PKA-dependent binding of mRNA to the mitochondrial AKAP121 protein

PKA-dependent binding of mRNA to the mitochondrial AKAP121 protein
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DOI:
10.1016/s0022-2836(03)00173-6
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发表时间:
2003-04-04
影响因子:
5.6
通讯作者:
Gottesman, ME
Gottesman, ME
中科院分区:
生物学2区
文献类型:
--
作者:
Ginsberg, MD;Feliciello, A;Gottesman, ME

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蛋白激酶 A (PKA) 锚定蛋白 (AKAP) 将 PKA 束缚到各个亚细胞位置。 AKAP121 将 PKAII 与线粒体外膜连接,包含 K 同源 (KH) RNA 结合基序。纯化的 AKAP121 KH 结构域结合编码线粒体 ATP 合酶和锰超氧化物歧化酶 (MnSOD) 的 Fo-f 亚基的转录本的 3' 非翻译区 (3'UTR)。结合需要 3'UTR 中的结构基序,并受到该结构域的 PKA 磷酸化或模拟这种磷酸化的突变的刺激。 HeLa 细胞中表达的 AKAP121 促进 MnSOD mRNA 从细胞质易位至线粒体,并增加线粒体 MnSOD。这两种反应均受到 cAMP 的刺激。因此,通过将翻译集中在线粒体膜上,AKAP121 可能会响应 cAMP 刺激而促进线粒体蛋白的输入。 (C) 2003 Elsevier Science Ltd. 保留所有权利。
Protein kinase A (PKA) anchoring proteins (AKAPs) tether PKA to various subcellular locations. AKAP121, which tethers PKAII to the outer mitochondrial membrane, includes a K homology (KH) RNA-binding motif. Purified AKAP121 KH domain binds the 3' untranslated regions (3'UTRs) of transcripts encoding the Fo-f subunit of mitochondrial ATP synthase and manganese superoxide dismutase (MnSOD). Binding requires a structural motif in the 3'UTR and is stimulated by PKA phosphorylation of the domain or a mutation that mimics this phosphorylation. AKAP121 expressed in HeLa cells promotes the translocation of MnSOD mRNA from cytosol to mitochondria and an increase in mitochondrial MnSOD. Both reactions are stimulated by cAMP. Thus, by focusing translation at the mitochondrial membrane, AKAP121 may facilitate import of mitochondrial proteins in response to cAMP stimulation. (C) 2003 Elsevier Science Ltd. All rights reserved.