Fusion Natriuretic Peptides Prolonging Action Duration
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Solution Overview
Problem
Current methods lack effective solutions for inducing natriuretic or diuretic activity in mammals, particularly in addressing sodium retention disorders, with existing natriuretic polypeptides having limitations in duration and efficacy.
Innovation Solution
Development of substantially pure polypeptides and nucleic acids encoding sequences for natriuretic peptides, such as ANP, BNP, CNP, and salmon natriuretic factor, with modifications like additions, subtractions, and substitutions, administered to induce natriuretic or diuretic action in mammals, utilizing techniques like affinity chromatography and HPLC for purification and transgenic sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If native natriuretic polypeptides are administered, then natriuretic activity is induced, but the duration of action is limited and efficacy is insufficient
Solution Approach 1:
The invention extracts and extends the C-terminus of native natriuretic polypeptides by fusing them with heterologous peptide sequences. This extraction of the active natriuretic core and addition of extending sequences creates fusion proteins with prolonged duration of action while maintaining natriuretic efficacy.
Solution Approach 2:
The invention creates composite polypeptide structures by fusing native natriuretic peptide sequences with heterologous peptide sequences. These composite fusion proteins combine the natriuretic activity of the native peptide with the prolonged circulation properties of the heterologous extension, achieving both improved efficacy and extended duration.
2Manufacturing precision
If purification methods like affinity chromatography and HPLC are used, then substantially pure polypeptides are obtained, but the manufacturing process becomes complex
Solution Approach 1:
The invention introduces affinity tags as intermediary sequences during the purification process. These tags facilitate selective binding and recovery of the recombinant polypeptides through affinity chromatography, simplifying the purification process while achieving high purity levels. The tags act as mediators between the target polypeptide and the purification matrix.
3Duration of action of moving object
If amino acid modifications are made to extend C-terminus, then duration of action is prolonged, but the polypeptide structure becomes more complex
Solution Approach 1:
The invention segments the polypeptide into distinct functional domains: an N-terminal region containing the native natriuretic active sequence and a C-terminal region containing heterologous extending sequences. This segmentation allows the molecule to perform multiple functions - maintaining natriuretic activity while extending duration of action through the additional sequences.
Solution Approach 2:
The heterologous C-terminal extensions serve multiple functions: they prolong the duration of action by reducing renal clearance, maintain stability of the fusion protein, and can include affinity tags for purification. This multi-functionality achieves extended duration without proportionally increasing structural complexity.
Data Source
AI summary
This document provides methods and material related to natriuretic polypeptides. For example, substantially pure polypeptides having a natriuretic peptide activity, nucleic acids encoding polypeptides having a natriuretic peptide activity, host cells containing such nucleic acids, and methods for inducing a natriuretic or diuretic activity within a mammal are provided.