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© by The Society for Leukocyte Biology
Journal of Leukocyte Biology, doi:10.1189/jlb.1206750

Received for publication December 22, 2006.
Revised March 1, 2007.
Accepted for publication March 20, 2007.

Article

The Troll in Toll: Mal and Tram as bridges for TLR2 and TLR4 signaling

Frederick J. Sheedy and Luke A. J. O’Neill @

School of Biochemistry and Immunology, Trinity College, Dublin, Ireland

@ To whom correspondence should be addressed. E-mail: sheedyf{at}tcd.ie.


  Abstract

Signaling by two of the most important bacteria-sensing TLRs, TLR2 and TLR4, involves two adaptor proteins, MyD88 adaptor-like (Mal) and Toll/IL-1 receptor translation initiation region (TIR) domain-containing adaptor-inducing IFN-{beta} (Trif)-related adaptor molecule (TRAM). Recently, new insights into the functioning of these two adapters have emerged. Mal is required by both TLRs to act as a bridge to recruit the adaptor MyD88, leading ultimately to NF-{kappa}B activation. Similarly, TRAM acts as a bridge to recruit TRIF to the TLR4 complex, leading to activation of the transcription factor IFN regulatory factor 3. Consistent with Mal and TRAM being key points of control, recent evidence suggests that they are subject to regulation by phosphorylation. Further, a variant in Mal in humans has been found to protect against multiple infectious diseases. Finally, another TIR domain-containing adaptor, sterile {alpha} and HEAT/armadillo motif protein, has been shown to act as an inhibitor of TRIF-dependent signaling. These recent discoveries add to the complexity of TLR signaling and highlight specific control mechanisms for TLR2 and TLR4 signaling.

Key Words: Toll-like receptors • signal transduction • TLR adapters • SARM • innate immunity • inflammation




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