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文献和实验Purification and Functional Characterization of C4b-Binding Protein (C4BP)
C4b-binding protein (C4BP) is a soluble, 570 kDa large glycoprotein, present in plasma at a concentration of approximately 200 mg/L. C4BP is the main inhibitor of the classical and lectin pathways of complement, where it controls C4b-mediated
为70kDa)的长链(α链),由549个氨基酸残基组成,链间以二硫键相连结,并共同氨基酸残基组成,链间以二硫键相连结,并共同连结于一中心体。α链含有8个SCR,其N端是其头部,为与C4b相结合的部位,可能位于第332-395位氨基本酸残基。第8条链(β链)较短(45kDa)由235个氨基酸残基组成,含有4个SCR为与蛋白S(PS)相结合的部位(图5-14)。C4bp以两种方式抑制补体的活化。第一种方式是,通过其与C2竞争C4b,而从c 4b2a中取代C2a,并通过其与C4b的结合而阴止剩余的C2
Detection of β-Adrenergic Receptors by Radioligand Binding
The catecholamines epinephrine and norepinephrine produce a wide variety of physiological responses in target cells. Some of these are mediated by β-adrenergic receptors (β-ARs) through the stimulation of adenylyl cyclase and the production
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