Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\33912790
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Antib+Ther
2020 ; 3
(2
): 95-100
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Isolation of a human monoclonal antibody specific for the receptor binding domain
of SARS-CoV-2 using a competitive phage biopanning strategy
#MMPMID33912790
Zeng X
; Li L
; Lin J
; Li X
; Liu B
; Kong Y
; Zeng S
; Du J
; Xiao H
; Zhang T
; Zhang S
; Liu J
Antib Ther
2020[Apr]; 3
(2
): 95-100
PMID33912790
show ga
The infection of the novel coronavirus severe acute respiratory syndrome
coronavirus 2 (SARS-CoV-2) has caused more than 200 000 deaths, but no vaccine or
therapeutic monoclonal antibody is currently available. SARS-CoV-2 relies on its
spike protein, in particular the receptor-binding domain (RBD), to bind human
cell receptor angiotensin-converting enzyme 2 (ACE2) for viral entry, and thus
targeting RBD holds the promise for preventing SARS-CoV-2 infection. In this
work, a competitive biopanning strategy of a phage display antibody library was
applied to screen blocking antibodies against RBD. High-affinity antibodies were
enriched after the first round using a standard panning process in which RBD-His
was immobilized as a bait. At the next two rounds, immobilized ACE2-Fc and free
RBD-His were mixed with the enriched phage antibodies. Antibodies binding to RBD
at epitopes different from ACE2-binding site were captured by the immobilized
ACE2-Fc, forming a "sandwich" complex. Only antibodies competed with ACE2 can
bind to the free RBD-His in the supernatant and be subsequently separated by the
nickel-nitrilotriacetic acid magnetic beads. rRBD-15 from the competitive
biopanning of our synthetic antibody library, Lib AB1, was produced as the
full-length IgG1 format. It was proved to competitively block the binding of RBD
to ACE2 and potently inhibit SARS-CoV-2 pseudovirus infection with IC(50) values
of 12 nM. Nevertheless, rRBD-16 from the standard biopanning can only bind to RBD
in vitro, but not have the blocking or neutralization activity. Our strategy can
efficiently isolate the blocking antibodies of RBD, and it would speed up the
discovery of neutralizing antibodies against SARS-CoV-2.