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PKA-dependent Binding of mRNA to the Mitochondrial AKAP121 Protein.

机译:mRNA与线粒体AKAP121蛋白的PKA依赖性结合。

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摘要

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.
机译:蛋白激酶A(PKA)锚定蛋白(AKAP)将PKA拴在各个亚细胞位置。 AKAP121将PKAII束缚在线粒体外膜上,包括一个K同源(KH)RNA结合基序。纯化的AKAP121 KH域与编码线粒体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。结合需要3'UTR中的结构基序,并受到域的PKA磷酸化或模拟该磷酸化的突变的刺激。 HeLa细胞中表达的AKAP121促进MnSOD mRNA从细胞质到线粒体的转运,并增加线粒体MnSOD。两种反应均受cAMP刺激。因此,通过将翻译集中在线粒体膜上,AKAP121可以响应cAMP刺激促进线粒体蛋白的导入。

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