Fig. 3. Crystal structures of TLR2-TLR1/6 heterodimers induced by binding of triacyl and diacyl lipopeptides.
(a) Lipid-binding pocket in the TLR2-TLR1-Pam3CSK4 complex. The structures of the TLRs are dissected to reveal the shape of the lipid pocket. (b) Lipid-binding pocket in the TLR2-TLR6-Pam2CSK4 complex. The putative lipid channel of TLR6 is blocked by phenylalanines F343 and F365. (c) Summary of the lipopeptide patterns recognized by the TLR1-TLR2 and TLR2-TLR6 heterodimers. (Kang and Lee, 2011).