Sortase-Catalyzed Bioconjugate Synthesis via Transpeptidation
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Solution Overview
Problem
Current methods for synthesizing glycoconjugates involving sugars and polypeptides are complex and demanding, requiring extensive protection of reactive functionalities and multiple reaction steps, making the process challenging for the 'convergent' semisynthesis of glycopeptides or protein mimetics with desirable biological properties.
Innovation Solution
Utilization of the bacterial transpeptidase sortase to catalyze a novel sortase-catalyzed transpeptidation reaction between substrates containing the LPXTG peptide motif and biomolecules like aminosugars, hydroxyamino acids, and polyamines, forming amide bonds without the need for ATP or extraneous molecules, facilitating the preparation of bioconjugates suitable for therapeutic and diagnostic applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chemical methods are used to synthesize glycoconjugates, then covalent linking of sugars to peptides or proteins can be achieved, but the synthesis becomes complex and demanding with multiple reaction steps and extensive protection of reactive functionalities
Solution Approach 1:
The patent employs an enzyme (transpeptidase or sortase) as an intermediary to catalyze the covalent linking reaction between the sugar substrate and peptide/protein substrate. The enzyme provides a specific active site that facilitates amide bond formation without requiring protective groups or multiple chemical steps, thereby simplifying the synthesis process while maintaining reliable covalent linking
Solution Approach 2:
The patent replaces complex chemical synthesis mechanisms with a biological enzymatic mechanism. Instead of using chemical reagents and protective groups to control reactivity, the system uses the enzyme's active site to selectively catalyze the reaction between specific substrates, substituting chemical complexity with biological specificity
2Ease of manufacture
If enzyme-mediated transpeptidation is used to simplify glycoconjugate synthesis, then the number of reaction steps is reduced, but specific substrate requirements (LPXTG motif) must be met
Solution Approach 1:
The patent applies local quality by introducing the LPXTG motif only at the C-terminus of the peptide or protein substrate where it is needed for enzyme recognition. This localized modification allows the rest of the molecule to maintain its native structure and function, while providing the specific recognition sequence required for enzymatic catalysis
3Adaptability or versatility
If sortase-catalyzed ligation is used for protein engineering, then protein-peptide conjugates can be synthesized that are difficult to obtain by chemical or genetic methods, but the reaction requires specific sequence motifs
Solution Approach 1:
The patent segments the substrate into two functional parts: the LPXTG recognition motif that interacts with the enzyme, and the functional payload (peptide, protein, or conjugate target) that provides the desired biological activity. This segmentation allows independent optimization of enzyme recognition and functional properties
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 synthesis of bioconjugates by enabling efficient ligation of peptides and biomolecules, producing bioconjugates with potential therapeutic and diagnostic applications, such as enhanced antibiotic delivery and HIV replication inhibition, while avoiding the complexity of traditional chemical or genetic methods.
Implementation Method 1
The transpeptidation reaction proceeds in two steps without the aid of ATP or any other extraneous molecule; active site cysteine residue first attacks the target LPXTG (SEQ ID NO: 11) substrate forming and acyl-enzyme intermediate which in the second step is resolved by the nucleophilic attack of the amino group of terminal Gly residue of the peptidoglycan
Implementation Method 2
The bacterial transpeptidase sortase, present in the cell envelop of most gram-positive organisms, catalyzes the covalent anchoring of several virulence-related bacterial surface proteins to the peptidoglycan cross-bridges of the cell wall
Data Source
AI summary
The present disclosure relates to a novel enzymatic approach according to the invention using an unprecedented sortase-catalyzed transpeptidation reaction between a substrate comprising LPXTG (SEQ ID NO: 11) peptide motif and biomolecules such as aminosugars, hydroxyamino acids, hydroxyamino acid esters, aminolipids, polyamines; nucleic acids or derivatives thereof; or any molecule having such moieties; or any compound having such moieties to obtain a bioconjugates useful for target delivery of a compound. The present disclosure provides bioconjugates obtained by the novel sortase catalysed transpeptidedation reaction.