The activity of cAMP-phosphodiesterase 4D7 (PDE4D7) is regulated by protein kinase A-dependent phosphorylation within its unique N-terminus.

The activity of cAMP-phosphodiesterase 4D7 (PDE4D7) is regulated by protein kinase A-dependent phosphorylation within its unique N-terminus.
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DOI:
10.1016/j.febslet.2015.02.004
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发表时间:
2015-03-12
期刊:
影响因子:
3.5
通讯作者:
Baillie GS
Baillie GS
中科院分区:
生物学3区
文献类型:
--
作者:
Byrne AM;Elliott C;Hoffmann R;Baillie GS

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PDE4D7在丝氨酸42的独特n端区域被PKA磷酸化。PDE4D7丝氨酸42磷酸化负调控PDE4活性。丝氨酸42磷酸化的消蚀激活了PDE4D7,这减少了UCR1结构域的磷酸化。环AMP磷酸二酯酶4型(pde4)以细胞特异性方式表达,由独特的n端锚定结构域指导细胞内靶向。所有长形pde4都被上游保守区1 (UCR1)内的PKA磷酸化并激活。在这里,我们在PDE4D7的n端区域鉴定并表征了一个新的PKA位点(丝氨酸42),PDE4D7是一种亚型,其活性已知在前列腺癌进展和缺血性中风中很重要。与UCR1位点相反,PKA对PDE4D7 n端的磷酸化似乎是组成性的,并抑制PDE4活性,从而在基础条件下允许cAMP信号传导。
PDE4D7 is phosphorylated by PKA in the unique N-terminal region at serine 42. PDE4D7 phosphorylation at serine 42 negatively regulates PDE4 activity. Ablation of phosphorylation at serine 42 activates PDE4D7 and this reduces phosphorylation in the UCR1 domain. The cyclic AMP phosphodiesterases type 4 (PDE4s) are expressed in a cell specific manner, with intracellular targeting directed by unique N-terminal anchor domains. All long form PDE4s are phosphorylated and activated by PKA phosphorylation within their upstream conserved region 1 (UCR1). Here, we identify and characterise a novel PKA site (serine 42) within the N-terminal region of PDE4D7, an isoform whose activity is known to be important in prostate cancer progression and ischemic stroke. In contrast to the UCR1 site, PKA phosphorylation of the PDE4D7 N-terminus appears to occur constitutively and inhibits PDE4 activity to allow cAMP signalling under basal conditions.
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