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Department of Molecular Biology, Genentech, Inc., San Francisco, CA 94080
Human Toll-like receptor 2 (TLR2) is a signaling receptor that
responds to LPS and activates NF-
B. Here, we investigate further the
events triggered by TLR2 in response to LPS. We show that TLR2
associates with the high-affinity LPS binding protein membrane CD14 to
serve as an LPS receptor complex, and that LPS treatment enhances the
oligomerization of TLR2. Concomitant with receptor oligomerization, the
IL-1R-associated kinase (IRAK) is recruited to the TLR2 complex.
Intracellular deletion variants of TLR2 lacking C-terminal 13 or 141 aa
fail to recruit IRAK, which is consistent with the inability of these
mutants to transmit LPS cellular signaling. Moreover, both deletion
mutants could still form complexes with wild-type TLR2 and act in a
dominant-negative (DN) fashion to block TLR2-mediated signal
transduction. DN constructs of myeloid differentiation protein, IRAK,
TNF receptor-associated factor 6, and NF-
B-inducing kinase, when
coexpressed with TLR2, abrogate TLR2-mediated NF-
B activation. These
results reveal a conserved signaling pathway for TLR2 and IL-1Rs and
suggest a molecular mechanism for the inhibition of TLR2 by DN
variants.
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