Biogenesis of the preprotein translocase of the outer mitochondrial membrane: protein kinase A phosphorylates the precursor of Tom40 and impairs its import

Biogenesis of the preprotein translocase of the outer mitochondrial membrane: protein kinase A phosphorylates the precursor of Tom40 and impairs its import
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线粒体外膜前蛋白转位酶的生物发生:蛋白激酶 A 磷酸化 Tom40 的前体并损害其导入

DOI:
10.1091/mbc.e11-11-0933
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发表时间:
2012
影响因子:
3.3
通讯作者:
Meisinger
Meisinger
中科院分区:
生物学3区
文献类型:
--
作者:
Schmidt;Harbauer;Schönfisch;Guiard;Pfanner;Meisinger

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线粒体外膜(TOM)的前蛋白转位酶作为将核编码蛋白导入线粒体的主要入口门。TOM复合物的主要亚基是三种受体Tom 20、Tom 22和Tom 70以及中央通道形成蛋白Tom 40。已显示胞质激酶调节Tom受体的生物发生和活性。酪蛋白激酶2刺激Tom 22和Tom 20的生物合成,而蛋白激酶A(PKA)损害Tom 70的受体功能。在这里,我们报告PKA对β-桶蛋白Tom 40的生物合成产生抑制作用。Tom 40作为前体在细胞质核糖体上合成,随后输入线粒体。我们发现PKA磷酸化Tom 40的前体。磷酸化的Tom 40前体在输入到线粒体中时受损,而非磷酸化的前体被有效地输入。我们的结论是PKA在TOM复合物的调节中起着双重作用。PKA的磷酸化不仅损害Tom 70的受体活性,而且还抑制通道蛋白Tom 40的生物合成。
The preprotein translocase of the outer mitochondrial membrane (TOM) functions as the main entry gate for the import of nuclear-encoded proteins into mitochondria. The major subunits of the TOM complex are the three receptors Tom20, Tom22, and Tom70 and the central channel-forming protein Tom40. Cytosolic kinases have been shown to regulate the biogenesis and activity of the Tom receptors. Casein kinase 2 stimulates the biogenesis of Tom22 and Tom20, whereas protein kinase A (PKA) impairs the receptor function of Tom70. Here we report that PKA exerts an inhibitory effect on the biogenesis of the β-barrel protein Tom40. Tom40 is synthesized as precursor on cytosolic ribosomes and subsequently imported into mitochondria. We show that PKA phosphorylates the precursor of Tom40. The phosphorylated Tom40 precursor is impaired in import into mitochondria, whereas the nonphosphorylated precursor is efficiently imported. We conclude that PKA plays a dual role in the regulation of the TOM complex. Phosphorylation by PKA not only impairs the receptor activity of Tom70, but it also inhibits the biogenesis of the channel protein Tom40.
环 AMP 蛋白激酶 A 和 Snf1 信号传导机制是蔗糖诱导酿酒酵母丝状形成的卓越功效的基础
DOI: --
发表时间: 2007
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发表时间: 2001-04-01
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DOI: 10.1074/jbc.m313037200
发表时间: 2004-03-26
影响因子: 4.8
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