Tubulin-tyrosine ligase fusion enzyme for polypeptide functionalization
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Solution Overview
Problem
Current methods for site-specific post-translational modifications of proteins are time- and material-consuming, making it challenging to engineer proteins with specific adaptations post-translation, particularly due to the limited substrate specificity of enzymes like tubulin-tyrosine ligase (TTL), which was thought to only act on tubulin substrates.
Innovation Solution
The discovery that tubulin-tyrosine ligase (TTL) can tyrosinate heterologous substrates with a TTL recognition sequence at their C-terminus, allowing for the functionalization of various polypeptides by introducing a tyrosine or tyrosine derivative, enabling the attachment of moieties like labels or therapeutic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional site-specific modification methods are used, then modification precision is improved, but time consumption and material usage increase
Solution Approach 1:
The patent applies universality by engineering a multifunctional protein that combines the catalytic activity of tubulin-tyrosine ligase with the substrate recognition capability of tubulin. This fusion enzyme can directly modify target proteins at specific sites without requiring separate recognition and modification steps, thereby reducing time consumption while maintaining site-specific precision.
Solution Approach 2:
The invention merges the TTL enzyme domain with the tubulin recognition domain to create a fusion protein. This combining of functions into a single reagent eliminates the need for separate incubation steps with different enzymes or ligands, reducing both time and material usage while achieving precise site-specific modification.
2Manufacturing precision
If traditional site-specific modification methods are used, then modification precision is improved, but process complexity increases
Solution Approach 1:
The fusion enzyme serves multiple functions simultaneously: it recognizes the target protein through the tubulin domain and catalyzes the tyrosination reaction through the TTL domain. This multi-functionality in a single reagent simplifies the overall process by eliminating the need for multiple separate reagents and steps.
Solution Approach 2:
The invention extracts the essential recognition and catalytic functions from separate biological systems and combines them into a single engineered protein. This extraction and recombination approach creates a simplified system that maintains the precision of site-specific modification without the complexity of coordinating multiple separate processes.
3Adaptability or versatility
If TTL is used with heterologous substrates, then substrate versatility is improved, but enzyme specificity decreases
Solution Approach 1:
The fusion enzyme maintains local quality by preserving the specific tubulin recognition domain that provides precise substrate recognition. This localized recognition capability ensures that the enzyme only modifies proteins with the appropriate tubulin-like sequences, maintaining specificity even while expanding the overall substrate range to include various heterologous proteins.
Solution Approach 2:
The invention achieves versatility through the universal applicability of the tubulin recognition domain, which can identify similar motifs in different proteins. The TTL catalytic domain then universally performs the tyrosination reaction on any recognized substrate, thereby expanding substrate range while maintaining reliable specificity through the conserved recognition mechanism.
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 approach simplifies the functionalization of proteins by expanding the substrate range of TTL, allowing for efficient and versatile post-translational modifications of non-tubulin polypeptides, enhancing research, diagnostic, and therapeutic applications.
Implementation Method 1
contacting the polypeptide obtained in step (a) in the presence of tubulin tyrosine ligase and a tyrosine derivative under conditions suitable for the tubulin tyrosine ligase to tyrosinate said polypeptide with said tyrosine derivative
Data Source
AI summary
The present invention provides means and methods for equipping a polypeptide of interest at its C-terminus with a versatile adaptor amino acid that allows the functionalization of the polypeptide of interest.