Spatiotemporal regulation of PKC via interactions with AKAP7 isoforms.

The regulation of kinases by scaffolding proteins greatly contributes to the fidelity of signal transduction. In the present study, we explored an interaction between the ubiquitous enzyme (protein kinase C) and the scaffolding protein AKAP7 (A-kinase-anchoring protein 7). Using protein biochemistry and surface plasmon resonance approaches, we demonstrate that both AKAP7γ and AKAP7α are capable of high-affinity interactions with multiple isoenzymes of Furthermore, this interaction is achieved via multi-site binding on both proteins. FRET (fluorescence resonance energy transfer) analysis using a duanyu1531 activity reporter suggests that anchoring of the kinase within AKAP7 complexes enhances the phosphorylation of substrate proteins. Finally, we determined using FRAP (fluorescence recovery after photobleaching) and virtual modelling that AKAP7 restricts the mobility of duanyu1531 within cells by tethering it to subcellular compartments. Collectively, the results of the present study suggests that AKAP7 could play an integral role in dictating duanyu1531 localization and function in tissues where the two proteins are co-expressed.

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