Homogeneous Tyrosine Kinase Substrate Peptides
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Solution Overview
Problem
Current tyrosine kinase substrates, such as poly-(Glu-Ala-Tyr) and poly-(Glu, Tyr), are heterogeneous and unstable, making them challenging for use in assays due to variability in labeling and limited stability, especially in time-resolved fluorescence energy transfer (TR-FRET) assays.
Innovation Solution
Development of homogeneous tyrosine kinase substrate peptides with specific amino acid sequences (e.g., AYE AYE AYE K EYA EYA K AYA EYE) that are chemically stable and recognized by multiple tyrosine kinases, having a molecular weight range of 0.5 kD to 10 kD and comprising 2-25 phosphorylation modules with 2-3 amino acid residues, including glutamic acid and tyrosine residues, and optionally basic amino acids for improved solubility and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heterogeneous copolymer substrates (poly-EY or poly-EAY) are used, then broad recognition by multiple tyrosine kinases is achieved, but stability and homogeneity deteriorate
Solution Approach 1:
The patent applies homogeneity by replacing heterogeneous copolymer substrates with homogeneous peptide substrates of defined sequence and molecular weight. The peptide substrates consist of repeating phosphorylation modules (e.g., AYE, EYA, AYA) in a fixed arrangement, eliminating the size and compositional heterogeneity of random copolymers. This results in uniform labeling with dyes/fluorophores and consistent performance across assay batches while maintaining broad recognition by multiple tyrosine kinases.
2Adaptability or versatility
If heterogeneous copolymer substrates are used, then broad substrate recognition is achieved, but labeling variability increases
Solution Approach 1:
The homogeneous peptide substrate structure with defined sequence and molecular weight enables consistent and reproducible labeling with dyes, fluorophores, or tag groups. Each peptide molecule has identical phosphorylation module arrangements, ensuring uniform labeling efficiency and detectable signal across all substrate molecules, thereby improving manufacturing precision for assay production.
3Ease of operation
If copolymers are stored in aqueous buffer, then assay readiness is improved, but stability deteriorates requiring -80°C storage
Solution Approach 1:
The patent applies parameter changes by modifying the molecular weight and compositional homogeneity of the substrate. The peptide substrates have molecular weights in the range of 0.5-10 kDa (compared to 20-50 kDa for copolymers) with defined sequences. These parameter changes result in improved solubility and stability in aqueous buffers at physiological temperatures, eliminating the need for -80°C storage while maintaining functional stability and assay readiness.
4Adaptability or versatility
If heterogeneous copolymers are used, then generic substrate capability is achieved, but assay performance consistency deteriorates
Solution Approach 1:
The homogeneous peptide substrates with defined sequences and molecular weights provide consistent assay performance across different batches and experiments. The uniform structure ensures reliable and reproducible detection of tyrosine kinase activity, improving the reliability of kinase assays while maintaining the ability to serve as generic substrates for multiple kinases.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The peptides provide stable and efficient detection of tyrosine kinase activity with improved signal stability in TR-FRET assays, allowing for long-term storage and resistance to freeze-thaw cycles, and are recognized by a broad range of tyrosine kinases, enhancing assay reliability and consistency.
Implementation Method 1
Tyrosine kinases are a subgroup of the larger class of protein kinases and they function to transfer a phosphate group from ATP to a tyrosine residue in a protein.
Implementation Method 2
these heterogeneous mixtures of random co-polymers have limited stability in particular kinase assays, such as time-resolved fluorescence energy transfer (TR-FRET) kinase assays.
Data Source
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AI summary
Tyrosine kinase substrates are described herein that are phosphorylated by many and diverse tyrosine kinases, and are chemically stable relative to co-polymers of poly-EY or poly-EAY having random molecular weights in the range of 20-50 kDa. Tyrosine kinase substrate peptides are provided according to embodiments described herein which include an isolated tyrosine kinase substrate peptide having molecular weight in the range of about 0.5 kD - 10 kD. Tyrosine kinase substrate peptides are provided according to embodiments described herein having no more than 50 amino acids. The peptides include 2 - 25 phosphorylation modules and each phosphorylation module has 2-3 amino acid residues.