TLR2 agonistic small molecules: Detailed structure-activity relationship, applications, and future prospects

Arshpreet Kaur, Deepender Kaushik, Sakshi Piplani, Surinder K. Mehta, Nikolai Petrovsky, Deepak B. Salunke

Research output: Contribution to journalReview articlepeer-review

Abstract

Toll-like receptors (TLRs) are the pattern recognition receptors (PRRs) that recognize pathogen-associated molecular patterns (PAMPs) in microbial species. Among the various TLRs, TLR2 has a special place due to its ability to sense the widest repertoire of PAMPs owing to its heterodimerization with either TLR1 or TLR6, broadening its ligand diversity against pathogens. Various scaffolds are reported to activate TLR2, which include naturally occurring lipoproteins, synthetic lipopeptides, and small heterocyclic molecules. We described a detailed SAR in TLR2 agonistic scaffolds and also covered the design and chemistry for the conjugation of TLR2 agonists to antigens, carbohydrates, polymers, and fluorophores. The approaches involved in delivery of TLR2 agonists such as lipidation of antigen, conjugation to polymers, phosphonic acids, and other linkers to achieve surface adsorption, liposomal formulation, and encapsulating nanoparticles are elaborated. The crystal structure analysis and computational modeling are also included with the structural features that facilitate TLR2 activation.

Original languageEnglish
Pages (from-to)233-278
Number of pages46
JournalJournal of Medicinal Chemistry
Volume64
Issue number1
DOIs
Publication statusPublished - 14 Jan 2021

Keywords

  • Polyacrylamide
  • Lipids
  • Peptides and proteins
  • Agonists
  • Monomers

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