首页> 外文期刊>Urology >Decreased inhibitory activity of prothrombin to calcium oxalate crystallization by specific chemical modification of its gamma-carboxyglutamic acid residues.
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Decreased inhibitory activity of prothrombin to calcium oxalate crystallization by specific chemical modification of its gamma-carboxyglutamic acid residues.

机译:通过凝血酶原γ-羧基谷氨酸残基的特异性化学修饰,降低凝血酶原对草酸钙结晶的抑制活性。

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OBJECTIVES: To investigate the inhibitory role of gamma (gamma)-carboxyglutamic acid (Gla) in the Gla domain of urinary prothrombin in the formation of calcium oxalate crystals. METHODS: Morpholine and formaldehyde at different concentrations were added to the solution of prothrombin to cause the conversion of Gla to gamma-methyleneglutamic acid (MGlu). The extent of the modification was controlled by the relative amount of modification reagents to prothrombin. The 100-fold molar excess of modification reagents to prothrombin produced the prothrombin molecule containing 2gamma-MGlu residues, and the 10,000-fold molar excess produced the molecule containing 8gamma-MGlu residues. The inhibitory activities of prothrombin and modified prothrombin to calcium oxalate crystallization were evaluated by the seeded crystallization technique. RESULTS: The inhibitory index of Gla prothrombin to calcium oxalate crystallization was 14.2%, that of 2gamma-MGlu prothrombin was 12.8%, decreased by about 10%, and that of 8gamma-MGlu prothrombin was 5.0%, decreased by about 65%. CONCLUSIONS: The Gla in the Gla domain of urinary prothrombin may play an important role in inhibiting the formation of renal calcium oxalate calculus.
机译:目的:研究γ(γ)-羧基谷氨酸(Gla)在尿液凝血酶原的Gla结构域中对草酸钙晶体形成的抑制作用。方法:将不同浓度的吗啉和甲醛加入凝血酶原溶液中,使Gla转化为γ-亚甲基谷氨酸(MGlu)。修饰的程度由修饰剂与凝血酶原的相对量控制。修饰试剂对凝血酶原的摩尔过量为100倍,产生的凝血酶原分子含有2gamma-MGlu残基,而摩尔过量的10,000倍摩尔产生了含有8gamma-MGlu残基的分子。用种子结晶技术评价凝血酶原和修饰的凝血酶原对草酸钙结晶的抑制活性。结果:Gla凝血酶原对草酸钙结晶的抑制指数为14.2%,2gamma-MGlu凝血酶原的抑制指数为12.8%,下降约10%,8gamma-MGlu凝血酶原的抑制指数为5.0%,下降约65%。结论:尿液中凝血酶原的Gla区的Gla可能在抑制肾草酸钙结石的形成中起重要作用。

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