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Toll-like receptors bind and become activated by different ligands, which, in turn, are located on different types of organisms or structures. They also have different adapters to respond to activation and are located sometimes at the cell surface and sometimes to internal cell compartments . [ 26 ]
The first function described for TLR4 was the recognition of exogenous molecules from pathogens (PAMPs), in particular LPS molecules from gram-negative bacteria. [13] As pattern recognition receptor, TLR4 plays a fundamental role in pathogen recognition and activation of innate immunity which is the first line of defense against invading micro-organisms.
Toll-like receptor 2 also known as TLR2 is a protein that in humans is encoded by the TLR2 gene. [5] TLR2 has also been designated as CD282 ( cluster of differentiation 282). TLR2 is one of the toll-like receptors and plays a role in the immune system .
Toll-like receptor 1 (TLR1) is a member of the toll-like receptor (TLR) family of pattern recognition receptors (PRRs) that form the cornerstone of the innate immune system. [ 5 ] [ 6 ] [ 7 ] TLR1 recognizes bacterial lipoproteins and glycolipids in complex with TLR2 .
Toll-like receptor 9 is a protein that in humans is encoded by the TLR9 gene. [5] TLR9 has also been designated as CD289 ( cluster of differentiation 289). It is a member of the toll-like receptor (TLR) family.
Toll-like receptor 3 (TLR3) also known as CD283 (cluster of differentiation 283) is a protein that in humans is encoded by the TLR3 gene. [5] TLR3 is a member of the toll-like receptor family of pattern recognition receptors of the innate immune system .
TLR6 is a transmembrane protein, member of toll-like receptor family, which belongs to the pattern recognition receptor (PRR) family. TLR6 acts in a heterodimer form with toll-like receptor 2 (TLR2). Its ligands include multiple diacyl lipopeptides derived from gram-positive bacteria and mycoplasma and several
The ability of the immune system to recognize molecules that are broadly shared by pathogens is, in part, due to the presence of immune receptors called toll-like receptors (TLRs) that are expressed on the membranes of leukocytes including dendritic cells, macrophages, natural killer cells, cells of the adaptive immunity (T and B lymphocytes ...