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
中科院分区:
文献类型:
--
作者:
Schmidt;Harbauer;Schönfisch;Guiard;Pfanner;Meisinger
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.
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影响因子:
--
作者:
S. Van de Velde;J. Thevelein
通讯作者:
J. Thevelein
影响因子:
3.3
作者:
D. Rapaport;R. D. Taylor;M. Käser;T. Langer;W. Neupert;F. Nargang
通讯作者:
D. Rapaport;R. D. Taylor;M. Käser;T. Langer;W. Neupert;F. Nargang
DOI:
10.1038/86253
发表时间:
2001-04-01
期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
--
作者:
Model, K;Meisinger, C;Ryan, MT
通讯作者:
Ryan, MT
影响因子:
64.5
作者:
Schmidt, Oliver;Harbauer, Angelika B.;Meisinger, Chris
通讯作者:
Meisinger, Chris
影响因子:
4.8
作者:
Hoppins, SC;Nargang, FE
通讯作者:
Nargang, FE