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| SH3 | |
|---|---|
| Name | SH3 domain |
| Caption | Crystal structure of a canonical SH3 domain |
| Pfam | PF00018 |
| Interpro | IPR001452 |
| Scop | d1sh3a_ |
SH3
The SH3 domain is a small, conserved protein interaction module found in numerous signaling and structural proteins across eukaryotes, bacteria, and viruses. It mediates protein–protein associations by recognizing proline-rich peptide motifs and contributes to assembly of multi-protein complexes involved in signal transduction and cytoskeletal regulation. The domain has been characterized by structural biology, genetics, and biochemical studies linking it to diverse cellular processes and human disease.
The SH3 domain was initially identified in studies of Src-family tyrosine kinases, and subsequent work connected it to proteins studied by researchers of the Nobel Prize in Physiology or Medicine, Max Perutz, John Kendrew, and groups at institutions such as Harvard University, Stanford University, and the Max Planck Society. Early structural insights derived from laboratories at European Molecular Biology Laboratory and Cold Spring Harbor Laboratory informed functional models cited by investigators in papers appearing in journals from Nature and Science. The domain typically comprises approximately 60–70 amino acids and occurs in proteins such as those encoded by the SRC proto-oncogene, GRB2, and adapters involved in pathways characterized by studies on Epidermal growth factor receptor and T cell receptor signaling.
SH3 adopts a compact β-barrel fold formed by five or six β-strands arranged into two orthogonal β-sheets; structures were solved by crystallographers influenced by methods developed at Rosalind Franklin-era facilities and modern synchrotrons at European Synchrotron Radiation Facility. The ligand-binding surface recognizes PxxP motifs in target peptides via a hydrophobic pocket and electrostatic contacts; mutational analyses performed in labs affiliated with University of Cambridge and Massachusetts Institute of Technology mapped specificity determinants. Structural comparisons across families used databases curated by European Bioinformatics Institute and classification in resources from Protein Data Bank and Pfam. High-resolution structures resolved by teams associated with Nobel Prize in Chemistry laureates informed detailed models of conformational dynamics relevant to allosteric regulation observed in experiments from groups at University of California, Berkeley and University of Oxford.
SH3-containing proteins act as scaffolds and adaptors in pathways centered on receptors and enzymes studied in contexts such as Platelet-derived growth factor receptor, Insulin receptor, and B cell receptor signaling. They coordinate actin dynamics through interactions with regulators characterized by researchers focusing on Wiskott–Aldrich syndrome protein, N-WASP, and components of complexes analyzed in work from Johns Hopkins University and Salk Institute. Examples include roles in endocytosis linked to proteins examined in studies at European Molecular Biology Organization member labs and in neuronal development tied to investigations at Columbia University and University College London. Genetic screens in model organisms such as Saccharomyces cerevisiae, Drosophila melanogaster, and Caenorhabditis elegans attributed phenotypes to SH3-mediated interactions that intersect with pathways like those involving Ras, Rho family GTPases, and MAPK cascades.
Aberrant SH3 interactions have been implicated in oncogenesis associated with alterations in proteins such as the SRC proto-oncogene, fusion oncoproteins studied in acute myeloid leukemia research, and adaptor dysregulation reported in studies at Memorial Sloan Kettering Cancer Center. Mutations affecting SH3-mediated signaling contribute to immunodeficiencies exemplified by research on Wiskott–Aldrich syndrome and to neurodegenerative mechanisms explored at institutions including Massachusetts General Hospital and Karolinska Institutet. Therapeutic strategies targeting SH3 interfaces inspired drug-discovery programs at pharmaceutical companies like Pfizer and Novartis utilize peptide mimetics, small molecules, and engineered proteins informed by screening platforms developed in collaborations with Genentech and academic spinouts from MIT.
SH3 domains are widespread across taxa, with evolutionary analyses by consortia including researchers from Wellcome Trust and National Institutes of Health revealing diversification into subfamilies present in eukaryotic adaptors, bacterial signaling proteins, and viral effectors exploited by pathogens studied by groups at Centers for Disease Control and Prevention. Classification schemes in databases maintained by UniProt and InterPro separate canonical SH3s from related modules such as those described in comparative genomics projects at European Genome-phenome Archive. Phylogenetic studies referencing datasets from Human Genome Project collaborators identified lineage-specific expansions in organisms investigated at Oxford University and University of Tokyo.
Characterization of SH3 domains integrates structural methods like X-ray crystallography and NMR spectroscopy performed at facilities such as Diamond Light Source and Brookhaven National Laboratory, biophysical assays including isothermal titration calorimetry and surface plasmon resonance developed in labs at Imperial College London and ETH Zurich, and cellular approaches using co-immunoprecipitation and fluorescence microscopy practiced widely at Yale University and University of California, San Diego. High-throughput interaction mapping via yeast two-hybrid and affinity purification–mass spectrometry was advanced by initiatives from European Molecular Biology Laboratory and large-scale projects funded by European Research Council. Computational prediction and molecular dynamics simulations used resources provided by National Center for Supercomputing Applications and were disseminated through consortia involving Stanford University and Princeton University.
Category:Protein domains