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Nucleic Acids Res ; 50(D1): D497-D508, 2022 01 07.
Article in English | MEDLINE | ID: covidwho-2232151


Almost twenty years after its initial release, the Eukaryotic Linear Motif (ELM) resource remains an invaluable source of information for the study of motif-mediated protein-protein interactions. ELM provides a comprehensive, regularly updated and well-organised repository of manually curated, experimentally validated short linear motifs (SLiMs). An increasing number of SLiM-mediated interactions are discovered each year and keeping the resource up-to-date continues to be a great challenge. In the current update, 30 novel motif classes have been added and five existing classes have undergone major revisions. The update includes 411 new motif instances mostly focused on cell-cycle regulation, control of the actin cytoskeleton, membrane remodelling and vesicle trafficking pathways, liquid-liquid phase separation and integrin signalling. Many of the newly annotated motif-mediated interactions are targets of pathogenic motif mimicry by viral, bacterial or eukaryotic pathogens, providing invaluable insights into the molecular mechanisms underlying infectious diseases. The current ELM release includes 317 motif classes incorporating 3934 individual motif instances manually curated from 3867 scientific publications. ELM is available at:

Communicable Diseases/genetics , Databases, Protein , Host-Pathogen Interactions/genetics , Protein Interaction Domains and Motifs , Software , Actin Cytoskeleton/chemistry , Actin Cytoskeleton/metabolism , Animals , Binding Sites , Cell Cycle/genetics , Cell Membrane/chemistry , Cell Membrane/metabolism , Communicable Diseases/metabolism , Communicable Diseases/virology , Cyclins/chemistry , Cyclins/genetics , Cyclins/metabolism , Eukaryotic Cells/cytology , Eukaryotic Cells/metabolism , Eukaryotic Cells/virology , Gene Expression Regulation , Humans , Integrins/chemistry , Integrins/genetics , Integrins/metabolism , Mice , Molecular Sequence Annotation , Protein Binding , Rats , Saccharomyces cerevisiae/genetics , Saccharomyces cerevisiae/metabolism , Signal Transduction , Transport Vesicles/chemistry , Transport Vesicles/metabolism , Viruses/genetics , Viruses/metabolism
Front Pharmacol ; 13: 982484, 2022.
Article in English | MEDLINE | ID: covidwho-2080219


Recent years have witnessed a growing interest in the biological activity of metal complexes of α-aminophosphonates. Here for the first time, a detailed DFT study on five α-aminophosphonate ligated mononuclear/dinuclear CuII complexes is reported using the dispersion corrected density functional (B3LYP-D2) method. The electronic structures spin densities, FMO analysis, energetic description of spin states, and theoretical reactivity behaviour using molecular electrostatic potential (MEP) maps of all five species are reported. All possible spin states of the dinuclear species were computed and their ground state S values were determined along with the computation of their magnetic coupling constants. NBO analysis was also performed to provide details on stabilization energies. A molecular docking study was performed for the five complexes against two SARS-CoV-2 coronavirus protein targets (PDB ID: 6LU7 and 7T9K). The docking results indicated that the mononuclear species had a higher binding affinity for the targets compared to the dinuclear species. Among the species investigated, species I showed the highest binding affinity with the SARS-CoV-2 Omicron protease. NPA charge analysis showed that the heteroatoms of model species III had a more nucleophilic nature. A comparative study was performed to observe any variations and/or correlations in properties among all species.

Sci Signal ; 14(665)2021 01 12.
Article in English | MEDLINE | ID: covidwho-1029425


The first reported receptor for SARS-CoV-2 on host cells was the angiotensin-converting enzyme 2 (ACE2). However, the viral spike protein also has an RGD motif, suggesting that cell surface integrins may be co-receptors. We examined the sequences of ACE2 and integrins with the Eukaryotic Linear Motif (ELM) resource and identified candidate short linear motifs (SLiMs) in their short, unstructured, cytosolic tails with potential roles in endocytosis, membrane dynamics, autophagy, cytoskeleton, and cell signaling. These SLiM candidates are highly conserved in vertebrates and may interact with the µ2 subunit of the endocytosis-associated AP2 adaptor complex, as well as with various protein domains (namely, I-BAR, LC3, PDZ, PTB, and SH2) found in human signaling and regulatory proteins. Several motifs overlap in the tail sequences, suggesting that they may act as molecular switches, such as in response to tyrosine phosphorylation status. Candidate LC3-interacting region (LIR) motifs are present in the tails of integrin ß3 and ACE2, suggesting that these proteins could directly recruit autophagy components. Our findings identify several molecular links and testable hypotheses that could uncover mechanisms of SARS-CoV-2 attachment, entry, and replication against which it may be possible to develop host-directed therapies that dampen viral infection and disease progression. Several of these SLiMs have now been validated to mediate the predicted peptide interactions.

COVID-19/virology , Host Microbial Interactions/physiology , SARS-CoV-2/physiology , SARS-CoV-2/pathogenicity , Virus Internalization , Amino Acid Sequence , Angiotensin-Converting Enzyme 2/chemistry , Angiotensin-Converting Enzyme 2/genetics , Angiotensin-Converting Enzyme 2/physiology , Animals , COVID-19/therapy , Conserved Sequence , Host Microbial Interactions/genetics , Humans , Integrins/chemistry , Integrins/genetics , Integrins/physiology , Intrinsically Disordered Proteins/chemistry , Intrinsically Disordered Proteins/genetics , Intrinsically Disordered Proteins/physiology , Models, Biological , Models, Molecular , Oligopeptides/chemistry , Oligopeptides/genetics , Oligopeptides/physiology , Protein Interaction Domains and Motifs/genetics , Protein Interaction Domains and Motifs/physiology , Protein Sorting Signals/genetics , Protein Sorting Signals/physiology , Receptors, Virus/chemistry , Receptors, Virus/genetics , Receptors, Virus/physiology , SARS-CoV-2/genetics , Spike Glycoprotein, Coronavirus/chemistry , Spike Glycoprotein, Coronavirus/genetics , Spike Glycoprotein, Coronavirus/physiology