Connecting the Dots: AMOG/β2 and Its Elusive Adhesion Partner in CNS

AMOG/β2, the β2 isoform of the sodium pump (Na⁺,K⁺-ATPase), functions as an adhesion molecule on glial cells, mediating critical neuron–astrocyte interactions during central nervous system (CNS) development. Despite its established role in glial adhesion, the neuronal receptor that partners with AMOG/β2 remains unknown. This review examines the structural and functional properties of AMOG/β2 including its capacity to form trans dimers, both homophilic and potentially heterophilic—drawing comparisons with the β1 subunit, a well-characterized adhesion molecule. By integrating computational modeling, in vitro data, and structural predictions, we explore how factors such as N-glycosylation and cis-membrane interactions influence β2-mediated adhesion. We further consider candidate neuronal partners, including TSPAN31 and RTN4, and speculate on their potential roles in mediating heterophilic AMOG/β2 interactions. Finally, we discuss the broader implications of AMOG/β2 in neuron-glia communication, synaptic organization, neurodevelopment, and CNS disorders such as glioblastoma. Identifying the binding partner of AMOG/β2 holds promise not only for understanding the molecular basis of CNS adhesion but also for uncovering novel mechanisms of neuroglial regulation in health and disease.