Protein
CTD kinase subunit alpha
Organism
Schizosaccharomyces pombe (strain 972 / ATCC 24843)
Function
Catalytic subunit of the CTDK-I complex, which hyperphosphorylates the C-terminal heptapeptide repeat domain (CTD) of the largest RNA polymerase II subunit. Involved in RNA polymerase II transcriptional elongation and pre-mRNA 3'-end processing (By similarity). Together with ctk2/lsc1, required for the regulation of cytokinesis by phosphorylating 'Ser-2' residues found in the heptad repeats of the CTD. Required for nuclear localization of ctk2/lsc1. Positively regulates the septation initiation network (SIN) and promotes successful completion of cytokinesis in response to perturbation of the actomyosin ring. Acts in parallel to clp1 to promote actomyosin ring stability upon cytokinesis checkpoint activation.
Similarity
Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. CDC2/CDKX subfamily.
Sequence
MSYSKSTIYRRQGTEPNSHFRRTVEEKSQLSGTNEESLGGHTLSSNAFKNNSSSISPSSSAKDPREQRKRTFPLNDTHSSRARQHERPFRSRKSRRRKGKKAFSPRPGSPPSPSFYRSGSQKRARNLTTKDYFAKRSESSSSASVSPISPSANRNDSKRQASSFRRSPPSSVHMKPSAFNGRKVSRRPSSSPPPIPSIPHETTSSDTQKKSSVSSGFPENKHGKFHFHIPNERRSRFDQPPSKRMALTSTARESVPAPLPSPPSGPIYTYTYPKPAYEKIDQIGEGTYGKVYKAINTVTGDLVALKRIRLEQEKDGFPITTVREVKILQRLRHKNIVRLLEIMVEKSSVYMVFEYMDHDLTGVLLNSQLHFTPGNIKHLSKQIFEALAYLHHRGVLHRDIKGSNILLNNNGDLKFADFGLARFNTSSKSANYTNRVITLWFRPPELLLGETAYDTAVDIWSAGCIVMELFTGKPFFQGRDEISQLEVIYDMMGTPDVHSWPEVKNLPWYELLKPVEEKKSRFVETFKEILSPAAIDLCQKLLALNPFCRPSAHETLMHEYFTSESPPPEPAVILKNMQGSWHEWESKKRKSKR