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Identification of AXL As a Co-receptor for Human Parvovirus B19 Infection of Human Erythroid Progenitors

Overview
Journal Sci Adv
Specialties Biology
Science
Date 2023 Jan 11
PMID 36630517
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Abstract

Parvovirus B19 (B19V) infects human erythroid progenitor cells (EPCs) and causes several hematological disorders and fetal hydrops. Amino acid (aa) 5-68 of minor capsid protein VP1 (VP1u) is the minimal receptor binding domain for B19V to enter EPCs. Here, we carried out a genome-wide CRISPR-Cas9 guide RNA screen and identified tyrosine protein kinase receptor UFO (AXL) as a proteinaceous receptor for B19V infection of EPCs. gene silencing in ex vivo expanded EPCs remarkably decreased B19V internalization and replication. Additions of the recombinant AXL extracellular domain or a polyclonal antibody against it upon infection efficiently inhibited B19V infection of ex vivo expanded EPCs. Moreover, B19V VP1u interacted with the recombinant AXL extracellular domain in vitro at a relatively high affinity ( = 103 nM). Collectively, we provide evidence that AXL is a co-receptor for B19V infection of EPCs.

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