The gastric H+,K+-ATPase: the site of action of omeprazole.

The gastric H+,K+-ATPase: the site of action of omeprazole.
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胃H ,K -ATP酶:奥美拉唑的作用部位。

DOI:
10.3109/00365528909091236
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发表时间:
1989
期刊:
Scandinavian journal of gastroenterology. Supplement
影响因子:
--
通讯作者:
B. Wallmark
B. Wallmark
中科院分区:
--
文献类型:
--
作者:
George Sachs;B. Wallmark

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哺乳动物壁细胞致力于响应各种刺激和第二信使而分泌HCl。细胞中的氧化代谢增加约10倍,以向胃质子泵(H+,K+-ATP酶)提供ATP。这种泵似乎只存在于壁细胞中。这种膜包埋酶利用ATP水解的标量能量在一个方向上进行H+的矢量运输,以在另一个方向上交换K+。在胞质囊泡中,K+不透过膜,而在分泌小管中,存在Cl-通道和KCl共转运途径,其允许K+和Cl-离开细胞。然后K+通过ATP酶再循环回到细胞中,H+分泌进入小管间隙。虽然有其他质子泵,但只有胃H+,K+-ATP酶具有这种交换机制,并且只有胃H+,K+-ATP酶能够产生小于4的pH。因此,胃质子泵具有独特的结构和机制,并产生独特的管腔pH值。因此,这种酶是合理的药物设计的适当目标。
The mammalian parietal cell is dedicated to the secretion of HCl in response to various stimuli and second messengers. Oxidative metabolism in the cell increases about 10-fold in order to supply ATP to the gastric proton pump, the H+,K+-ATPase. This pump appears to be present only in the parietal cell. This membrane-embedded enzyme uses the scalar energy of ATP hydrolysis to carry out the vectorial transport of H+ in one direction in exchange for K+ in the other direction. In the cytoplasmic vesicle, K+ does not permeate the membrane, whereas in the secretory canaliculus, there is a Cl- channel and a KCl cotransport pathway which allow K+ and Cl- to exit from the cell. The K+ is then recycled back into the cell by the ATPase, and H+ secretion occurs into the canalicular space. Although there are other proton pumps, only the gastric H+,K+-ATPase has this exchange mechanism and only the gastric H+,K+-ATPase is able to generate a pH of less than 4. Thus the gastric proton pump has a unique structure and mechanism, and produces a unique luminal pH. This enzyme is therefore an appropriate target for rational drug design.
DOI: --
发表时间: 1986
期刊: The Journal of biological chemistry
影响因子: --
作者:
Rabon,E;Wilke,M;Sachs,G;Zampighi,G
通讯作者: Zampighi,G
大鼠胃 (HK )-ATP 酶的分子克隆。
DOI: --
发表时间: 1986
期刊: The Journal of biological chemistry
影响因子: --
作者:
Shull,GE;Lingrel,JB
通讯作者: Lingrel,JB
通过刺激壁细胞中的酸分泌来激活 Na /H 和 Cl-/HCO3- 交换。
DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
作者:
Muallem,S;Blissard,D;CragoeJr,EJ;Sachs,G
通讯作者: Sachs,G