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Updated: May 9, 2026
Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions
Published on: August 2, 2015
Sensitive detection of protein kinase A activity in cell lysates by peptide microarray-based assay
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P R China.
Abstract:
In the present work, the activities of protein kinase A (PKA) in cell lysates have been detected by a peptide microarray-based resonance light scattering assay with gold nanoparticle probes. Highly sensitive detection of PKA activity in 0.1 μg total cell proteins of SHG-44 cell lysate (corresponding to 200 cells) is achieved by a selected peptide substrate. The experimental results also demonstrate that the assay can be employed to evaluate expression levels of PKA activity in different cell lines and chemical (e.g., Forskolin )-mediated PKA activity fluctuation in living cells. In addition, PKA inhibition by the inhibitor (H89) is shown, suggesting the potential for screening PKA inhibitors at the living cell level.
