Regulation of cAMP-dependent Protein Kinases

Regulation of cAMP-dependent Protein Kinases
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cAMP 依赖性蛋白激酶的调节

DOI:
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发表时间:
2010
影响因子:
4.8
通讯作者:
A. Prinz
A. Prinz
中科院分区:
生物学2区
文献类型:
--
作者:
M. Diskar;Hans;A. Kaupisch;Melanie Kaufholz;Stefanie Brockmeyer;Daniel Sohmen;M. Berrera;M. Zaccolo;M. Boshart;F. Herberg;A. Prinz

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CAMP依赖的蛋白激酶可逆地与调节(R)亚基的四个亚基中的任何一个亚基复合,这些亚基包含底物或假底物自抑制域。人类蛋白激酶X(PrKx)是一个例外,因为它只被伪底物抑制剂,即RIα或RIβ抑制,而不被底物抑制剂RIIα或RIIβ抑制。详细研究了从人到原虫(布氏锥虫)的五种PrKX样蛋白在活细胞中与人R亚基形成全酶的能力,结果表明,这种对伪底物抑制剂的偏好在进化上是保守的。为了阐明这种抑制模式的分子基础,我们应用了生物发光共振能量转移和表面等离子体共振结合定点突变。我们观察到,PrKX中保守的αH-αI环残基Arg-283是其RI优先于RII的关键,因为R283L突变体能够与野生型RII亚基形成全酶复合体。改变PKA Cα(L277R)中相应的H-αI环残基,在体外显著不稳定全酶复合体,因为cAMP介导的全酶激活被2-4倍的促进,并导致突变的C亚基与R亚基的亲和力降低,显著影响含有全酶的RII。
cAMP-dependent protein kinases are reversibly complexed with any of the four isoforms of regulatory (R) subunits, which contain either a substrate or a pseudosubstrate autoinhibitory domain. The human protein kinase X (PrKX) is an exemption as it is inhibited only by pseudosubstrate inhibitors, i.e. RIα or RIβ but not by substrate inhibitors RIIα or RIIβ. Detailed examination of the capacity of five PrKX-like kinases ranging from human to protozoa (Trypanosoma brucei) to form holoenzymes with human R subunits in living cells shows that this preference for pseudosubstrate inhibitors is evolutionarily conserved. To elucidate the molecular basis of this inhibitory pattern, we applied bioluminescence resonance energy transfer and surface plasmon resonance in combination with site-directed mutagenesis. We observed that the conserved αH-αI loop residue Arg-283 in PrKX is crucial for its RI over RII preference, as a R283L mutant was able to form a holoenzyme complex with wild type RII subunits. Changing the corresponding αH-αI loop residue in PKA Cα (L277R), significantly destabilized holoenzyme complexes in vitro, as cAMP-mediated holoenzyme activation was facilitated by a factor of 2–4, and lead to a decreased affinity of the mutant C subunit for R subunits, significantly affecting RII containing holoenzymes.
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