RasGAP and Crk bind Anaplasma phagocytophilum effector AteA at tyrosine-phosphorylated EPLYA motifs.

AteA from Anaplasma phagocytophilum is tyrosine-phosphorylated at EPLYA motifs and preferentially binds tick SH2 proteins RasGAP and Crk during tick infection.

• Why it matters: Vector survival depends on how A. phagocytophilum effectors interface with tick signaling, but AteA’s tick targets and activation mechanism were unknown.
• What they did: The study tested AteA interactions with tick cell proteins and activation by non-receptor tyrosine kinases Src and Abl, using protein pull-down assays and infection/tick-cell contexts.
• The result: Phosphorylated EPLYA motifs promote preferential RasGAP and Crk binding, implying AteA engages interconnected SH2-linked signaling networks in the arthropod vector.