This research provides a comprehensive proteomic and functional analysis of the membrane-associated periodic skeleton (MPS), a lattice structure in neurons made of actin and spectrin. By utilizing mass spectrometry, the scientists identified hundreds of candidate proteins that interact with this skeleton, spanning categories like motor proteins, ion channels, and signaling molecules. Through super-resolution imaging (STORM), they confirmed that approximately 20 of these proteins exhibit the periodic distribution characteristic of the MPS. The study further demonstrates that non-muscle myosin II interacts with the MPS to regulate axonal diameter through radial contraction. Additionally, the findings suggest that this molecular framework is essential for maintaining structural integrity and facilitating interactions between different neuronal processes. Overall, the work establishes the MPS as a sophisticated signaling and structural platform vital for proper brain development and function.

References:

• Zhou, R., Han, B., Nowak, R. et al. Proteomic and functional analyses of the periodic membrane skeleton in neurons. Nat Commun 13, 3196 (2022). doi.org