Hepatitis E Virus Capsid Structure

Description

Rendered as a non-enveloped, icosahedral hepatitis E virus (HEV) particle, the capsid forms a near-spherical shell with repeating capsomers arranged around 5-fold, 3-fold, and 2-fold symmetry axes. Knobby surface protrusions project radially from the underlying continuous shell, consistent with outward-facing domains of the ORF2 capsid protein that cluster around the icosahedral vertices. Depressions between protrusions create pores and grooves that read as inter-capsomer interfaces, while the overall geometry keeps the genomic RNA sequestered centrally, deep to the protein lattice. Surface topology matters. For teaching virology, this is the view that best anchors how a non-enveloped pathogen presents its antigenic landscape directly to the host, because HEV relies on capsid-mediated attachment and entry rather than a lipid envelope, and neutralizing antibody targets map to exposed loops and protruding domains. Clinically, HEV causes acute hepatitis acquired by fecal-oral transmission (genotypes 1 and 2) or zoonotic foodborne exposure (genotypes 3 and 4), and severe disease in pregnancy remains a defining association that drives screening and outbreak messaging. The rugged outer shell also helps explain environmental persistence and why fecal shedding typically involves non-enveloped virions, even though quasi-enveloped particles circulate in blood. Use this 3D capsid rendering in infectious disease and microbiology curricula when contrasting HEV with enveloped hepatitis viruses, or in hepatology and public health materials discussing transmission routes, serologic testing, and vaccine antigen design based on ORF2 virus-like particles. It also fits cleanly into journal figures or grant proposals illustrating HEV structure-function relationships and candidate neutralizing epitope placement. Anatomical accuracy verified by SciePro's Medical Advisory Board.