METHOD FOR DETECTING ANTI-SARS-COV-2 SPIKE (S) IMMUNOGLOBULINS
Disclosed are methods for detecting if a biological sample (e.g., serum, blood, plasma) contains antibodies against SARS-CoV-2 S glycoproteins comprising: (i) providing a surface coated with a SARS-CoV-2 S glycoprotein; (ii) exposing the surface to the biological sample; (iii) exposing the surface to a secondary antibody; and (iv) detecting the secondary antibody that is bound to the surface; wherein the biological sample contains antibodies that bind to the SARS-CoV-2 S glycoprotein if secondary antibody is detected.
1 . A method for determining if a biological sample contains antibodies that bind to the SARS-CoV-2 Spike (S) glycoprotein, comprising:
(i) providing a surface coated with a SARS-CoV-2 S glycoprotein;
(ii) exposing the surface to the biological sample;
(iii) exposing the surface to a secondary antibody; and
(iv) detecting the secondary antibody that is bound to the surface;
wherein the biological sample contains antibodies that bind to the SARS-CoV-2 S glycoprotein if the secondary antibody is detected.
2 . The method of claim 1 , wherein the SARS-CoV-2 S glycoprotein has at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, at least 85%, at least 86%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identity to a polypeptide of any one of SEQ ID NOS: 2, 4, 38, 41, 44, 48, 51, 54, 58, 61, 63, 65, 67, 73, 75, 78, 79, 82, 83, 85, 106, 108, 89, and 110, 112-115, 132, 133, 114, 138, 141, 144, 147, 151, 153, 156, 158, 174, 175, 176, 181-184, 186, 188, 190, 195, 217-228, 233-236, 243, 255-264, 273-280, 283, 284, 287, 288, 291, 292, and 294, 296, 298, 300, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 236, 328, 329, 330, 331, 332 and 333.
3 . The method of claim 1 , wherein the SARS-CoV-2 S glycoprotein has an inactive furin cleavage site.
4 . The method of claim 3 , wherein the SARS-CoV-2 S glycoprotein has an inactive furin cleavage site having the amino acid sequence of QQAQ (SEQ ID NO: 7).
5 . The method of claim 1 , wherein amino acids 973 and 974 of the SARS-CoV-2 S glycoprotein are proline, as compared to a wild-type SARS-CoV-2 S glycoprotein having the amino acid sequence of SEQ ID NO: 2.
6 . The method of claim 1 , wherein the antibodies that bind to the SARS-CoV-2 S glycoprotein are IgG1 or IgG2 or IgG3 or IgG4.
7 . The method of claim 6 , wherein the antibodies that bind to the SARS-CoV-2 S glycoprotein are IgG3.
8 . The method of claim 6 , wherein the antibodies that bind to the SARS-CoV-2 S glycoprotein are IgG4.
9 . The method of claim 1 , wherein the secondary antibody is selected from the group consisting of an anti-human IgG antibody, an anti-human IgG1 antibody, an anti-human IgG2 antibody, an anti-human IgG3 antibody and an anti-human IgG4 antibody.
10 . The method of claim 1 , wherein the SARS-CoV-2 S glycoprotein is selected from a SARS-CoV-2 virus or a variant of SARS-CoV-2 or a subvariant of a variant of SARS-CoV-2.
11 . The method of claim 10 , wherein the variant of SARS-CoV-2 is a B.1.1.7 SARS-CoV-2 strain; a B.1.351 SARS-CoV-2 strain; a P.1 SARS-CoV-2 strain; a Cal.20C SARS-CoV-2 strain; a B.1.617.2 SARS-CoV-2 strain; a B.1.525 SARS-CoV-2 strain; a B.1.526 SARS-CoV-2 strain; a B.1.617.1 SARS-CoV-2 strain; a C.37 SARS-CoV-2 strain; a B.1.621 SARS-CoV-2 strain; or a B.1.1.529 SARS-CoV-2 strain.
12 . The method of claim 10 , wherein the variant of SARS-CoV-2 is a subvariant of a B.1.1.7 SARS-CoV-2 strain; a B.1.351 SARS-CoV-2 strain; a P.1 SARS-CoV-2 strain; a Cal.20C SARS-CoV-2 strain; a B.1.617.2 SARS-CoV-2 strain; a B.1.525 SARS-CoV-2 strain; a B.1.526 SARS-CoV-2 strain; a B.1.617.1 SARS-CoV-2 strain; a C.37 SARS-CoV-2 strain; a B.1.621 SARS-CoV-2 strain; or a B.1.1.529 SARS-CoV-2 strain.
13 . The method of claim 1 , wherein the SARS-CoV-2 S glycoprotein has at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, at least 85%, at least 86%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identity to any one of SEQ ID NOS: 2, 4, 38, 41, 44, 48, 51, 54, 58, 61, 63, 65, 67, 73, 75, 78, 79, 82, 83, 85, 106, 108, 89, and 110, 112-115, 132, 133, 114, 138, 141, 144, 147, 151, 153, 156, 158, 174, 175, 176, 181-184, 186, 188, 190, 195, 217-228, 233-236, 243, 255-264, 273-280, 283, 284, 287, 288, 291, 292, and 294, 296, 298, 300, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 236, 328, 329, 330, 331, 332 and 333.
14 . The method of claim 1 , wherein the SARS-CoV-2 S glycoprotein has at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, at least 85%, at least 86%, at least 87%, at least 88%, at least 89%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99%, or 100% identity to to a SARS-CoV-2 S glycoprotein from a SARS-CoV-2 S omicron variant selected from the group consisting of: BA.1, BA.2.12.1, BA.2, BA.3, BA.4, BA.5, XBB.1.5, XBB.2.3, and XBB.1.16, EG.5.1, JN.1, BQ.1.1, BF.7.
15 . The method of claim 1 , wherein the secondary antibody is attached to a tag.
16 . The method of claim 15 , wherein the tag is horseradish peroxidase.
17 . The method of claim 1 , wherein the biological sample is serum, plasma, blood, saliva, a nasopharyngeal swab, or mucus.
18 . The method of claim 1 , wherein the biological sample is from a patient that has previously had COVID-19.
19 . The method of claim 1 , wherein the biological sample is from a patient who has been administered an immunogenic composition against a SARS-CoV-2 virus or a variant thereof.
20 . The method of claim 1 , wherein the SARS-CoV-2 S glycoprotein includes the transmembrane domain.