Identification of a novel conserved signaling motif in CD200 receptor required for its inhibitory function

Laura M. Timmerman, J. Fréderique De Graaf, Nikolaos Satravelas, Çan Kesmir, Linde Meyaard, Michiel Van Der Vlist*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The inhibitory signaling of CD200 receptor 1 (CD200R) has been attributed to its NPxY signaling motif. However, NPxY-motifs are present in multiple protein families and are mostly known to mediate protein trafficking between subcellular locations rather than signaling. Therefore, we investigated whether additional motifs specify the inhibitory function of CD200R. We performed phylogenetic analysis of the intracellular domain of CD200R in mammals, birds, bony fish, amphibians and reptiles. Indeed, the tyrosine of the NPxY-motif is fully conserved across species, in line with its central role in CD200R signaling. In contrast, P295 of the NPxY-motif is not conserved. Instead, a conserved stretch of negatively charged amino acids, EEDE279, and two conserved residues P285 and K292 in the flanking region prior to the NPxY-motif are required for CD200R mediated inhibition of p-Erk, pAkt308, p-Akt473, p-rpS6 and LPS-induced IL-8 secretion. Altogether, we show that instead of the more common NPxY-motif, CD200R signaling can be assigned to a unique signaling motif in mammals defined by: EEDExxPYxxYxxKxNxxY.

Original languageEnglish
Article numbere0244770
Number of pages16
JournalPLoS ONE
Volume16
Issue number3
DOIs
Publication statusPublished - 29 Mar 2021

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