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Nucleic Acids Res. 2015 Jul 1;43(W1):W362-9. doi: 10.1093/nar/gkv463. Epub 2015 May 8.

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

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Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, Munich 81377, Germany.
Institute of Molecular Life Sciences, University of Zurich, Zurich 8057, Switzerland.
Gene Center and Department of Biochemistry, Ludwig-Maximilians-Universität München, Munich 81377, Germany


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

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