scholarly journals Broad specificity of immune helminth scFv library to identify monoclonal antibodies targeting Strongyloides

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anizah Rahumatullah ◽  
Dinesh Balachandra ◽  
Rahmah Noordin ◽  
Zamrina Baharudeen ◽  
Yee Ying Lim ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Chemical Properties ◽  
Strongyloides Stercoralis ◽  
Phage Display Library ◽  
Effective Control ◽  
Antibody Library ◽  
Antibody Phage ◽  
Scfv Library ◽  
Antibody Phage Display ◽  
Immune Antibody

AbstractAntibodies have different chemical properties capable of targeting a diverse nature of antigens. Traditionally, immune antibody libraries are perceived to be disease-specific with a skewed repertoire. The complexity during the generation of a combinatorial antibody library allows for a skewed but diverse repertoire to be generated. Strongyloides stercoralis is a parasite that causes strongyloidiasis, a potentially life-threatening disease with a complex diagnosis that impedes effective control and treatment of the disease. This study describes the isolation of monoclonal antibodies against S. stercoralis NIE recombinant protein using an immune antibody phage display library derived from lymphatic filaria-infected individuals. The isolated antibody clones showed both lambda and kappa light chains gene usage, with diverse amino acid distributions. Structural analysis showed that electropositivity and the interface area could determine the binding affinity of the clones with NIE. The successful identification of S. stercoralis antibodies from the filarial immune library highlights the breadth of antibody gene diversification in an immune antibody library that can be applied for closely related infections.

scholarly journals Isolation of and Characterization of Neutralizing Antibodies to Covid-19 from a Large Human Naïve scFv Phage Display Library

2020 ◽  
Author(s):  
Andy Q. Yuan ◽  
Likun Zhao ◽  
Lili Bai ◽  
Qingwu Meng ◽  
Zhenguo Wen ◽  
...  
Keyword(s):  
Phage Display ◽  
Neutralizing Antibodies ◽  
Epitope Mapping ◽  
Neutralization Assay ◽  
Phage Display Library ◽  
Antibody Library ◽  
Antibody Phage ◽  
Antibody Phage Display ◽  
Human Receptor

AbstractSARS-CoV-2 (Covid-19) has caused currently ongoing global plague and imposed great challenges to health managing systems all over the world, with millions of infections and hundreds of thousands of deaths. In addition to racing to develop vaccines, neutralizing antibodies (nAbs) to this virus have been extensively sought and are expected to provide another prevention and therapy tool against this frantic pandemic. To offer fast isolation and shortened early development, a large human naïve phage display antibody library, was built and used to screen specific nAbs to the receptor-binding domain, RBD, the key for Covid-19 virus entry through a human receptor, ACE2. The obtained RBD-specific antibodies were characterized by epitope mapping, FACS and neutralization assay. Some of the antibodies demonstrated spike-neutralizing property and ACE2-competitiveness. Our work proved that RBD-specific neutralizing binders from human naïve antibody phage display library are promising candidates to for further Covid-19 therapeutics development.

scholarly journals Extremely potent monoclonal antibodies neutralize Omicron and other SARS-CoV-2 variants

2022 ◽  
Author(s):  
Zhaochun Chen ◽  
Peng Zhang ◽  
Yumiko Matsuoka ◽  
Yaroslav Tsybovsky ◽  
Kamille West ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Neutralizing Antibodies ◽  
Spike Protein ◽  
Structural Basis ◽  
Hamster Model ◽  
Golden Syrian Hamster ◽  
Phage Display Libraries ◽  
Antibody Phage ◽  
Antibody Phage Display ◽  
Early Isolate

The ongoing coronavirus disease 2019 (COVID-19) pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has triggered a devastating global health, social and economic crisis. The RNA nature and broad circulation of this virus facilitate the accumulation of mutations, leading to the continuous emergence of variants of concern with increased transmissibility or pathogenicity1. This poses a major challenge to the effectiveness of current vaccines and therapeutic antibodies1,2. Thus, there is an urgent need for effective therapeutic and preventive measures with a broad spectrum of action, especially against variants with an unparalleled number of mutations such as the recently emerged Omicron variant, which is rapidly spreading across the globe3. Here, we used combinatorial antibody phage-display libraries from convalescent COVID-19 patients to generate monoclonal antibodies against the receptor-binding domain of the SARS-CoV-2 spike protein with ultrapotent neutralizing activity. One such antibody, NE12, neutralizes an early isolate, the WA-1 strain, as well as the Alpha and Delta variants with half-maximal inhibitory concentrations at picomolar level. A second antibody, NA8, has an unusual breadth of neutralization, with picomolar activity against both the Beta and Omicron variants. The prophylactic and therapeutic efficacy of NE12 and NA8 was confirmed in preclinical studies in the golden Syrian hamster model. Analysis by cryo-EM illustrated the structural basis for the neutralization properties of NE12 and NA8. Potent and broadly neutralizing antibodies against conserved regions of the SARS-CoV-2 spike protein may play a key role against future variants of concern that evade immune control.

Single chain variable fragment antibodies against Shiga toxins isolated from a human antibody phage display library

Vaccine ◽  
2011 ◽  
Vol 29 (33) ◽  
pp. 5340-5346 ◽  
Author(s):  
Paola Neri ◽  
Naoko Shigemori ◽  
Susumu Hamada-Tsutsumi ◽  
Kentaro Tsukamoto ◽  
Hideyuki Arimitsu ◽  
...  
Keyword(s):  
Phage Display ◽  
Phage Display Library ◽  
Human Antibody ◽  
Single Chain Variable Fragment ◽  
Single Chain ◽  
Shiga Toxins ◽  
Antibody Phage ◽  
Antibody Phage Display

scholarly journals Neutralizing Antibodies of Botulinum Neurotoxin Serotype A Screened from a Fully Synthetic Human Antibody Phage Display Library

2009 ◽  
Vol 14 (8) ◽  
pp. 991-998 ◽  
Author(s):  
Rui Yu ◽  
Shuang Wang ◽  
Yun-zhou Yu ◽  
Wei-shi Du ◽  
Fang Yang ◽  
...  
Keyword(s):  
Phage Display ◽  
Neutralizing Antibodies ◽  
Botulinum Neurotoxin ◽  
Phage Display Library ◽  
Human Antibody ◽  
Serotype A ◽  
Antibody Phage ◽  
Antibody Phage Display ◽  
Botulinum Neurotoxin Serotype A

The botulinum neurotoxins (BoNTs) produced by Clostridium botulinum are the most poisonous protein substances known. The neutralizing antibodies against botulinum neurotoxin can effectively prevent and cure the toxicosis. Using purified Hc fragments of botulinum neurotoxin serotype A (BoNT/A-Hc) as antigen, 2 specific neutralizing antibodies mapping different epitopes were selected from a fully synthetic human antibody library. The 2 antibodies can effectively inhibit the binding between BoNT/A-Hc and differentiated PC-12 cells in vitro, and the neutralization was evaluated in vivo. Although no single mAb completely protected mice from toxin, they both could prolong time to death when challenged with 20 LD 50s (50% lethal doses) of BoNT/A. When used together, the mAbs completely neutralized 1000 LD50s/mg Ab, suggesting their high neutralizing potency in vivo . The results would lead to further production of neutralizing antibody drugs against BoNT/A. It also proved that it was a quick method to obtain human therapeutic antibodies by selecting from the fully synthetic human antibody phage display library. ( Journal of Biomolecular Screening 2009:991-998)

Sign in / Sign up

Export Citation Format

Share Document