KINETICS, REGULATION AND MECHANISMS OF BIOCHEMICAL REACTIONS

蛋白质泛素化与许多细胞内的 流程。涉及的酶是：泛素活化酶， E1，泛素载体酶，E2，提供激活的 泛素与其连接酶E3结合，或直接泛化其靶标 蛋白质。在体内和体外都发现了E1的磷酸化。两者都有 E_2-20 kDa和E_2-32 kDa也被一种新的纯化的激酶磷酸化 分别来自HeLa细胞和酪氨酸激酶。在一起吧 暗示蛋白质泛素化受可逆的 磷酸化机制。转录因子Fos和Jun是 在E2-20 kDa时发现具有不同途径的多泛素化， E2-32 kDa和E2-14 kDa/E3β系统，但只有那些被 最后一个系统被26S酶降解。 当完整细胞的细胞膜受到某种临界电场作用时 场强越大，它就会瞬间被渗透。易感性 膜对这种电击穿的影响被发现不依赖于 不仅是电场的大小、方向，而且还有 静息膜电位。 电子顺磁共振波谱和自旋捕获方法 用于识别和监测生物多样性的形成和利用 自由基。人们相信，在监管良好的情况下， 抗氧化酶反应会对细胞造成不可逆转的损害 纸巾。最近我们报道了铜，锌-超氧化物歧化酶的行为 作为一种酶，利用阴离子催化自由基的形成 清道夫和过氧化氢作为底物。现在我们来展示一下 谷胱甘肽和硫醇特有的抗氧化酶的功能是 氧自由基和硫基自由基的清除剂。此外，谷胱甘肽 通过清除自由基起到第一道防线的作用 由于氧化应激而产生，以形成谷胱甘肽自由基 细胞。 用肾小球系膜细胞和小鼠肾小球系膜细胞 HeLa细胞。在系膜细胞中，cAMP依赖的蛋白激酶发挥作用 在调节被刺激或电穿孔的加压素中的作用 三磷酸肌醇可诱导钙离子释放。Ca(II)振荡 组胺诱导的HeLa细胞受钙调素依赖性调控 蛋白激酶II，至少通过其激活内质网的能力 网状细胞Ca-ATPase。

Protein ubiquitination has been implicated in numerous intracellular processes. The enzymes involved are: the ubiquitin activating enzyme, E1, the ubiquitin carrier enzyme, E2, which delivers the activated ubiquitin to its ligase, E3, or directly ubiquitinates its target proteins. E1 was found to be phosphorylated in vivo and in vitro. Both E2-20kDa and E2-32kDa are also phosphorylated by a novel kinase purified from HeLa cells and by a tyrosine kinase, respectively. Together it implies that protein ubiquitination is regulated by a reversible phosphorylation mechanism. Transcription factors, fos and jun, were found to be multi-ubiquitinated with different pathways by the E2-20kDa, E2-32kDa and E2-14kDa/E3beta system, but only those ubiquitinated by the last system are degraded by the 26S protease. When membrane of intact cells is subjected to some critical electric field strength, it becomes transiently permeabilized. The susceptibility of membranes to this dilectric breakdown is found to be dependent not only the magnitude, the direction of the electric field, but also the resting membrane potential. Electron paramagnetic resonance spectroscopy and spin-trapping methods were used to identify and monitor the formation and the utilization of free radicals. It is believed that alterations in well regulated antioxidant enzyme reactions causes irreversible damage to cells and tissues. Recently we reported that Cu,Zn-superoxide dismutase behaves as an enzyme catalyzing the formation of free radicals using anionic scavengers and hydrogen peroxide as substrates. Now we show that glutathione and the thiol specific antioxidant enzyme function as scavengers of oxygen and thiyl radicals. In addition, glutathione functions as a first line of defense by scavenging the free radicals generated due to oxidative stress to form glutathionyl radicals in the cells. Cytosolic Ca(II) oscillation was studied using both mesangial cells and HeLa cells. With mesangial cells, CAMP-dependent protein kinase plays a role in regulating the vasopressin stimulated or electroporated inositol trisphosphate induced Ca(II) release. the Ca(II) oscillation in HeLa cells induced by histamine is regulated by calmodulin-dependent protein kinase II, at least via its capacity to activate the endoplasmic reticulum Ca-ATPase.