ATP-Polyamine-Biotin Analog for Live Cell Kinase Biotinylation
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Solution Overview
Problem
Current ATP analogs, such as ATP-biotin, are impermeable to living cells, limiting their use in studying protein kinases and phosphorylation pathways in physiologically relevant conditions.
Innovation Solution
A cell-permeable ATP-biotin analog, ATP-polyamine-biotin (APB), is developed by replacing the PEG linker with a polyamine linker, specifically spermine, which is positively charged under physiological conditions, enhancing membrane permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ATP-biotin is used for kinase-catalyzed biotinylation, then biotinylation efficiency is improved, but cell permeability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the ATP-biotin analog by replacing the PEG linker with a polyamine linker (spermine). This parameter change modifies the charge properties of the molecule, making it positively charged under physiological conditions, which enables it to cross the negatively charged cell membrane while maintaining kinase acceptability and biotinylation functionality.
Solution Approach 2:
The patent creates a composite molecule (ATP-polyamine-biotin) that combines three functional components: the ATP moiety (recognized by kinases), the polyamine linker (provides cell permeability through positive charge), and the biotin group (enables detection and purification). This composite structure resolves the contradiction by integrating multiple functions into a single molecule.
2Stability of the object's composition
If a PEG linker is used in ATP-biotin, then structural stability is improved, but cell permeability deteriorates
Solution Approach 1:
The patent changes the chemical parameter of the linker from PEG (neutral, hydrophilic) to polyamine (positively charged at physiological pH). This parameter change fundamentally alters the interaction with the cell membrane, enabling permeability while the linker still provides structural connection between ATP and biotin groups.
Solution Approach 2:
The patent converts the typically harmful effect of positive charge (which can cause non-specific binding and toxicity) into a beneficial feature for cell permeability. The positively charged polyamine linker exploits the electrostatic interaction with the negatively charged cell membrane to facilitate entry, turning a potential disadvantage into an advantage.
3Ease of operation
If ATP-polyamine-biotin is used for live cell biotinylation, then cell permeability is improved, but reaction efficiency deteriorates
Solution Approach 1:
The patent accepts partial loss of reaction efficiency as a trade-off for achieving cell permeability. The ATP-polyamine-biotin analog is designed to be sufficiently accepted by kinases to enable biotinylation in live cells, even if the rate is lower than with ATP-biotin in vitro. This partial action approach allows the method to function in the more challenging live cell environment.
Solution Approach 2:
The patent uses a modified ATP analog that is readily degraded after use, allowing cells to be treated with the analog without long-term persistence. The transient nature of the analog enables permeability and function while minimizing potential toxicity or interference with normal cellular processes after the experiment.
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
APB allows for kinase-catalyzed biotinylation in live cells, facilitating the study of protein kinases and phosphorylation pathways, with demonstrated cell permeability and nontoxicity at low concentrations, although with reduced efficiency compared to ATP or ATP-biotin.
Implementation Method 1
the polyamine linker will be positively charged under physiological conditions to partially neutralize the triphosphate charge and promote cell permeability
Data Source
AI summary
A cell permeable ATP analog has the following formula:or a physiologically acceptable salt thereof,wherein:R0 isn, o, p are each independently 1, 2, 3, 4, 5, or 6, m is 0, 1, 2, 3, 4, or 5; X is O, S, NH, or CH2. R1 is H or C1-6 alkyl, R2 is H, C1-6 alkyl, C6-30 aryl, C5-32 heteroaryl, or C7-32 alkylaryl; R3, R4 are each independently H, C1-6 alkyl, C6-30 aryl, C5-32 heteroaryl, or C7-32 alkylaryl, wherein R3, and R4 can be combined together to form a ring structure.