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Molecular basis of AKAP specificity for PKA regulatory subunits

机译:AKAP对PKA调节亚基的特异性的分子基础

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Localization of cyclic AMP (cAMP)-dependent protein kinase (PKA) by A kinase-anchoring proteins (AKAPs) restricts the action of this broad specificity kinase. The high-resolution crystal structures of the docking and dimerization (D/D) domain of the RII alpha regulatory subunit of PKA both in the apo state and in complex with the high-affinity anchoring peptide AKAP-IS explain the molecular basis for AKAP-regulatory subunit recognition. AKAP-IS folds into an amphipathic a helix that engages an essentially preformed shallow groove on the surface of the RII dimer D/D domains. Conserved AKAP aliphatic residues dominate interactions to RII at the predominantly hydrophobic interface, whereas polar residues are important in conferring R subunit isoform specificity. Using a peptide screening approach, we have developed SuperAKAP-IS, a peptide that is 10,000-fold more selective for the RII isoform relative to RI and can be used to assess the impact of PKA isoform-selective anchoring on cAMP-responsive events inside cells.
机译:A激酶锚定蛋白(AKAP)对环状AMP(cAMP)依赖性蛋白激酶(PKA)的定位限制了这种广泛特异性激酶的作用。载脂蛋白状态和高亲和力锚定肽AKAP-IS复杂的PKA RIIα调节亚基的对接和二聚化(D / D)域的高分辨率晶体结构解释了AKAP-的分子基础调节亚基识别。 AKAP-IS折叠成两亲性螺旋,该螺旋与RII二聚体D / D结构域表面上基本预先形成的浅凹槽接合。保守的AKAP脂族残基主要在疏水界面上与RII相互作用,而极性残基在赋予R亚基同工型特异性方面很重要。使用肽筛选方法,我们开发了SuperAKAP-IS,该肽相对于RI对RII亚型的选择性高10,000倍,可用于评估PKA亚型选择性锚定对细胞内cAMP响应事件的影响。

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