Protein kinase CK2 and new binding partners during spermatogenesis.
Protein kinase CK2 is an ubiquitously expressed enzyme that is absolutely necessary for the survival of cells. Besides the holoenzyme consisting of the regulatory β-subunit and the catalytic α- or α'-subunit, the subunits exist in separate forms. The subunits bind to a number of other cellular proteins. We show the expression of individual subunits as well as interaction with the transitional nuclear protein TNP1 and with the motor neuron protein KIF5C during spermatogenesis. TNP1 is a newly identified binding partner of the α-subunit of CK2. CK2α and KIF5C were found in late spermatogenesis, whereas CK2β and TNP1 were found in early spermatogenesis. CK2α, CK2α', TNP1, and KIF5C were detected in the acrosome of spermatozoa, while CK2β was detectable in the mid-piece. Combinations of CK2 subunits might determine interactions with other proteins during spermatogenesis. KIF5C as a kinesin motor neuron protein is probably involved in the redistribution of proteins during spermatogenesis.
Department of Anatomy and Cell Biology, University of the Saarland, Homburg, Germany.
Nadja
N
Mannowetz
Sabine
S
Kartarius
Gunther
G
Wennemuth
Mathias
M
Montenarh
D000818:Animals; D047390:Casein Kinase II / Q000032:analysis / Q000378:metabolism*; D002868:Chromosomal Proteins, Non-Histone / Q000032:analysis / Q000378:metabolism; D008297:Male; D051379:Mice; D008869:Microtubule-Associated Proteins / Q000032:analysis / Q000378:metabolism; D011485:Protein Binding; D013091:Spermatogenesis; D013094:Spermatozoa / Q000166:cytology / Q000378:metabolism; D013737:Testis / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure
D002868:Chromosomal Proteins, Non-Histone; C411575:KIFC5 protein, mouse; D008869:Microtubule-Associated Proteins; C053886:spermatid transition proteins; D047390:Casein Kinase II