重组kringle IV-10模块的人类载脂蛋白(a):结构、配位体绑定模式,和生物相关性。
文章的细节
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引用
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程Mochalkin我,B, Klezovitch O, Scanu, Tulinsky
重组kringle IV-10模块的人类载脂蛋白(a):结构、配位体绑定模式,和生物相关性。
生物化学。1999年2月16日,38 (7):1990 - 8。
- PubMed ID
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10026282 (在PubMed]
- 文摘
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kringle模块的载脂蛋白(a) [apo (a)]的脂蛋白(a) [Lp (a)]是高度同源kringle 4的纤溶酶原(75 - 94%)和物后者自主结构和功能单位。(一)包含朊14-37 kringle 4 (KIV)重复分成10类(1 - 10)。Lp (a)结合lysine-Sepharose通过赖氨酸结合位点位于KIV-10(磅)和纤溶酶原K4)物(88%的同源性。W72R替换,发生在恒河猴,偶尔在人类导致受损赖氨酸绑定KIV-10和Lp (a)的能力。上述已被确定的结构调查KIV-10 / M66 (M66变体)unliganded及其配体(epsilon-aminocaproic酸(EACA))绑定模式和结构重组KIV-10 / M66R72 (W72R突变)。此外,EACA配体的结构序列变形(M66T约42 - 50%的人口)是重新审视了(KIV-10 / T66 / EACA)。beplayappKIV-10 / M66 KIV-10 / M66 / EACA和KIV-10 / T66 / EACA分子结构高度同构的,表明kringles是预制的磅预测配位体绑定。位移三个水分子从R35 EACA绑定槽和一个运动将胍盐组接近EACA协助R71稳定的羧酸盐阴离子组附带的配体是唯一改变配体绑定。EACA结构都是在嵌入式绑定模式利用所有三个绑定中心(疏水性阴离子,阳离子)与纤溶酶原kringles物1和4。KIV-10 / T66 / EACA结构决定在这个工作不同于之前报道[Mikol, V。, Lo Grasso, P. V. and, Boettcher, B. R. (1996) J. Mol. Biol. 256, 751-761], which crystallized in a different crystal system and displayed an unbound binding mode, where only the amino group of EACA interacted with the anionic center of the LBS. The remainder of the ligand extended into solvent perpendicular to the kringle surface, leaving the hydrophobic pocket and the cationic center of the LBS unoccupied. The structure of recombinant KIV-10/M66R72 shows that R72 extends along the ligand binding groove parallel to the expected position of EACA toward the anionic center (D55/D57) and makes a salt bridge with D57. Thus, the R72 side chain mimics ligand binding, and loss of binding ability is the result of steric blockage of the LBS by R72 physically occupying part of the site. The rhesus monkey lysine binding impairment is compared with that of chimpanzee where KIV-10 has been shown to have a D57N mutation instead.
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- 药物靶点
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