CLIC and Membrane Wound Repair Pathways Enable Pandemic Norovirus Entry and Infection

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Feb 28

PMID 36854760

Authors

B Vijayalakshmi Ayyar

Khalil Ettayebi

Wilhelm Salmen

Umesh C Karandikar

Frederick H Neill

Victoria R Tenge

Sue E Crawford

Erhard Bieberich

B V Venkataram Prasad

Robert L Atmar

Mary K Estes

Affiliations

Soon will be listed here.

Abstract

Globally, most cases of gastroenteritis are caused by pandemic GII.4 human norovirus (HuNoV) strains with no approved therapies or vaccines available. The cellular pathways that these strains exploit for cell entry and internalization are unknown. Here, using nontransformed human jejunal enteroids (HIEs) that recapitulate the physiology of the gastrointestinal tract, we show that infectious GII.4 virions and virus-like particles are endocytosed using a unique combination of endosomal acidification-dependent clathrin-independent carriers (CLIC), acid sphingomyelinase (ASM)-mediated lysosomal exocytosis, and membrane wound repair pathways. We found that besides the known interaction of the viral capsid Protruding (P) domain with host glycans, the Shell (S) domain interacts with both galectin-3 (gal-3) and apoptosis-linked gene 2-interacting protein X (ALIX), to orchestrate GII.4 cell entry. Recognition of the viral and cellular determinants regulating HuNoV entry provides insight into the infection process of a non-enveloped virus highlighting unique pathways and targets for developing effective therapeutics.

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