Modified Ligand-Gated Ion Channels for Selective Exogenous Control

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Solution Overview

Problem

Existing technologies struggle to control the levels of endogenous ligands such as acetylcholine (ACh) in ion channels, leading to uncontrolled ion transport and cellular excitability, which can result in unwanted activation and side effects.

Innovation Solution

Modified ligand-gated ion channels (LGICs) with specific amino acid substitutions in the ligand binding domain (LBD) and ion pore domain (IPD) are developed to increase sensitivity to exogenous ligands and reduce sensitivity to endogenous ligands, allowing for selective control over ion transport and cellular excitability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If modified LGICs with amino acid substitutions are used to increase sensitivity to exogenous ligands, then the potency and selectivity of exogenous ligand control is improved, but the complexity of the ion channel structure increases

Engineering Contradiction:

Improveselectivity of exogenous ligand controlVSAvoidion channel structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing specific amino acid substitutions at targeted positions within the ligand binding domain and ion pore domain, rather than modifying the entire channel structure. This localized modification approach achieves selective ligand recognition while preserving the overall channel architecture and minimizing structural complexity increases.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by systematically varying amino acid residues at specific positions (e.g., positions 77, 79, 131, 139, 141, 175, 216 in the LBD) to optimize ligand binding properties. These parameter modifications enable fine-tuning of exogenous ligand sensitivity and selectivity without requiring complete structural redesign of the ion channel.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If modified LGICs reduce sensitivity to endogenous ligands, then unwanted activation and side effects are reduced, but the ability to control ion transport naturally is diminished

Engineering Contradiction:

Improveunwanted activation and side effectsVSAvoidnatural ion transport control

Core Design Contradiction:

Object-generated harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent applies segmentation by functionally separating the response to endogenous versus exogenous ligands through targeted amino acid substitutions. The modifications create a segmented recognition system where the LBD selectively distinguishes between endogenous ligands (reduced sensitivity) and exogenous ligands (enhanced sensitivity), allowing independent control of these two pathways.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs inversion by reversing the typical ligand sensitivity pattern. Instead of the wild-type channel being sensitive to endogenous ligands and less sensitive to exogenous ones, the modified channel inverts this relationship by reducing endogenous ligand sensitivity while dramatically increasing exogenous ligand sensitivity, thereby gaining control precision.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If amino acid substitutions are introduced to enhance exogenous ligand potency, then temporal and spatial control of ion transport is improved, but the manufacturing and characterization complexity increases

Engineering Contradiction:

Improvetemporal and spatial control efficiencyVSAvoidchannel production and characterization

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent utilizes parameter changes by defining specific amino acid substitutions at predetermined positions to achieve desired ligand binding characteristics. This systematic parameter approach enables standardized production of modified channels with predictable properties, facilitating manufacturing while maintaining enhanced temporal and spatial control capabilities.

Inventive Principle:

Principle #35Parameter changes

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 modified LGICs provide temporal and spatial control of ion transport and cellular excitability, minimizing side effects by enhancing the potency of exogenous ligands and reducing cross-reactivity with endogenous channels.

Implementation Method 1

Methodology Applied

Scientific EffectLigand binding: Absorption (physical)

Implementation Method 2

allowing for selective control over ion transport and cellular excitability

Methodology Applied

Scientific EffectIon transport: Diffusion

Data Source

PatentUS12570705B2Modified ligand-gated ion channels and methods of use

Publication Date: 2026.03.10 HOWARD HUGHES MEDICAL INST

AI summary

This document relates to materials and methods for controlling ligand gated ion channel (LGIC) activity. For example, modified LGICs including at least one LGIC subunit having a modified ligand binding domain (LBD) and/or a modified ion pore domain (IPD) are provided. Also provided are exogenous LGIC ligands that can bind to and activate the modified LGIC, as well as methods of modulating ion transport across the membrane of a cell of a mammal, methods of modulating the excitability of a cell in a mammal, and methods of treating a mammal having a channelopathy.