CHK1 is a 56 kd serine/threonine protein kinase that was originally identified in fission yeast to play a role in activation of the DNA damage checkpoint in the G2 phase of the cell cycle (1). CHK1 appears to function downstream of several of the known fission yeast checkpoint gene products, including that encoded by rad3+, a gene with sequence similarity to the ATM gene mutated in patients with ataxia telangiectasia (2). In vitro, CHK1 binds to and phosphorylates the dual-specificity protein phosphatases Cdc25A, Cdc25B, and Cdc25C, which control cell cycle transitions by dephosphorylating cyclin-dependent kinases (3). CHK1 phosphorylates Cdc25C on serine-216 which creates a binding site for 14-3-3 protein and inhibits function of the phosphatase. Thus, in response to DNA damage, CHK1 phosphorylates and inhibits Cdc25C, thereby preventing the activation of the Cdc2-cyclin B complex and mitotic entry.
序列
CHK1蛋白,有活性的蛋白产品,又称CHK, Serine/threonine-protein kinase Chk1, CHK1 checkpoint homolog, Cell cycle checkpoint kinase, Checkpoint kinase-1 .其对应NCBI基因号为2932,NCBI基因别称为GSK3B源,对应Accession号为P49841.该蛋白产品又称chk-1, chk 1, Active CHK1, CHK1, CHK, human CHK1, active kinase, active kinases, recombinant CHK1, recombinant CHK, kinase activity assay, protein kinase等.
来源宿主
提供的【CHK1】CHK1蛋白,有活性的产品的来源为Sf9昆虫细胞-杆状病毒中重组表达.
溶解建议
提供的CHK1蛋白,有活性的 产品为液态形式溶解于储存液(50 mM Tris-HCl, pH 7.5, 150 mM NaCl, 0.25 mM DTT, 0.1 mM EGTA, 0.1 mM EDTA, 0.1 mM PMSF, 25% 甘油)中.