Cited by 121Mass Spectrometry Techniques and ApplicationsAdvanced Proteomics Techniques and ApplicationsProtein Structure and Dynamics

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xVis: a web server for the schematic visualization and interpretation of crosslink-derived spatial restraints

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Abstract

The identification of crosslinks by mass spectrometry has recently been established as an integral part of the hybrid structural analysis of protein complexes and networks. The crosslinking analysis determines distance restraints between two covalently linked amino acids which are typically summarized in a table format that precludes the immediate and comprehensive interpretation of the topological data. xVis displays crosslinks in clear schematic representations in form of a circular, bar or network diagram. The interactive graphs indicate the linkage sites and identification scores, depict the spatial proximity of structurally and functionally annotated protein regions and the evolutionary conservation of amino acids and facilitate clustering of proteins into subcomplexes according to the crosslink density. Furthermore, xVis offers two options for the qualitative assessment of the crosslink identifications by filtering crosslinks according to identification scores or false discovery rates and by displaying the corresponding fragment ion spectrum of each crosslink for the manual validation of the mass spectrometric data. Our web server provides an easy-to-use tool for the fast topological and functional interpretation of distance information on protein complex architectures and for the evaluation of crosslink fragment ion spectra. xVis is available under a Creative Commons Attribution-ShareAlike 4.0 International license at http://xvis.genzentrum.lmu.de/.

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Crossref · 10.1093/nar/gkv463

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Figures

Figure 1. Topological analysis of the INO80 chromatin remodeler in complex with its nucleosome substrate. (A) Identification of subcomplexes and assignment to different structural modules using EM, chemical crosslinking and biochemical assays. (B) Crosslinked INO80 subunits are visualized and alphabetically sorted in a circular representation using xVis. The protein names are colored according to the modules in (A). (C) Hierarchical clustering of INO80 subunits based on crosslinks displayed in a circular diagram by xVis. (D) Hierarchical clustering of INO80 subunits based on crosslinks shown in a bar diagram by xVis. Bars represent InterPro domains (Figure 3A) (inter-protein crosslinks in black, intra-protein crosslinks in red).
Figure 1. Topological analysis of the INO80 chromatin remodeler in complex with its nucleosome substrate. (A) Identification of subcomplexes and assignment to different structural modules using EM, chemical crosslinking and biochemical assays. (B) Crosslinked INO80 subunits are visualized and alphabetically sorted in a circular representation using xVis. The protein names are colored according to the modules in (A). (C) Hierarchical clustering of INO80 subunits based on crosslinks displayed in a circular diagram by xVis. (D) Hierarchical clustering of INO80 subunits based on crosslinks shown in a bar diagram by xVis. Bars represent InterPro domains (Figure 3A) (inter-protein crosslinks in black, intra-protein crosslinks in red).CC BY-NC · PubMed Central
Figure 2. Topological analysis of the INO80 - nucleosome complex by applying the Markov Cluster (MCL) Algorithm in the network diagram. (A) Subunits non-clustered (all proteins blue colored). (B) Subunits clustered with the MCL parameters expansion=2 and inflation=1 separates the Nhp10 subcomplex (light blue). (C) Subunits clustered with expansion=1 and inflation=3 identifies several INO80 subcomplexes. (D) Proteins clustered like in (C) with crosslinks filtered by the identification score (cut-off 27).
Figure 2. Topological analysis of the INO80 - nucleosome complex by applying the Markov Cluster (MCL) Algorithm in the network diagram. (A) Subunits non-clustered (all proteins blue colored). (B) Subunits clustered with the MCL parameters expansion=2 and inflation=1 separates the Nhp10 subcomplex (light blue). (C) Subunits clustered with expansion=1 and inflation=3 identifies several INO80 subcomplexes. (D) Proteins clustered like in (C) with crosslinks filtered by the identification score (cut-off 27).CC BY-NC · PubMed Central
Figure 3. Customized annotations in xVis. (A) Selective representation of the Rvb1/2 and Ino80/Ies2 modules with the subunit Arp8 and histone H2A in a network diagram showing annotations from InterPro (top bars in the protein representation) and user-defined domains (bottom bars). (B) Evolutionary conservation of amino acid positions in the proteins Ino80 and Arp8 (bottom bars) obtained by the ConSurf webserver. (C) InterPro annotation legend used in (A) and (B). (D) User-defined domains displayed in (A).
Figure 3. Customized annotations in xVis. (A) Selective representation of the Rvb1/2 and Ino80/Ies2 modules with the subunit Arp8 and histone H2A in a network diagram showing annotations from InterPro (top bars in the protein representation) and user-defined domains (bottom bars). (B) Evolutionary conservation of amino acid positions in the proteins Ino80 and Arp8 (bottom bars) obtained by the ConSurf webserver. (C) InterPro annotation legend used in (A) and (B). (D) User-defined domains displayed in (A).CC BY-NC · PubMed Central
Figure 4. Topology of a network of modular PP2A complexes displayed in a network diagram. Proteins were grouped by the MCL algorithm applying the parameters expansion=2 and inflation=2 (STRIPAK, B’’’/striatin-interacting phosphatase and kinase, STRIPAK, complex; TCP1 ring complex, TRiC).
Figure 4. Topology of a network of modular PP2A complexes displayed in a network diagram. Proteins were grouped by the MCL algorithm applying the parameters expansion=2 and inflation=2 (STRIPAK, B’’’/striatin-interacting phosphatase and kinase, STRIPAK, complex; TCP1 ring complex, TRiC).CC BY-NC · PubMed Central

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Metadata

Authors
Grimm, M., Zimniak, T., Kahraman, A., & Herzog, F.
Affiliations
  • Ludwig-Maximilians-Universität München (DE)
  • University of Zurich (CH)
Corresponding author
Herzog, Franz
Venue
Nucleic Acids Research
Published
2015-05-08
Volume
43
Issue
W1
Pages
W362-W369
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W1644001471
Cited by
121
References
30
Citations by year
2026: 3 · 2025: 2 · 2024: 14 · 2023: 9 · 2022: 10 · 2021: 17 · 2020: 17 · 2019: 13 · 2018: 15 · 2017: 11 · 2016: 9 · 2015: 1
FWCI
5.35
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion, cc-by-sa)
Funders
Deutsche Forschungsgemeinschaft (GRK1721)
Topics
  • Physical Sciences › Chemistry › Spectroscopy › Mass Spectrometry Techniques and Applications
  • Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
crosslinking, distance restraints, protein complexes, protein networks, web server, false discovery rate, fragment ion spectra, evolutionary conservation
MeSH terms
Algorithms, Amino Acids, Computer Graphics, Cross-Linking Reagents, Histones, Nucleosomes, Software, Mass Spectrometry, Internet, Chromatin Assembly and Disassembly, Multiprotein Complexes

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