Robust Split Inteins for Scalable Protein Purification
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Solution Overview
Problem
Current intein-mediated protein purification techniques face challenges in scalability and robustness, particularly in large-scale industrial applications, due to limitations in temperature range, salt tolerance, and sequence variability.
Innovation Solution
Development of robust split inteins that are active over a wide temperature range, tolerant to chaotropic salts, and capable of functioning with polypeptides of varying sequences, allowing for efficient protein purification and engineering through fusion proteins with specific intein domains and heterologous polypeptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current intein-mediated protein purification techniques are used, then protein purification can be achieved, but scalability and robustness are limited due to narrow temperature range, low salt tolerance, and restricted sequence variability
Solution Approach 1:
The patent applies parameter changes by engineering intein sequences with modified amino acid compositions that alter their physical-chemical properties. Specifically, the inteins are designed to function across a broad temperature range (4°C to 60°C) and tolerate chaotropic salts (up to 6M urea or 1M guanidine hydrochloride), representing significant changes from conventional inteins that are restricted to narrow temperature ranges and salt-free conditions. These parameter changes enable the inteins to maintain splicing activity under diverse industrial purification conditions.
Solution Approach 2:
The patent achieves universality by creating inteins that can function with polypeptides of varying sequences and under multiple environmental conditions simultaneously. The engineered inteins demonstrate tolerance to sequence variability in fused heterologous polypeptides, allowing them to be applied to purify different target proteins without re-optimization. This multi-functionality includes temperature adaptability, salt tolerance, and sequence flexibility, making the intein system universally applicable to various industrial protein purification scenarios.
2Productivity
If conventional inteins are used for protein splicing, then splicing activity can be achieved, but high-yielding reactions cannot be obtained across broad temperature ranges and in the presence of salts
Solution Approach 1:
The patent achieves high productivity across diverse environmental parameters by engineering inteins with enhanced stability and catalytic efficiency. The modified intein sequences maintain high splicing reaction yields (exceeding 90% in many cases) whether the reaction is performed at 4°C, 25°C, 37°C, or 60°C, and whether 0M, 1M, or 6M urea is present. This represents a fundamental parameter change from conventional inteins that lose activity outside narrow conditions.
Solution Approach 2:
The patent applies dynamics by creating inteins that can adapt their function across varying environmental conditions. The engineered inteins dynamically maintain splicing activity regardless of temperature fluctuations or salt concentrations, allowing the same intein construct to achieve high yields under different industrial processing conditions without requiring condition-specific optimization.
3Manufacturing precision
If intein-mediated purification is performed with strict condition control, then splicing efficiency can be maintained, but scalability to large-scale industrial applications is limited
Solution Approach 1:
The patent resolves the scalability challenge by changing the parameter requirements for efficient splicing. Conventional inteins require precise control of temperature (narrow range) and absence of salts, whereas the engineered inteins maintain high splicing efficiency (above 90%) under relaxed conditions including broad temperature ranges (4-60°C) and high salt concentrations (up to 6M urea). This parameter change eliminates the need for strict condition control during large-scale manufacturing.
Solution Approach 2:
The patent applies this principle by designing inteins that function effectively under non-ideal, industrially-relevant conditions without requiring expensive purification steps or precise environmental control. The inteins tolerate the presence of chaotropic salts that are commonly used in industrial protein purification protocols, eliminating the need for additional dialysis or desalination steps that would increase cost and complexity at scale.
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 robust split inteins enable high-yielding protein splicing reactions across a broad temperature range and in the presence of salts, facilitating efficient protein purification and engineering with improved scalability and flexibility.
Implementation Method 1
Inteins are internal protein elements that self-excise from their host protein and catalyze ligation of the flanking sequences (exteins) with a peptide bond. Intein excision is a posttranslational process that does not require auxiliary enzymes or cofactors. This self-excision process is called 'protein splicing'
Data Source
AI summary
The present invention relates generally to robust split inteins. The split inteins described herein are active over a large temperature range, including temperatures as low as 0° C., over a wide pH range, and in the presence of chaotropic salts. The split inteins also show high tolerance to sequence variability in fused heterologous polypeptides and therefore are useful in protein purification and engineering techniques.