Protein kinase that plays a role in vesicle-mediated transport processes and exocytosis. Regulates GH1 release by brain neurons. Phosphorylates NSF, and thereby regulates NSF oligomerization. Required for normal spermatogenesis. Regulates neuron differentiation and dendrite development (By similarity). Plays a role in the regulation of insulin secretion in response to changes in blood glucose levels. Can phosphorylate CCNY at 'Ser-336' (in vitro). {ECO:0000250, ECO:0000269|PubMed:22184064, ECO:0000269|PubMed:22796189, ECO:0000269|PubMed:22798068}. This is the function of CDK16 (cyclin dependent kinase 16, ENSG00000102225).