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
中科院分区:
文献类型:
--
作者:
Rampler E;Stranzl T;Orban-Nemeth Z;Hollenstein DM;Hudecz O;Schlögelhofer P;Mechtler K
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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影响因子:
5.6
作者:
Doberenz, Claudia;Zorn, Michael;Sawers, R. Gary
通讯作者:
Sawers, R. Gary
影响因子:
4
作者:
Kerzendorfer, Claudia;Vignard, Julien;Schloegelhofer, Peter
通讯作者:
Schloegelhofer, Peter
影响因子:
4.8
作者:
Enomoto, R;Kinebuchi, T;Yokoyama, S
通讯作者:
Yokoyama, S
影响因子:
3.7
作者:
Kahraman A;Herzog F;Leitner A;Rosenberger G;Aebersold R;Malmström L
通讯作者:
Malmström L
DOI:
10.1111/j.1365-313x.2011.04848.x
发表时间:
2012-03
期刊:
The Plant journal : for cell and molecular biology
影响因子:
--
作者:
Engelsberger WR;Schulze WX
通讯作者:
Schulze WX