RT Generic T1 Synapse Formation and Function Across Species: Ancient Roles for CCP, CUB, and TSP-1 Structural Domains A1 Gonzalez-Calvo, Ines A1 Cizeron, Melissa A1 Bessereau, Jean-Louis A1 Selimi, Fekrije K1 synapse K1 molecular conservation K1 CCP K1 CUB K1 TSP-1 K1 invertebrates K1 vertebrates K1 Auxiliary subunit K1 Kainate receptors K1 Sushi domains K1 Transmembrane protein K1 Glutamate receptors K1 Crystal-structure K1 Hikaru-genki K1 Drosophila K1 Molecules K1 Srpx2 AB The appearance of synapses was a crucial step in the creation of the variety of nervous systems that are found in the animal kingdom. With increased complexity of the organisms came a greater number of synaptic proteins. In this review we describe synaptic proteins that contain the structural domains CUB, CCP, or TSP-1. These domains are found in invertebrates and vertebrates, and CUB and CCP domains were initially described in proteins belonging to the complement system of innate immunity. Interestingly, they are found in synapses of the nematode C. elegans, which does not have a complement system, suggesting an ancient function. Comparison of the roles of CUB-, CCP-, and TSP-1 containing synaptic proteins in various species shows that in more complex nervous systems, these structural domains are combined with other domains and that there is partial conservation of their function. These three domains are thus basic building blocks of the synaptic architecture. Further studies of structural domains characteristic of synaptic proteins in invertebrates such as C. elegans and comparison of their role in mammals will help identify other conserved synaptic molecular building blocks. Furthermore, this type of functional comparison across species will also identify structural domains added during evolution in correlation with increased complexity, shedding light on mechanisms underlying cognition and brain diseases. PB Frontiers media sa YR 2022 FD 2022-04-25 LK http://hdl.handle.net/10668/20649 UL http://hdl.handle.net/10668/20649 LA en DS RISalud RD Apr 8, 2025