Calcium/calmodulin-dependent protein kinase type IV

Calcium/calmodulin-dependent protein kinase type IV (CaMK IV) is a serine/threonine kinase that functions in calcium-triggered signaling cascades, primarily by phosphorylating transcription factors including CREB1, MEF2D, JUN, and RORA (UniProt: Q16566). The kinase regulates immune responses, inflammation, and memory consolidation through these downstream targets.

CaMK IV operates across multiple physiological contexts, including T-cell development in the thymus, immune cell survival and differentiation, and hippocampal synaptic plasticity. In neurons, it phosphorylates CREB1 in hippocampal nuclei to support long-term potentiation and memory consolidation—processes central to cognitive function (UniProt: Q16566). The enzyme also activates mitogen-activated protein kinases and influences transcription through ELK1 and ATF2 phosphorylation.

In Alzheimer's Disease, CaMK IV is significantly down-regulated in post-mortem AD brain tissue compared to age-matched controls, with a mean log2 fold-change of −0.73 across subcellular fractions (Chaparral AD proteomics). This reduction may compromise calcium-dependent signaling and transcriptional regulation in affected neurons, potentially contributing to cognitive decline and memory dysfunction characteristic of AD pathology.