Testis-specific serine/threonine-protein kinase required during spermatid development. Phosphorylates 'Ser-288' of TSKS. Involved in the late stages of spermatogenesis, during the reconstruction of the cytoplasm. During spermatogenesis, required for the transformation of a ring-shaped structure around the base of the flagellum originating from the chromatoid body.
Subcellular locations: Cytoplasm, Cytoplasmic vesicle, Secretory vesicle, Acrosome, Cell projection, Cilium, Flagellum
In spermatozoa, present in the sperm head and in the flagellum.
Testis-specific. Present in sperm (at protein level).