A developmentally regulated protein important for microtubule functions. Targets KAR3 to the cytoplasmic microtubules during mating. Essential for KAR3 function during prophase of meiosis I. Required for interhomolog recombination, synapsis of homologous chromosomes and establishment of a meiosis I spindle. Interacts with KAR3. By alpha factor. Present with 98 molecules/cell in log phase SD medium.