RE: LFT Omicron detection3 Dec 2021 18:00
@Monkshood, I had a quick look through my notes and thought this might be useful for others as well:
Size of Affimers and Antibodies
". A large binding surface, obtained through two 9 amino acid loops, enables Affimer proteins to bind with high affinity and exquisite selectivity. At 12-14 kDa, Affimer® molecules are around 10 times smaller than antibodies, giving several performances advantages such as increased packing density on surfaces and greater proximity to sensor surfaces." [Avacta website]
Spike Protein Mutations
"Since the Affimer reagents we use in Avacta’s range of SARS-CoV-2 tests do not bind in the region of the spike protein where the dominant mutations appear, we do not anticipate that the performance of the tests will be affected." [Avacta website]
S protein homology
Although Sars-Cov-1 (responsible for ‘01-‘04 SARS outbreak) is also a coronavirus, the Sars-CoV-2 (covid-19) has some distinguishing features. The Spike (S) protein (RBD region) found on both virus surfaces, has only 66% homology between the two strains. The Nucleocapsid (N) protein is significantly higher at 90%.
GLA