Kracht M, Truong O, Totty N F, Shiroo M, Saklatvala J
Cytokine Laboratory, Department of Development and Signalling, Babraham Institute, Cambridge, UK.
J Exp Med. 1994 Dec 1;180(6):2017-25. doi: 10.1084/jem.180.6.2017.
We have identified in rabbits two hepatic forms of T669 peptide kinases that are very strongly activated after systemic injection with the inflammatory cytokine interleukin 1 (IL-1). The T669 peptide contains a major phosphorylation site of the epidermal growth factor receptor, threonine 699 and is a substrate for mitogen-activated protein (MAP) kinases. The kinases were purified to homogeneity and corresponded to 50- and 55-kD proteins on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Amino acid sequencing of 12 tryptic peptides of both kinases identified them as p54 MAP kinase alpha. This kinase belongs to the novel family of stress-activated protein kinases. This is the first evidence of IL-1 activating a specific protein kinase in vivo.
我们在兔子体内鉴定出了两种肝型T669肽激酶,在全身性注射炎性细胞因子白细胞介素1(IL-1)后,它们会被强烈激活。T669肽包含表皮生长因子受体的一个主要磷酸化位点,即苏氨酸699,并且是丝裂原活化蛋白(MAP)激酶的底物。这些激酶被纯化至同质,在十二烷基硫酸钠-聚丙烯酰胺凝胶电泳上对应于50-kD和55-kD的蛋白质。对两种激酶的12个胰蛋白酶肽段进行氨基酸测序,确定它们为p54 MAP激酶α。这种激酶属于应激激活蛋白激酶的新家族。这是IL-1在体内激活特定蛋白激酶的首个证据。