Transcription regulator complex subunit that is essential for cell cycle progression. Leads to only a few rounds of cell division before arresting with an elongated cell (cdc) phenotype. Belongs to the NC2 alpha/DRAP1 family. SPAC17G8.03c was previously identified as the homolog of budding yeast DBP3 in fission yeast (PubMed:15388803). However, it was further demonstrated that SPCC16C4.22 is the true ortholog of DBP3 (PubMed:29109278).