Nicotinic acetylcholine receptors (nAChRs) comprise a large and ancient family of allosteric ion channels mediating synaptic transmission. The vast knowledge about nAChRs has become difficult to navigate. NAChRDB is a web-accessible resource of curated residue-level functional annotations of neuromuscular nAChRs. Interactive three-dimensional (3D) visualization and sequence alignment give further context to this rich and growing collection of experimental observations and computational predictions. NAChRDB is freely available at https://crocodile.ncbr.muni.cz/Apps/NAChRDB/, with interactive tutorials and regular updates to the content and web interface. No installation or user registration is required. NAChRDB is accessible through any modern internet browser on desktops and mobile devices. By providing immediate and systematic access to practical knowledge gained through decades of research, NAChRDB represents a powerful educational tool and helps guide discovery by revealing gaps in current knowledge and aiding the interpretation of results of molecular and structural biology experiments or computational studies.

CEITEC Central European Institute of Technology Masaryk University Brno 601 77 Czech Republic

Department of Molecular Biology and Genetics Izmir Institute of Technology İzmir 35430 Turkey

National Centre for Biomolecular Research Faculty of Science Masaryk University Brno 625 00 Czech Republic

Protein Data Bank in Europe Wellcome Genome Campus Hinxton Cambridge CB10 1SD U K

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