申请人:Pfizer Healthcare Ireland
公开号:US20210147576A1
公开(公告)日:2021-05-20
The present invention relates to a polypeptide comprising 7 β-strands A, B, C, D, E, F, and G sequentially connected together by connecting chains of amino acids, and a first α-helix sequentially located on the EF chain between β-strands E and F, wherein the β-strands are arranged so as to form a first β-sheet comprising β-strands A, B, D, and E, and a second β-sheet comprising β-strands C, F and G, said first and second β-sheets being covalently bonded together so as to form a first Ig domain; wherein the EF chain between β-strands E and F comprises the sequence X
1
-X
2
-X
3
-X
4
-K
5
H
6
(SEQ ID NO:98), and X
1
, X
3
and X
4
are each independently any amino acid residue, characterized in that X
2
is selected from the group consisting of A, G, I, V, L, R, S, T, Q, P, N, M, H, W, and pharmaceutically acceptable salts, stereoisomers, tautomers, solvates, and prodrugs thereof