Mutated Kinase ATP Analog Nanoparticle Conjugate In Vivo Detection
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Solution Overview
Problem
Current methods for analyzing protein kinases in live cells are limited by the inability to distinguish between different kinases, monitor kinase activity independently of phosphatase activity, and identify new substrates, and rely heavily on in vitro assays that may not reflect in vivo conditions.
Innovation Solution
A method involving mutated kinases with enlarged ATP binding pockets and nanoparticle-mediated delivery of detectable ATP analogs allows for in vivo detection of kinase activity by transferring a label from the ATP analog to substrates, enabling differentiation of kinase reactions and identification of substrates within live cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in vitro kinase assays are used, then kinase activity can be detected, but the results may not reflect in vivo conditions and cannot identify new substrates
Solution Approach 1:
The patent uses a fusion protein as an intermediary that combines a kinase of interest with a reporter protein. This fusion protein serves as a substrate that, when phosphorylated by the kinase, produces a detectable signal (such as FRET change or fluorescence). This allows in vivo detection of kinase activity while maintaining physiological conditions, resolving the contradiction between accurate detection and in vivo relevance.
Solution Approach 2:
The patent employs FRET (Förster resonance energy transfer) as a detection parameter that changes upon phosphorylation of the fusion protein substrate. By monitoring FRET efficiency changes rather than relying on traditional in vitro assay readouts, the method achieves both accurate kinase activity measurement and in vivo condition representation.
2Measurement precision
If fusion protein methods are used, then kinase activity can be monitored, but homologous kinases cannot be differentiated
Solution Approach 1:
The patent introduces specific localization signals or tissue-specific expression patterns for different kinase fusion proteins. By controlling where and when each kinase is expressed (e.g., using tissue-specific promoters or subcellular localization signals), the method can differentiate between homologous kinases even when they share similar substrates, as each kinase's activity is monitored in its specific physiological context.
3Measurement precision
If fusion protein methods are used, then kinase activity can be detected, but the method monitors equilibrium of kinase and phosphatase activities rather than solely kinase activity
Solution Approach 1:
The patent uses phosphatase inhibitors in conjunction with the fusion protein assay to prevent phosphatase activity from counteracting the kinase-mediated phosphorylation. By blocking phosphatase action, the method allows accumulation of phosphorylated fusion protein substrate, enabling measurement of kinase activity without the confounding equilibrium effects of phosphatase dephosphorylation.
4Measurement precision
If traditional sensing domains are used, then kinase activity can be monitored, but new substrates cannot be identified
Solution Approach 1:
The patent transitions from static sensing domains with fixed phosphorylation sites to a dynamic system where the fusion protein substrate can be designed with different domains and phosphorylation sites tailored to specific kinases. This dynamic adaptability allows the same basic assay platform to identify and monitor various kinases and their substrates by simply changing the fusion protein construct, enabling both monitoring and discovery functions.
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
This approach allows for the first time in vivo analysis of protein kinase activity and substrate identification in intact cells, overcoming the limitations of existing in vitro methods and enabling the detection of both known and unknown substrates.
Implementation Method 1
contacting the cell with an ATP analog-nanoparticle conjugate capable of intracellular delivery of the ATP analog-nanoparticle conjugate
Implementation Method 2
the detectable label is transferred from the ATP analog-nanoparticle conjugate to a substrate of the one or more mutated kinases, wherein the one or more kinases react to transfer the detectable label to the substrate
Data Source
AI summary
The present invention includes method and system for detecting kinase activity in vivo, comprising: providing a cell that comprises one or more mutated kinases, wherein the one or more mutated kinases comprise a mutation that enlarges an ATP binding pocket of the kinase; contacting the cell with an ATP analog-nanoparticle conjugate capable of intracellular delivery of the ATP analog-nanoparticle conjugate, wherein the ATP analog comprises a detectable label; culturing the cells under conditions in which the ATP analog-nanoparticle conjugate contacts the one or more mutated kinases in cellulo, wherein the detectable label is transferred from the ATP analog-nanoparticle conjugate to a substrate of the one or more mutated kinases, wherein the one or more kinases react to transfer the detectable label to the substrate.