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I03-Macromolecular Crystallography	Rapid escape of new SARS-CoV-2 Omicron variants from BA.2 directed antibody responses Aiste Dijokaite-Guraliuc , Raksha Das , Daming Zhou , Helen M. Ginn , Chang Liu , Helen M. E. Duyvesteyn , Jiandong Huo , Rungtiwa Nutalai , Piyada Supasa , Muneeswaran Selvaraj , Thushan I. De Silva , Megan Plowright , Thomas A. H. Newman , Hailey Hornsby , Alexander J. Mentzer , Donal Skelly , Thomas G. Ritter , Nigel Temperton , Paul Klenerman , Eleanor Barnes , Susanna J. Dunachie , Cornelius Roemer , Thomas P. Peacock , Neil G. Paterson , Mark A. Williams , David R. Hall , Elizabeth E. Fry , Juthathip Mongkolsapaya , Jingshan Ren , David I. Stuart , Gavin R. Screaton Cell Reports DOI: 10.1016/j.celrep.2023.112271 Diamond Proposal Number(s): [27009] Open Access Show Abstract ▼ Abstract: In November 2021 Omicron BA.1, containing a raft of new spike mutations emerged and quickly spread globally. Intense selection pressure to escape the antibody response produced by vaccines or SARS-CoV-2 infection then led to a rapid succession of Omicron sub-lineages with waves of BA.2 then BA.4/5 infection. Recently, many variants have emerged such as BQ.1 and XBB, which carry up to 8 additional RBD amino-acid substitutions compared to BA.2. We describe a panel of 25 potent mAbs generated from vaccinees suffering BA.2 breakthrough infections. Epitope mapping shows potent mAb binding shifting to 3 clusters, 2 corresponding to early-pandemic binding hotspots. The RBD mutations in recent variants map close to these binding sites and knock out or severely knock down neutralization activity of all but 1 potent mAb. This recent mAb escape corresponds with large falls in neutralization titre of vaccine or BA.1, BA.2 or BA.4/5 immune serum.	Mar 2023

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