Journal: Journal of Virology
Article Title: Human antibody targeting of coronavirus spike S2 subunit is associated with protection mediated by Fc effector functions
doi: 10.1128/jvi.01523-25
Figure Lengend Snippet: Broad β-CoV binding of mAb 1871. ( A ) Sequence conservation across the panel of β-CoV SP listed in Fig. 4B shown in a colored representation on SARS-CoV-2 SP PDB ID: 6XR8 . The left panel shows conservation across sarbecovirus sequences, and the right panel shows conservation across β-CoV SP. Pink indicates conserved residues and teal indicates variable residues. Amino acids with insufficient data are shown in yellow. Coloring generated using the Consurf server ( ). Consurf mapping was generated based on sequence homology of the supplied model of SARS-CoV-2 spike, PDB ID: 6XR8 . ( B ) Comparison of apparent binding affinity (K D ) of mAb 1871 to full-length SP (SARS-CoV, SARS-CoV-2, HKU-1, OC43, RatG13, and MERS) shown as red circles and SARS-CoV-2 prefusion stabilized trimer shown as a black circle. K D values generated by global fitting from six different mAb concentrations from a single representative experimental data are depicted. ( C ) Sensograms showing binding kinetics of mAb 1871 to full-length SARS-CoV, SARS-CoV-2, HKU-1, OC43, RatG13, and MERS SP. Red lines represent raw data, and black lines represent global fit.
Article Snippet: His-tagged full-length spike proteins SARS-CoV (Sino Biological, Cat#40634-V08B), SARS-CoV-2, MERS (Sino Biological, Cat#40069-V08B), HKU-1 (Sino Biological, Cat#40606-V08B), OC-43 (Sino Biological, Cat#40607-V08B), HCoV-229E (Sino Biological, Cat#40605-V08B) or S2 subunit SARS-CoV (Sino Biological, Cat#40150-V08B), SARS-CoV-2 (Sino Biological, Cat#40590-V08B), MERS (Sino Biological, Cat#40070-V08B), OC-43 or SARS-CoV-2 full-length prefusion stabilized trimer was loaded onto Ni-NTA biosensors (Sartorius ForteBio) until it achieved a 0.5–0.8 nm signal response or reached a maximum loading time of 800 s. The antigen loading time varied from 50 s to 800 s, resulting in 0.5–0.8 nm signal response depending on antigen ( ).
Techniques: Binding Assay, Sequencing, Generated, Comparison