Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,cofactor:Magnesium. ,developmental stage:Expression varied mildly across the cell cycle , with highest expression observed in G1 and stationary-phase cells. ,Domain:Dimerizes through its coiled-coil domain. ,enzyme regulation:Activated during mitosis by intramolecular autophosphorylation. Activity and autophosphorylation is activated by manganese >> magnesium ions. Sensitive to increasing concentration of detergents. It is not cell-cycle regulated but activity is higher in G0-arrested cells. ,Function:Pleiotropic regulator of mitotic progression , participating in the control of spindle dynamics and chromosome separation. Phosphorylates different histones , myelin basic protein , beta-casein , and BICD2. Phosphorylates histone H3 on serine and threonine residues and beta-casein on serine residues. Important for G1/S transition and S phase progression. ,PTM:Autophosphorylated on serine and threonine residues. When complexed with FACT , exhibits markedly elevated phosphorylation on Thr-210. During mitosis , not phosphorylated on Thr-210. Phosphorylated by CDC2 in vitro. ,similarity:Belongs to the protein kinase superfamily. NEK Ser/Thr protein kinase family. NIMA subfamily. ,similarity:Contains 1 protein kinase domain. ,similarity:Contains 6 RCC1 repeats. ,subunit:Homodimer. Binds to Ran GTPase. Has a greater affinity for Ran-GDP over Ran-GTP. Interacts with NEK6 , NEK7 and BICD2. Interacts with SSRP1 and SUPT16H , the 2 subunits of the FACT complex. ,tissue specificity:Most abundant in heart , liver , kidney and testis. Also expressed in smooth muscle cells and fibroblasts. ,
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