Protein
Ion channel CASTOR
Function
Ion channel with a moderate preference for potassium over sodium and calcium. Involved in perinuclear calcium spiking but not in cytosolic calcium influx. Closed at negative voltages in presence of magnesium. Required for early signal transduction events leading to endosymbiosis. Acts early in a signal transduction chain leading from the perception of Nod factor to the activation of calcium spiking. Also involved in fungal entry into root epidermal cells during the establishment of the arbuscular mycorrhizal symbiosis.
Similarity
Belongs to the castor/pollux (TC 1.A.1.23) family.
Sequence
MSLDSEVSVSSSSGRDWFFPSPSFFRSSPSQYGRRFHTNSNTHSAPSSTYPSGIRHRRRVKFSRTPTTSSNEKPQISIVSDKPSAISKNNLNWLSQFGLQFALVTLTIVFLLLLLLRNTHLESQVNKLQGEILRLHACHQLDTLNVSSSTAHKSQDTHPCSCENFKRNLALFLSFMLLLIPLIIFKYIDYVSRSRLSENISEQVSLNKQIAYRVDVFLSVYPYAKPLVLLVATLLLIFLGGLTLFGVTTEDLGHCLWLSWTYVADSGNHASSEGIGPRLVAVSISFGGMLIFAMMLGLVSDAISEKFDSLRKGKSEVVEQNHTLILGWSDKLGSLLNQLAIANESLGGGTIAVMAERDKEDMELDIGKMEFDFKGTSVICRSGSPLILADLKKVSVSKARTIIVLAEDGNADQSDARALRTVLSLTGVKEGLRGHIVVEMSDLDNEVLVKLVGGDLVETVVAHDVIGRLMIQCARQPGLAQIWEDILGFENCEFYIKRWPQLDGMLFEDVLISFPAAIPCGIKVASYGGKIILNPDDSYVLQEGDEVLVIAEDDDTYAPAPLPMVRRGSLPKDFVYPKSPERILFCGWRRDMEDMITVLDASLAPDSELWMFNDVPEKEREKKLIDGGLDISRLENISLVNREGNAVIRRHLESLPLESFDSILILADESVEDSAIQADSRSLATLLLIRDIQARRLPYVAMASQTQGGNFSKGSWIGEMKQASDKTVIISEILDPRTKNLLSMSKISDYVLSNELVSMALAMVAEDRQINDVLEELFAEEGNEMHIRQADIYLREGEEMSFYEIMLRARQRREILIGYRLANAERAVINPPAKTGRRKWSLKDVFVVITEKE