ジャーナル: Proc Natl Acad Sci U S A / 年: 2018 タイトル: Role of enhanced receptor engagement in the evolution of a pandemic acute hemorrhagic conjunctivitis virus. 著者: Jim Baggen / Daniel L Hurdiss / Georg Zocher / Nitesh Mistry / Richard W Roberts / Jasper J Slager / Hongbo Guo / Arno L W van Vliet / Maryam Wahedi / Kimberley Benschop / Erwin Duizer / ...著者: Jim Baggen / Daniel L Hurdiss / Georg Zocher / Nitesh Mistry / Richard W Roberts / Jasper J Slager / Hongbo Guo / Arno L W van Vliet / Maryam Wahedi / Kimberley Benschop / Erwin Duizer / Cornelis A M de Haan / Erik de Vries / José M Casasnovas / Raoul J de Groot / Niklas Arnberg / Thilo Stehle / Neil A Ranson / Hendrik Jan Thibaut / Frank J M van Kuppeveld / 要旨: Acute hemorrhagic conjunctivitis (AHC) is a painful, contagious eye disease, with millions of cases in the last decades. Coxsackievirus A24 (CV-A24) was not originally associated with human disease, ...Acute hemorrhagic conjunctivitis (AHC) is a painful, contagious eye disease, with millions of cases in the last decades. Coxsackievirus A24 (CV-A24) was not originally associated with human disease, but in 1970 a pathogenic "variant" (CV-A24v) emerged, which is now the main cause of AHC. Initially, this variant circulated only in Southeast Asia, but it later spread worldwide, accounting for numerous AHC outbreaks and two pandemics. While both CV-A24 variant and nonvariant strains still circulate in humans, only variant strains cause AHC for reasons that are yet unknown. Since receptors are important determinants of viral tropism, we set out to map the CV-A24 receptor repertoire and establish whether changes in receptor preference have led to the increased pathogenicity and rapid spread of CV-A24v. Here, we identify ICAM-1 as an essential receptor for both AHC-causing and non-AHC strains. We provide a high-resolution cryo-EM structure of a virus-ICAM-1 complex, which revealed critical ICAM-1-binding residues. These data could help identify a possible conserved mode of receptor engagement among ICAM-1-binding enteroviruses and rhinoviruses. Moreover, we identify a single capsid substitution that has been adopted by all pandemic CV-A24v strains and we reveal that this adaptation enhances the capacity of CV-A24v to bind sialic acid. Our data elucidate the CV-A24v receptor repertoire and point to a role of enhanced receptor engagement in the adaptation to the eye, possibly enabling pandemic spread.
凍結剤: ETHANE / チャンバー内湿度: 80 % / チャンバー内温度: 8 K / 装置: LEICA EM GP 詳細: On-grid binding of the receptor was performed by applying 3 microliters of ICAM-1 (9.85 mg/ml) to the pre-blotted, virus-containing grid, and leaving for 30 seconds before blotting and freezing.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 検出モード: INTEGRATING / 撮影したグリッド数: 1 / 実像数: 2652 / 平均露光時間: 1.5 sec. / 平均電子線量: 60.0 e/Å2