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首页> 外文期刊>Biochemistry >Structure of Human Hyaluronidase-1,a Hyaluronan Hydrolyzing Enzyme Involved in Tumor Growth and Angiogenesis
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Structure of Human Hyaluronidase-1,a Hyaluronan Hydrolyzing Enzyme Involved in Tumor Growth and Angiogenesis

机译:人透明质酸水解酶人类透明质酸酶1的结构,参与肿瘤生长和血管生成。

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摘要

Mammalian hyaluronidases hydrolyze hyaluronan,a polysaccharide of diverse physiological roles found in all tissues and body fluids.In addition to its function in normal cellular hyaluronan turnover,human hyaluronidase-1 is implicated in cancer proliferation,angiogenesis,and inflammatory diseases;its expression is up-regulated in advanced stages of bladder cancer,whereas the expression of the alternative splice-variants is down-regulated.The crystal structure reveals a molecule composed of two closely associated domains:a catalytic domain that adopts a distorted (beta/alpha)8 barrel resembling that of bee venom hyaluronidase,and a novel,EGF-like domain,characteristic of involvement in protein-protein interactions and regulatory processes.The structure shows that the fold of this unique EGF-like domain is intact in four alternative splice-variants,whereas the catalytic domain is likely to be unfolded.Thus,these variants may function by competing with the full-length enzyme for the putative protein partner and regulating enzymatic activity in healthy cells.
机译:哺乳动物透明质酸酶水解透明质酸,一种在所有组织和体液中发现的具有多种生理作用的多糖。除了在正常的细胞透明质酸更新中起作用外,人透明质酸酶-1还参与了癌症的增殖,血管生成和炎性疾病;其表达向上-在晚期膀胱癌中被调节,而其他剪接变体的表达被下调。晶体结构揭示了一个分子,该分子由两个紧密相关的结构域组成:一个催化结构域,其结构是扭曲的(β/ alpha)8桶类似于蜂毒透明质酸酶,以及一个新颖的,类似于EGF的结构域,具有参与蛋白质-蛋白质相互作用和调控过程的特征。该结构表明,在四个替代剪接变体中,这种独特的EGF-类似结构域的折叠是完整的,因此,这些变体可能通过与全长酶竞争腐烂而起作用。 ve蛋白伴侣并调节健康细胞中的酶活性。

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