Regulation of Ras-GAP and the neurofibromatosis-1 gene product by eicosanoids.

Regulation of Ras-GAP and the neurofibromatosis-1 gene product by eicosanoids.
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类花生酸对 Ras-GAP 和神经纤维瘤病-1 基因产物的调节。

DOI:
10.1126/science.1902323
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发表时间:
1991
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Macara,IG
Macara,IG
中科院分区:
--
文献类型:
--
作者:
Han,JW;McCormick,F;Macara,IG

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Ras-GAP (GTPase activation protein)是一种刺激原癌基因产物p21ras内在鸟苷三磷酸酶(GTPase)活性的调节蛋白。神经纤维瘤病基因产物(NF1)的一个结构域与Ras-GAP和酵母IRA基因产物的催化结构域序列相似,也对p21rasGTPase具有特异性刺激活性。花生四烯酸和磷脂酸使GAP失活,但尚未发现刺激GAP从而使p21rasoff开关的药物。利用重组Ha-c-Ras和Ras-GAP、NF1、GAP催化结构域,发现前列腺素pgf2 α、pga2对Ras-GAP有刺激作用,前列腺环素pgi2对Ras-GAP有抑制作用。pgf2 α的刺激作用是饱和的和结构特异性的,并与花生四烯酸的抑制作用竞争。花生四烯酸对NF1的催化活性也有抑制作用,但前列腺素对NF1无刺激作用。这些结果提示通过调节花生四烯酸代谢调节Ras功能的变构控制机制。
Ras-GAP (GTPase activating protein) is a regulatory protein that stimulates the intrinsic guanosine triphosphatase (GTPase) activity of the proto-oncogene product p21ras. A domain of the neurofibromatosis gene product (NF1) that has sequence similarity to the catalytic domain of Ras-GAP and to yeast IRA gene products also has a specific stimulatory activity toward p21rasGTPase. Arachidonic acid and phosphatidic acid inactivate GAP, but no agents have been identified that stimulate GAP and thereby switch p21rasoff. With the use of recombinant Ha-c-Ras and Ras-GAP, NF1, and GAP catalytic domains, it was found that prostaglandins PGF2αand PGA2stimulated Ras-GAP and that prostacyclin PGI2inhibited Ras-GAP. The stimulatory effect of PGF2αwas saturable and structure-specific and competed with the inhibitory effect of arachidonic acid. Arachidonic acid also inhibited the catalytic activity of NF1, but prostaglandins were not stimulatory. These results suggest a mechanism for the allosteric control of Ras function through the modulation of arachidonate metabolism.
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