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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Struct+Mol+Biol 2020 ; 27 (9): 846-854 Nephropedia Template TP
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Neutralizing nanobodies bind SARS-CoV-2 spike RBD and block interaction with ACE2 #MMPMID32661423
Huo J; Le Bas A; Ruza RR; Duyvesteyn HME; Mikolajek H; Malinauskas T; Tan TK; Rijal P; Dumoux M; Ward PN; Ren J; Zhou D; Harrison PJ; Weckener M; Clare DK; Vogirala VK; Radecke J; Moynie L; Zhao Y; Gilbert-Jaramillo J; Knight ML; Tree JA; Buttigieg KR; Coombes N; Elmore MJ; Carroll MW; Carrique L; Shah PNM; James W; Townsend AR; Stuart DI; Owens RJ; Naismith JH
Nat Struct Mol Biol 2020[Sep]; 27 (9): 846-854 PMID32661423show ga
The SARS-CoV-2 virus is more transmissible than previous coronaviruses and causes a more serious illness than influenza. The SARS-CoV-2 receptor binding domain (RBD) of the spike protein binds to the human angiotensin-converting enzyme 2 (ACE2) receptor as a prelude to viral entry into the cell. Using a naive llama single-domain antibody library and PCR-based maturation, we have produced two closely related nanobodies, H11-D4 and H11-H4, that bind RBD (K(D) of 39 and 12 nM, respectively) and block its interaction with ACE2. Single-particle cryo-EM revealed that both nanobodies bind to all three RBDs in the spike trimer. Crystal structures of each nanobody-RBD complex revealed how both nanobodies recognize the same epitope, which partly overlaps with the ACE2 binding surface, explaining the blocking of the RBD-ACE2 interaction. Nanobody-Fc fusions showed neutralizing activity against SARS-CoV-2 (4-6 nM for H11-H4, 18 nM for H11-D4) and additive neutralization with the SARS-CoV-1/2 antibody CR3022.