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TitleKinetic and structural analysis of coxsackievirus B3 receptor interactions and formation of the A-particle.
Journal, issue, pagesJ Virol, Vol. 88, Issue 10, Page 5755-5765, Year 2014
Publish dateMar 12, 2014
AuthorsLindsey J Organtini / Alexander M Makhov / James F Conway / Susan Hafenstein / Steven D Carson /
PubMed AbstractThe coxsackievirus and adenovirus receptor (CAR) has been identified as the cellular receptor for group B coxsackieviruses, including serotype 3 (CVB3). CAR mediates infection by binding to CVB3 and ...The coxsackievirus and adenovirus receptor (CAR) has been identified as the cellular receptor for group B coxsackieviruses, including serotype 3 (CVB3). CAR mediates infection by binding to CVB3 and catalyzing conformational changes in the virus that result in formation of the altered, noninfectious A-particle. Kinetic analyses show that the apparent first-order rate constant for the inactivation of CVB3 by soluble CAR (sCAR) at physiological temperatures varies nonlinearly with sCAR concentration. Cryo-electron microscopy (cryo-EM) reconstruction of the CVB3-CAR complex resulted in a 9.0-Å resolution map that was interpreted with the four available crystal structures of CAR, providing a consensus footprint for the receptor binding site. The analysis of the cryo-EM structure identifies important virus-receptor interactions that are conserved across picornavirus species. These conserved interactions map to variable antigenic sites or structurally conserved regions, suggesting a combination of evolutionary mechanisms for receptor site preservation. The CAR-catalyzed A-particle structure was solved to a 6.6-Å resolution and shows significant rearrangement of internal features and symmetric interactions with the RNA genome.
IMPORTANCE: This report presents new information about receptor use by picornaviruses and highlights the importance of attaining at least an ∼9-Å resolution for the interpretation of cryo-EM complex maps. The analysis of receptor binding elucidates two complementary mechanisms for preservation of the low-affinity (initial) interaction of the receptor and defines the kinetics of receptor-catalyzed conformational change to the A-particle.
External linksJ Virol / PubMed:24623425 / PubMed Central
MethodsEM (single particle)
Resolution9.0 Å
Structure data

5927

3j6l

3j6m

3j6n

3j6o

EMDB-5927, PDB-3j6l, PDB-3j6m, PDB-3j6n, PDB-3j6o:
Kinetic and Structural Analysis of Coxsackievirus B3 Receptor Interactions and Formation of the A-particle
Method: EM (single particle) / Resolution: 9.0 Å

EMDB-5928:
Kinetic and Structural Analysis of Coxsackievirus B3 Receptor Interactions and Formation of the A-particle
Method: EM (single particle) / Resolution: 9.0 Å

Chemicals

ChemComp-SO4:
SULFATE ION / Sulfate

ChemComp-HOH:
WATER / Water

Source
  • homo sapiens (human)
KeywordsCELL ADHESION / Coxsackievirus B3 / CVB3 / CAR

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