Aminopeptidase Cleaving Reagents for Direct Polypeptide Sequencing
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Solution Overview
Problem
Next-generation DNA sequencing technologies have struggled to capture the complex and dynamic states of cells due to the scale and inability to amplify proteins effectively, limiting our understanding of proteomics.
Innovation Solution
A composition comprising aminopeptidases from Streptomyces griseus and Pyrococcus horikoshii, with specific amino acid sequences and tag sequences, is used to cleave N-terminal amino acids from polypeptides, enabling efficient polypeptide analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If DNA sequencing technologies are used to study cellular processes, then genetic information can be obtained, but the complex and dynamic states of cells cannot be fully captured due to inability to amplify proteins
Solution Approach 1:
The patent introduces an intermediary system consisting of amino acid binding proteins and cleaving reagents that bridge the gap between polypeptide analysis and detection. The binding proteins specifically recognize and bind to amino acids, while the cleaving reagents sequentially remove N-terminal amino acids, creating a detectable signal that reveals polypeptide sequence information without requiring protein amplification.
Solution Approach 2:
The patent replaces the mechanical/biological amplification process used in DNA sequencing with a chemical sequencing mechanism. Instead of amplifying genetic material through PCR or similar methods, the system uses chemical cleavage by aminopeptidases to sequentially expose and detect amino acids, enabling direct analysis of proteins without amplification.
2Measurement precision
If conventional sequencing methods are applied to polypeptides, then sequence information can be obtained, but the process is slow and lacks accuracy due to inability to amplify source material
Solution Approach 1:
The patent implements continuous sequencing by maintaining the polypeptide in a bound state on the surface and using sequential cleavage cycles with the same binding protein and cleaving reagent combination. Each cycle removes one N-terminal amino acid and allows detection of the next, creating a continuous readout process that is both rapid and accurate without requiring re-binding or re-positioning steps.
Solution Approach 2:
The system uses the polypeptide itself as the template for sequencing. The bound polypeptide automatically presents its N-terminal amino acid for recognition by the binding protein, and the cleaving reagent automatically removes the exposed amino acid, creating a self-directed sequencing process that eliminates the need for external manipulation or amplification steps.
3Adaptability or versatility
If multiple amino acid types are present at N-terminus, then diverse polypeptides can be analyzed, but cleavage efficiency decreases due to varying binding affinities
Solution Approach 1:
The patent employs multiple different amino acid binding proteins, each with different binding specificities and affinities for particular amino acids. By selecting and using different binding proteins in sequence or combination, the system can efficiently recognize and bind to various N-terminal amino acids, maintaining high cleavage efficiency across diverse polypeptide sequences.
Solution Approach 2:
The system creates a universal sequencing platform that can handle all 20 standard amino acids by using a set of binding proteins with complementary specificities. Each binding protein in the set is optimized for particular amino acid types, and together they provide universal coverage, allowing the same cleaving reagent system to efficiently process any polypeptide regardless of its N-terminal composition.
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 solution enables rapid and accurate polypeptide sequencing by monitoring signal pulses from amino acid binding proteins, providing detailed insights into cellular processes.
Implementation Method 1
a cleaving reagent that comprises an aminopeptidase from Streptomyces griseus
Implementation Method 2
cleave N-terminal amino acids from polypeptides
Data Source
AI summary
There is provided amino acid cleaving reagents with improved cleavage activity, allowing for more structural information to be obtained from polypeptides in sequencing reactions.