6qnu
Human Adenovirus type 3 fiber knob in complex with two copies of Desmoglein-2
Structural highlights
Disease[DSG2_HUMAN] Defects in DSG2 are the cause of familial arrhythmogenic right ventricular dysplasia type 10 (ARVD10) [MIM:610193]; also known as arrhythmogenic right ventricular cardiomyopathy 10 (ARVC10). ARVD is an autosomal dominant disease characterized by partial degeneration of the myocardium of the right ventricle, electrical instability, and sudden death. It is clinically defined by electrocardiographic and angiographic criteria; pathologic findings, replacement of ventricular myocardium with fatty and fibrous elements, preferentially involve the right ventricular free wall.[1] [2] [3] [4] Genetic variations in DSG2 are the cause of susceptibility to cardiomyopathy dilated type 1BB (CMD1BB) [MIM:612877]. A disorder characterized by ventricular dilation and impaired systolic function, resulting in congestive heart failure and arrhythmia. Patients are at risk of premature death.[5] Function[SPIKE_ADE03] Forms spikes that protrude from each vertex of the icosahedral capsid. Interacts with host receptor CD46 to provide virion initial attachment to target cell. Fiber proteins are shed during virus entry, when virus is still at the cell surface. Heparan sulfate might also play a role in virus binding. [DSG2_HUMAN] Component of intercellular desmosome junctions. Involved in the interaction of plaque proteins and intermediate filaments mediating cell-cell adhesion. Publication Abstract from PubMedAttachment of human adenovirus (HAd) to the host cell is a critical step of infection. Initial attachment occurs via the adenoviral fibre knob protein and a cellular receptor. Here we report the cryo-electron microscopy (cryo-EM) structure of a <100 kDa non-symmetrical complex comprising the trimeric HAd type 3 fibre knob (HAd3K) and human desmoglein 2 (DSG2). The structure reveals a unique stoichiometry of 1:1 and 2:1 (DSG2: knob trimer) not previously observed for other HAd-receptor complexes. We demonstrate that mutating Asp261 in the fibre knob is sufficient to totally abolish receptor binding. These data shed new light on adenovirus infection strategies and provide insights for adenoviral vector development and structure-based design. CryoEM structure of adenovirus type 3 fibre with desmoglein 2 shows an unusual mode of receptor engagement.,Vassal-Stermann E, Effantin G, Zubieta C, Burmeister W, Iseni F, Wang H, Lieber A, Schoehn G, Fender P Nat Commun. 2019 Mar 12;10(1):1181. doi: 10.1038/s41467-019-09220-y. PMID:30862836[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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