Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

We report severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike ΔH69/V70 in multiple independent lineages, often occurring after acquisition of receptor binding motif replacements such as N439K and Y453F, known to increase binding affinity to the ACE2 receptor and confer antibody escape. In vitro, we show that, although ΔH69/V70 itself is not an antibody evasion mechanism, it increases infectivity associated with enhanced incorporation of cleaved spike into virions. ΔH69/V70 is able to partially rescue infectivity of spike proteins that have acquired N439K and Y453F escape mutations by increased spike incorporation. In addition, replacement of the H69 and V70 residues in the Alpha variant B.1.1.7 spike (where ΔH69/V70 occurs naturally) impairs spike incorporation and entry efficiency of the B.1.1.7 spike pseudotyped virus. Alpha variant B.1.1.7 spike mediates faster kinetics of cell-cell fusion than wild-type Wuhan-1 D614G, dependent on ΔH69/V70. Therefore, as ΔH69/V70 compensates for immune escape mutations that impair infectivity, continued surveillance for deletions with functional effects is warranted.

Original publication

DOI

10.1016/j.celrep.2021.109292

Type

Journal article

Journal

Cell Rep

Publication Date

29/06/2021

Volume

35

Keywords

Alpha variant, B.1.1.7, COVID-19, SARS-CoV-2, antibody escape, deletion, infectivity, neutralizing antibodies, resistance, spike mutation, Animals, Antibodies, Neutralizing, Antibodies, Viral, COVID-19, Cell Line, Chlorocebus aethiops, HEK293 Cells, Humans, Immune Evasion, Mutation, Pandemics, Phylogeny, Protein Binding, Recurrence, SARS-CoV-2, Spike Glycoprotein, Coronavirus, Vero Cells