KIF13B and KIF1A and tested their movement using a single-molecule motility assay.Results In KIF13B,the insertion of flexible residues before or after the proline differentially impacts the processivity or velocity,while the removal of this proline increases the both.In KIF1A,the deletion of entire flexible neck hinge merely enhances the processivity.The engineering of these hinge-truncated necks of kinesin-3 into kinesin-1 similarly boosts the processive movement of kinesin-1.Conclusion The neck hinge in kinesin-3 controls its processive movement and proper modifications tune the motor motility,which provides a novel strategy to reshape the processive movement of kinesin motors.
文摘目的用蛋白质组学方法寻找先兆子痫患者血清蛋白的差异表达。方法 5例重度先兆子痫患者血清和5例正常妊娠对照血清分别混合。每个混合样本血清用亲水亲脂柱(hydrophilic-lipophilic balance,HLB)和多肽配体库磁珠(peptide ligandlibrary bead,PLLB)方法去除表达丰富蛋白,使低含量蛋白表达,洗脱液用1D胶联合液相色谱质谱串联技术(liquidchromatography tandem mass spectrometry,LC-MS/MS)对蛋白表达进行定量分析;结果 HLB方法共有28种蛋白发生差异表达;PLLB方法共有51种蛋白发生差异表达,包括白介素17F(IL-17F)和铜蓝蛋白(ceruloplasimin,CP)等。结论 PLLB联合1D胶-LC-MS/MS是鉴定血清中差异表达蛋白的一种有效方法;炎性反应因子可能与先兆子痫的发病机制有关。
