CAMKIV/CAMK4 Protein, Rat (His)

CAMKIV/CAMK4 protein, a calcium/calmodulin-dependent kinase, operates within the calcium-triggered CaMKK-CaMK4 signaling cascade, exerting regulatory control through phosphorylation on various transcription activators. It notably influences the activity of CREB1, MEF2D, JUN, and RORA, pivotal players in immune response, inflammation, and memory consolidation. In the thymus, CAMKIV regulates the selection threshold of CD4(+)/CD8(+) double positive thymocytes during T-cell ontogeny. In CD4 memory T-cells, it links T-cell antigen receptor (TCR) signaling to the production of IL2, IFNG, and IL4, achieved through the regulation of CREB and MEF2. CAMKIV further plays a role in the differentiation and survival phases of osteoclasts and dendritic cells (DCs), mediating DCs survival by connecting TLR4 signaling and the temporal expression of BCL2. In hippocampal neuron nuclei, CAMKIV phosphorylates the transcription activator CREB1 on 'Ser-133', contributing to memory consolidation and long-term potentiation (LTP) in the hippocampus. Additionally, CAMKIV can activate MAP kinases MAPK1/ERK2, MAPK8/JNK1, and MAPK14/p38, stimulating transcription through the phosphorylation of ELK1 and ATF2. It also demonstrates the ability to phosphorylate CREBBP, PRM2, MEF2A, and STMN1/OP18 in vitro. Notably, CAMKIV is characterized as a heat-stable, acidic, calmodulin-binding protein.