Tumor Necrosis Factor Ligand (TNFL)-Tumor Necrosis Factor Receptor (TNFR) interactions control key cellular processes; however, the molecular basis of the specificity of these interactions remains poorly understood. Using the T-RMSD (tree based on root mean square deviation), a newly developed structure-based sequence clustering method, we have re-analyzed the available structural data to re-interpret the interactions between TNFLs and TNFRs. This improves the classification of both TNFLs and TNFRs, such that the new groups defined here are in much stronger agreement with structural and functional features than existing schemes. Our clustering approach also identifies traces of a convergent evolutionary process for TNFLs and TNFRs, leading us to propose the co-evolution of TNFLs and the third cysteine rich domain (CRD) of large TNFRs.
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With the exception of a few signaling incompetent decoy receptors, the receptors of the tumor necrosis factor receptor superfamily (TNFRSF) are signaling competent and engage in signaling pathways resulting in inflammation, proliferation, differentiation, and cell migration and also in cell death induction. TNFRSF receptors (TNFRs) become activated by ligands of the TNF superfamily (TNFSF). TNFSF ligands (TNFLs) occur as trimeric type II transmembrane proteins but often also as soluble ligand trimers released from the membrane-bound form by proteolysis.
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Division of Molecular Internal Medicine, Department of Internal Medicine II, University Hospital Würzburg, Würzburg, Germany.
Quantitative analysis of the binding of tumor necrosis factor (TNF) superfamily ligands (TNFLs) to TNF receptor superfamily receptors (TNFRs) is of crucial relevance for the understanding of the mechanisms of TNFR activation. Ligand binding studies are also a basic method required for the development and characterization of agonists and antagonists of TNFRs. TNFL-induced formation of fully active TNFR signaling complexes is a complex process.
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Bioinformatics and Genomics Program, Centre for Genomic Regulation (CRG) and UPF, Barcelona, Spain.
Tumor Necrosis Factor Ligand (TNFL)-Tumor Necrosis Factor Receptor (TNFR) interactions control key cellular processes; however, the molecular basis of the specificity of these interactions remains poorly understood. Using the T-RMSD (tree based on root mean square deviation), a newly developed structure-based sequence clustering method, we have re-analyzed the available structural data to re-interpret the interactions between TNFLs and TNFRs. This improves the classification of both TNFLs and TNFRs, such that the new groups defined here are in much stronger agreement with structural and functional features than existing schemes.
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