RBD conjugate vaccine with a built-in TLR1/2 agonist is highly immunogenic against SARS-CoV-2 and variants of concern.
Chem Commun (Camb)
; 58(13): 2120-2123, 2022 Feb 10.
Article
in English
| MEDLINE | ID: covidwho-1639577
ABSTRACT
The coronavirus 2019 (COVID-19) pandemic is causing serious impacts in the world, and safe and effective vaccines and medicines are the best methods to combat the disease. The receptor-binding domain (RBD) of the SARS-CoV-2 spike protein plays a key role in interacting with the angiotensin-converting enzyme 2 (ACE2) receptor, and is regarded as an important target of vaccines. Herein, we constructed the adjuvant-protein conjugate Pam3CSK4-RBD as a vaccine candidate, in which the N-terminal of the RBD was site-selectively oxidized by transamination and conjugated with the TLR1/2 agonist Pam3CSK4. This demonstrated that the conjugation of Pam3CSK4 significantly enhanced the anti-RBD antibody response and cellular response. In addition, sera from the Pam3CSK4-RBD immunized group efficiently inhibited the binding of the RBD to ACE2 and protected cells from SARS-CoV-2 and four variants of concern (alpha, beta, gamma and delta), indicating that this adjuvant strategy could be one of the effective means for protein vaccine development.
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Vaccines, Conjugate
/
Lipopeptides
/
Spike Glycoprotein, Coronavirus
/
SARS-CoV-2
/
COVID-19
Topics:
Vaccines
/
Variants
Limits:
Animals
/
Female
/
Humans
Language:
English
Journal:
Chem Commun (Camb)
Journal subject:
Chemistry
Year:
2022
Document Type:
Article
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