They all fuse and melt cells like “chewing gum”.. given the right conditions. Here is XFG with ACE2 SLCA619 TMPRSS2. I guess the question here is IF it does this in lots of different conditions like pre-Omicrons. Conditions you would observe in the lung for instance.
ORF1a:L3338F has been one of the more common NSP5 muts. Don't think it's a resistance mut. I'd guess it's a relatively inconsequential site. NSP5 still a great target. We need drugs targeting other proteins as well. Promising M-directed drugs in pipeline.
...to the recent discovery of two promising M-directed small molecules that prevent the short-to-long transition of M, which is essential for viral assembly. Both studies were released in the March 26 edition of Nature. nature.com/articles/s41586-0…nature.com/articles/s41586-0…
I’m also not convinced that Paxlovid is deployed enough and used early enough to put much evolutionary pressure on viral transmission.
But I’m happy that so far SARS-CoV-2 has not evolved Paxlovid resistance on a large scale.
XFG.3.13 Orf1a:L3338F. I'm old enough to remember when NSP5 was highly conserved and a great target for antivirals. First Paxlovid mute ? @LongDesertTrain@guptalab
While attack on conserved epitopes provides a ready mechanism for a broad spectrum antibody, it may NOT be easy to find such mechanism for a mutant capable of evading polyclonal antibodies. Immune suppression is NOT likely to occur before infection.
I originally thought the 69/70 del helped the virus evade polyclonal Abs. In reality, it mainly impairs monoclonals like Ab 4A8 that target the NTD, which IMO likely explains why studies using polyclonal sera might not detect its specific immune-evasive impact.
But the 69/70 deletion is still necessary to minimise sensitivity to polyclonals convalescent or vaccinated. It’s another optimal tradeoff mute like others selected downstream. Significantly ups binding whilst minimising its Ag signature.
Yesterday we celebrated the achievements of our postdocs @hemanta_datta, Jonathan and Rachel, and thanked them for advancing #GuptaLab research @CCLRI@ClevelandClinic @CleClinicKids during #NPAW2024 🎊🥳 We also bade farewell to @RileyK126 and wish her the best in PA school 👍🏽💪🏽
Bidding farewell to our phenomenal @CCLRI summer students Afreen @KentState and Allison @BostonCollege, I couldn’t think of a better gift than @kkariko’s beautiful autobiography. I hope you will enjoy and be inspired by it. So proud of you! #GuptaLab#WomenInSTEM#BCells