DNA Barcoded Protein Array for Single-Molecule Interaction Profiling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for high-throughput protein analysis, such as yeast-two-hybrid screening and protein microarrays, are limited by ensemble measurements that require individual analyte separation or enrichment, compromising throughput and cost-effectiveness.
Innovation Solution
The development of DNA barcoded protein array technology, which uses ribosome display or enzymatic conjugation to attach barcodes to proteins, allows for parallel protein interaction profiling on a single molecule basis. Barcoded proteins are immobilized in a polyacrylamide thin film, and barcoding DNAs are amplified into in situ polymerase colonies for analysis by DNA sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ensemble measurements are used for high-throughput protein analysis, then throughput can be improved, but measurement precision deteriorates due to the need for individual analyte separation or enrichment
Solution Approach 1:
The invention segments the measurement process by attaching unique DNA barcodes to individual protein molecules. This allows each protein to be individually tracked and quantified within an ensemble measurement, resolving the contradiction by enabling both high throughput (measuring many proteins simultaneously) and high precision (tracking individual molecules through their unique barcodes)
Solution Approach 2:
The invention creates a DNA barcode copy for each protein molecule, which serves as a unique identifier. This copying approach allows the protein to be tracked through sequencing methods, enabling precise quantification of individual molecules within large ensembles, thus achieving both high throughput and measurement precision
2Measurement precision
If individual analyte separation or enrichment is performed, then measurement precision is improved, but device complexity and cost-effectiveness worsen
Solution Approach 1:
The invention extracts the identification function from complex separation procedures by attaching DNA barcodes directly to proteins. Instead of using complex devices to separate and identify individual analytes, the barcode serves as a built-in identifier that can be read through sequencing, dramatically simplifying the device complexity while maintaining measurement precision
Solution Approach 2:
The DNA barcode acts as an intermediary between the protein molecule and the detection system. Rather than requiring complex devices to directly detect and identify individual proteins, the barcode serves as a simple, readable intermediary that links the protein to its identity, reducing device complexity while preserving measurement precision
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 method enables precise quantification of various proteins with a throughput of over one billion molecules per array, allowing for the measurement of protein interactions based on statistical analysis of co-localized polonies, and facilitates library vs. library screening in a single assay.
Implementation Method 1
performing in vitro translation of the mRNA-cDNA hybrid sequences to generate a plurality of protein-ribosome-mRNA-cDNA complexes
Implementation Method 2
barcoding DNAs are amplified into in situ polymerase colonies (polonies)
Data Source
AI summary
Methods for attaching barcodes to polypeptides are provided. Methods for detecting molecular interactions at the single molecule level are provided. Embodiments of the invention are directed to a ONA barcoded protein array technology for parallel protein interaction profiling on a single molecule basis. DNA barcodes are attached to proteins collectively via ribosome display or individually via enzymatic conjugation. Novel methods are described herein that measure protein interactions based on the statistical analysis of co-localized polonies arising from barcoding DNAs of interacting proteins.