Atrial natriuretic peptide is phosphorylated by intact cells through cAMP-dependent ecto-protein kinase.

Atrial natriuretic peptide is phosphorylated by intact cells through cAMP-dependent ecto-protein kinase.
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心钠素通过 cAMP 依赖性胞外蛋白激酶被完整细胞磷酸化。

DOI:
10.1111/j.1432-1033.1992.tb16915.x
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发表时间:
1992
期刊:
European journal of biochemistry
影响因子:
--
通讯作者:
V. Kinzel
V. Kinzel
中科院分区:
--
文献类型:
--
作者:
D. Kübler;D. Reinhardt;J. Reed;W. Pyerin;V. Kinzel

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最近,我们证明了许多不同细胞类型中存在位于细胞表面的 cAMP 依赖性蛋白激酶 (ecto-PK A) 活性 [Kübler, D.、Pyerin, W.、Bill, O.、Hotz, A.、Sonka, J. 和 Kinzel, V. (1989) J. Biol. 1989。化学。 264、14549-14555]。外部定向激酶活性的生理作用问题促使人们寻找细胞间液中存在的潜在天然底物。在本研究中,我们研究了人心房钠尿肽 ANP99-126(一种心肌细胞释放的激素)的 ecto-PK A 磷酸化。这种 28 个氨基酸肽携带 PK A 的磷酸化共有序列 Arg-Arg-Ser-Ser。在低微摩尔浓度 ATP 存在的情况下,将各种细胞系(包括上皮细胞、表皮细胞、成肌细胞和淋巴瘤细胞)或新鲜分离的血细胞(巨噬细胞、红细胞和血小板)与 ANP 一起孵育,会导致 ANP 在 Ser 残基处磷酸化。 ANP 磷酸化反应严格依赖于 cAMP; cAMP 不能被 cGMP 替代。磷酸化受到 PK A 特异性抑制肽的抑制,并线性增加长达 15 分钟,ANP 的 Km 值为 3-5 microM。在较高的 ATP 浓度(大于 100 µM)下,掺入速率约为 0.3 mmol P (mol ANP)-1 min-1。在应用 β-肾上腺素能受体激动剂异丙肾上腺素后,HEL30(表皮细胞系)中细胞内 cAMP 的升高导致 ANP 磷酸化受到大约三倍的刺激,这似乎是由细胞内 cAMP 外流引起的。利用细胞上清液和细胞超声处理,可以表明ANP的磷酸化是由胞外PKA引起的。将ANP与使用纯化的PKA催化亚基体外磷酸化的ANP进行比较表明,磷酸化伴随着肽的平均溶液构象的某些变化,这与已知的其生物活性中发生的变化一致。我们的结果证明完整细胞通过 ecto-PK A 对肽激素类似物 ANP99-126 进行 cAMP 依赖性磷酸化,这是 ANP 翻译后加工的一种有趣机制。
Recently we demonstrated the presence of cell-surface-located cAMP-dependent protein kinase (ecto-PK A) activity in a number of different cell types [Kübler, D., Pyerin, W., Bill, O., Hotz, A., Sonka, J. and Kinzel, V. (1989) J. Biol. Chem. 264, 14549-14555]. The question of the physiological role of externally directed kinase activity prompted a search for potential natural substrates present in the intercellular fluid. In the present study we have investigated the phosphorylation by ecto-PK A of the human atrial natriuretic peptide ANP99-126, a hormone released by cardiac cells. This 28-amino-acid peptide carries the phosphorylation consensus sequence Arg-Arg-Ser-Ser for the PK A. Incubation of various cell lines (including epithelial, epidermal, myoblast and lymphoma cells) or freshly isolated blood cells (macrophages, erythrocytes and platelets) with ANP in the presence of low micromolar concentrations of ATP resulted in the phosphorylation of ANP at Ser residues. The ANP phosphorylation reaction proved strictly dependent on cAMP; cAMP could not be replaced by cGMP. The phosphorylation was inhibited by the PK A-specific inhibitory peptide and increased linearily for up to 15 min and with a Km value of 3-5 microM for ANP. At higher ATP concentrations (greater than 100 microM) the incorporation rates amounted to about 0.3 mmol P (mol ANP)-1 min-1. The rise of intracellular cAMP in HEL30 (an epidermal cell line) after application of the beta-adrenergic receptor agonist isoproterenol led to an approximately three-fold stimulation of ANP phosphorylation which appears to be brought about by an efflux of intracellular cAMP. Employing cell supernatant fluids and cell sonicates, it could be shown that the phosphorylation of ANP results from the ecto-PK A. Comparison of ANP with ANP phosphorylated in vitro using purified catalytic subunit of PK A showed that phosphorylation is accompanied by certain changes in the average solution conformation of the peptide, consistent with the changes known to occur in its biological activity. Our results demonstrate cAMP-dependent phosphorylation of the peptide hormone analogue ANP99-126 by intact cells through ecto-PK A, an intriguing mechanism for post-translational processing of ANP.
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