title: Label-free fluorescence assay for protein kinase based on peptide biomineralized gold nanoclusters as signal sensing probe.
abstract: A label-free, sensitive and simple method to detect protein kinase based on the selective aggregation of phosphorylated peptide-gold nanoclusters (peptide-AuNCs) triggered by Zr(4+) ion coordination is developed. The AuNCs were synthesized by peptide without any strong reducing agents, which prevent peptides from being disrupted. Under optimal conditions, a linear relationship between the decreased PL intensity of peptide-AuNCs and the concentration of casein kinase II (CK2) in the range of 0.08-2.0 unit mL(-1) with a detection limit of 0.027 unit mL(-1) (3σ) was obtained. The feasibility of this AuNCs-based sensor was further demonstrated by the assessment of kinase inhibition by ellagic acid, 5,6-dichlorobenzimidazole-1-β-D-ribofuranoside, emodin, and quercetin in human serum. As expected, the PL intensity increased with increasing inhibitor efficiency in the presence of inhibitors. The IC50 value (inhibitor concentration producing 50% inhibition) for ellagic acid was estimated to be 0.045 μM. With more sophisticated design of the peptide substrate sequences, the detection of other enzymes will be realized. With characteristics of homogeneous, facile, universal, label-free, and applicable for kinase assay, the proposed sensor provides potential application in kinase-related biochemical fundamental research and inhibitor screening.
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang 330031, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Song
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang 330031, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang 330031, PR China.
authors.forename: Ru-Ping
authors.initials: RP
authors.lastname: Liang
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang 330031, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang 330031, PR China. Electronic address: jdqiu@ncu.edu.cn.
authors.forename: Jian-Ding
authors.initials: JD
authors.lastname: Qiu
mesh_terms: D047390:Casein Kinase II / Q000032:analysis* / Q000737:chemistry*; D004789:Enzyme Activation; D004795:Enzyme Stability; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010455:Peptides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013194:Staining and Labeling
chemical_list: D010455:Peptides; D006046:Gold; D047390:Casein Kinase II
keywords: Gold nanoclusters; Inhibitor; Photoluminescence quenching; Protein kinase