Neurotrophin binding to p75NTR leads to recruitment of TRAF6. This protein is an E3 ubiquitin ligase, which, together with an E2 Ubiquitin conjugating enzyme, mediates the assembly of lysine 63-linked polyubiquitin chains and their attachment to a lysine of a substrate protein. Activation of IRAK1 promotes recruitment of TRAF6. TRAF6 is able to bind to p75NTR (juxtamembrane region, residues 113-128), IRAK1 (N-terminal residues 1-198 and C-terminal residues 523-618), and MYD88. It might be recruited through the MYD88:IRAK1 complex.