Angiotensinogen and the Modulation of Blood Pressure.

Angiotensinogen and the Modulation of Blood Pressure.
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血管紧张素原和血压的调节

DOI:
10.3389/fcvm.2021.645123
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发表时间:
2021
影响因子:
3.6
通讯作者:
Zhou A
Zhou A
中科院分区:
医学3区
文献类型:
--
作者:
Shu Z;Wan J;Read RJ;Carrell RW;Zhou A

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控制血压的血管紧张素肽从非抑制性血浆丝氨酸蛋白酶抑制剂(血管紧张素原)中释放,其延伸的N-末端尾部被特异性乙酰基蛋白酶(肾素)切割。血管紧张素原以前被认为是一个被动的底物,但我们在这里描述如何最近的研究揭示了一个固有的构象机制,这是至关重要的切割和释放的血管紧张素肽,从而控制血压。血管紧张素原及其衍生物形式的一系列晶体学结构,以及其与肾素的复合物,在分子细节上显示了与肾素的相互作用如何引发血管紧张素原氨基末端尾部的深刻转变,并在几个水平上发生调节。血管紧张素原的尾部受到不稳定的二硫键的限制,其氧化还原状态的变化影响血管紧张素的释放,这在妊娠高血压并发症先兆子痫中得到证实。尾部的移位也通过尾在口中变构机制增强了肾素的结合。现在看到N-末端插入到一个口袋里,相当于其他丝氨酸蛋白酶抑制剂上的酶结合位点,血管紧张素原的螺旋H解旋形成与肾素的关键相互作用。研究结果解释了确切的物种特异性的相互作用与肾素和变异碳水化合物的联系。总的来说,这些研究提供了新的见解血管紧张素释放的生理调节,能够响应局部组织和温度的变化,并与开放的战略,用于治疗高血压的新药物的开发。
The angiotensin peptides that control blood pressure are released from the non-inhibitory plasma serpin, angiotensinogen, on cleavage of its extended N-terminal tail by the specific aspartyl-protease, renin. Angiotensinogen had previously been assumed to be a passive substrate, but we describe here how recent studies reveal an inherent conformational mechanism that is critical to the cleavage and release of the angiotensin peptides and consequently to the control of blood pressure. A series of crystallographic structures of angiotensinogen and its derivative forms, together with its complexes with renin show in molecular detail how the interaction with renin triggers a profound shift of the amino-terminal tail of angiotensinogen with modulation occurring at several levels. The tail of angiotensinogen is restrained by a labile disulfide bond, with changes in its redox status affecting angiotensin release, as demonstrably so in the hypertensive complication of pregnancy, pre-eclampsia. The shift of the tail also enhances the binding of renin through a tail-in-mouth allosteric mechanism. The N-terminus is now seen to insert into a pocket equivalent to the hormone-binding site on other serpins, with helix H of angiotensinogen unwinding to form key interactions with renin. The findings explain the precise species specificity of the interaction with renin and with variant carbohydrate linkages. Overall, the studies provide new insights into the physiological regulation of angiotensin release, with an ability to respond to local tissue and temperature changes, and with the opening of strategies for the development of novel agents for the treatment of hypertension.
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发表时间: 1998-10-02
期刊: FEBS LETTERS
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期刊: BIOCHIMICA ET BIOPHYSICA ACTA
影响因子: --
作者:
CUMIN, F;LENGUYEN, D;CORVOL, P
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