Kinetic and structural analysis of coxsackievirus b3 receptor interactions and formation of the a-particle.Organtini, L.J., Makhov, A.M., Conway, J.F., Hafenstein, S., Carson, S.D.
(2014) J Virol 88: 5755-5765
- PubMed: 24623425
- DOI: https://doi.org/10.1128/JVI.00299-14
- Primary Citation of Related Structures:
3J6L, 3J6M, 3J6N, 3J6O
- PubMed Abstract:
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.
Department of Medicine, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania, USA.