Comprehensive Cross-Linking Mass Spectrometry Reveals Parallel Orientation and Flexible Conformations of Plant HOP2-MND1.

Comprehensive Cross-Linking Mass Spectrometry Reveals Parallel Orientation and Flexible Conformations of Plant HOP2-MND1.
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DOI:
10.1021/acs.jproteome.5b00903
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发表时间:
2015-12-04
影响因子:
4.4
通讯作者:
Mechtler K
Mechtler K
中科院分区:
生物学2区
文献类型:
--
作者:
Rampler E;Stranzl T;Orban-Nemeth Z;Hollenstein DM;Hudecz O;Schlögelhofer P;Mechtler K

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HOP 2 − MND 1异二聚体是植物和其他真核生物减数分裂同源重组所必需的,并促进DNA双链断裂的修复。我们研究了HOP 2 − MND 1的构象灵活性,这对于理解异二聚体的机制细节很重要,化学交联结合质谱(XL−MS)。最终的XL-MS工作流程包括在数据评估之前使用互补交联剂、淬灭、消化、尺寸排阻富集和基于HCD的LC-MS/MS检测。我们应用了两种不同的同双功能胺反应性交联剂(DSS和BS 2G)和一种零长度异双功能交联剂(EDC)。在通过蛋白质穿线和蛋白质-蛋白质对接进行3D结构预测之前,分析四个生物重复的交联肽,用于交联引导的分子建模。尺寸排阻富集步骤的小型化减少了所需的起始材料,导致大量的交联肽,并允许重复分析。HOP 2 − MND 1的主要相互作用位点在中心卷曲螺旋结构域中被确定,并且预测HOP 2和MND 1在复合物内的开放共线平行排列。此外,观察到两个复杂的合作伙伴的C-末端封端螺旋的灵活性,这表明在溶液中共存的一个封闭的复杂构象。
The HOP2−MND1 heterodimer is essential for meiotic homologous recombination in plants and other eukaryotes and promotes the repair of DNA double-strand breaks. We investigated the conformational flexibility of HOP2−MND1, important for understanding the mechanistic details of the heterodimer, with chemical cross-linking in combination with mass spectrometry (XL−MS). The final XL−MS workflow encompassed the use of complementary cross-linkers, quenching, digestion, size exclusion enrichment, and HCD-based LC–MS/MS detection prior to data evaluation. We applied two different homobifunctional amine-reactive cross-linkers (DSS and BS2G) and one zero-length heterobifunctional cross-linker (EDC). Cross-linked peptides of four biological replicates were analyzed prior to 3D structure prediction by protein threading and protein–protein docking for cross-link-guided molecular modeling. Miniaturization of the size-exclusion enrichment step reduced the required starting material, led to a high amount of cross-linked peptides, and allowed the analysis of replicates. The major interaction site of HOP2−MND1 was identified in the central coiled-coil domains, and an open colinear parallel arrangement of HOP2 and MND1 within the complex was predicted. Moreover, flexibility of the C-terminal capping helices of both complex partners was observed, suggesting the coexistence of a closed complex conformation in solution.
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