Enables microtubule plus-end binding activity. Involved in positive regulation of cyclin-dependent protein serine/threonine kinase activity and positive regulation of transcription, DNA-templated. Acts upstream of or within positive regulation of microtubule plus-end binding activity. Located in cytoplasm; microtubule plus-end; and midbody. Colocalizes with microtubule. Orthologous to human MAPRE3 (microtubule associated protein RP/EB family member 3). [provided by Alliance of Genome Resources, Apr 2022]