Chimeric Alkaline Phosphatase for Low-Zinc Enzyme Activity
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Solution Overview
Problem
Existing alkaline phosphatases are limited by their dependence on zinc ions for activity, leading to reduced efficacy in environments with low zinc concentrations, such as inflammatory and inflammatory diseases, and lack of stability in storage and substrate specificity.
Innovation Solution
A modified alkaline phosphatase with specific amino acid modifications at positions 279, 328, and 478, enhancing its activity and stability in low zinc conditions, and improved substrate specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing alkaline phosphatases are used, then they show phosphatase activity in normal zinc conditions, but their activity is reduced in environments with low zinc concentrations
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues in the alkaline phosphatase sequence (positions 279, 328, and 478) to alter the enzyme's metal ion coordination properties. These substitutions change the chemical parameters of the active site, enabling the enzyme to function with reduced zinc dependence while maintaining catalytic activity in low zinc environments.
Solution Approach 2:
The invention creates a composite enzyme structure by combining modified amino acid sequences from different sources or creating chimeric constructs that integrate domains with different metal ion affinities. This composite approach allows the enzyme to maintain stability and activity across varying zinc concentrations by leveraging the properties of different structural components.
2Stability of the object's composition
If existing alkaline phosphatases are used, then they are available from natural sources, but they lack stability in storage and have limited substrate specificity
Solution Approach 1:
The patent modifies physical and chemical parameters of the alkaline phosphatase protein through amino acid substitutions that enhance structural stability. These changes affect the enzyme's folding, solubility, and resistance to denaturation during storage, while the modified sequences can be produced through recombinant expression methods.
Solution Approach 2:
The invention segments the alkaline phosphatase protein into distinct domains or modular units that can be independently optimized for stability. By dividing the protein structure into functional segments, each can be engineered for specific properties such as storage stability, while maintaining overall enzymatic function through proper domain reassembly.
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 modified alkaline phosphatase maintains enzymatic activity in low zinc environments, effectively targeting and treating inflammatory diseases and conditions with zinc deficiency, including autoimmune diseases, kidney diseases, and hypophosphatasia, with improved pharmacokinetic behavior and reduced immunogenicity.
Implementation Method 1
A phosphatase is an enzyme that dephosphorylates its substrates; i.e. it hydrolyses phosphoric acid monoesters into a phosphate ion and a molecule with a free hydroxyl group
Implementation Method 2
Metallo-phosphatases typically co-ordinate 2 catalytically essential metal ion(s) within their active site. It is thought that a hydroxyl ion bridging the two metal ions takes part in nucleophilic attack on the phosphate group
Data Source
AI summary
The invention relates to improved alkaline phosphatases, pharmaceutical compositions comprising improved alkaline phosphatases and the use of improved alkaline phosphatases for preventing, treating or curing diseases.