Amphotericin B Derivatives with Aromatic Amide Substitutions
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Solution Overview
Problem
Current antifungal treatments, particularly those using Amphotericin B, face challenges such as high toxicity, limited efficacy, and the emergence of resistant fungal strains, necessitating the development of derivatives with improved selectivity and reduced collateral toxicity for effective broad-spectrum antifungal activity.
Innovation Solution
Synthesis of polyene macrolide derivatives with specific modifications to the carboxyl group, such as substitution with tryptophan or histidine, to enhance interaction with fungal membranes while minimizing interaction with mammalian membranes, thereby optimizing antifungal activity and reducing toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Amphotericin B is used at higher concentrations to improve antifungal efficacy, then the antifungal activity increases, but the compound forms oligomers that precipitate in solution and toxicity increases
Solution Approach 1:
The patent modifies the chemical structure of Amphotericin B by replacing the carboxyl group with amide groups containing aromatic rings (such as tryptophan or histidine residues). This structural parameter change alters the compound's solubility characteristics and membrane interaction properties, enabling effective concentrations without precipitation while reducing toxicity to mammalian cells.
Solution Approach 2:
The invention introduces specific local modifications to the Amphotericin B molecule by substituting the carboxyl terminal with particular amide groups. These localized structural changes at the polar head region enhance selectivity for fungal membranes over mammalian membranes, improving therapeutic index while maintaining antifungal potency.
2Reliability
If the concentration of Amphotericin B is increased to achieve better antifungal activity, then the therapeutic effect improves, but the compound precipitates in solution
Solution Approach 1:
The patent changes the chemical parameters of Amphotericin B by introducing amide groups with aromatic rings at the carboxyl position. This modification alters the solubility profile of the compound, allowing it to remain in solution at higher concentrations necessary for effective antifungal therapy without forming precipitating oligomers.
Solution Approach 2:
The invention creates a hybrid molecular structure by combining the polyene macrolide core of Amphotericin B with amide groups containing aromatic residues. This composite structure integrates the antifungal properties of the original molecule with improved solubility characteristics derived from the aromatic amide moieties.
3Adaptability or versatility
If Amphotericin B is used to achieve broad-spectrum antifungal activity, then the coverage of fungal species improves, but collateral toxicity to human cells increases
Solution Approach 1:
The patent introduces local structural modifications at the polar head region of Amphotericin B by replacing the carboxyl group with aromatic amide groups. These localized changes enhance the compound's ability to differentiate between fungal and mammalian cell membranes, maintaining broad-spectrum antifungal activity while reducing collateral toxicity to human cells.
Solution Approach 2:
The invention modifies key chemical parameters of Amphotericin B, specifically the terminal carboxyl group, by converting it to amide groups with aromatic rings. This parameter change alters the electrostatic and hydrophobic interactions of the molecule, improving selectivity for fungal membranes and reducing toxicity to mammalian cells while preserving broad-spectrum activity.
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 resulting derivatives demonstrate enhanced antifungal potency against Candida species with reduced toxicity to human cells and erythrocytes, offering a more selective and safer treatment option compared to traditional Amphotericin B.
Implementation Method 1
substitution with tryptophan or histidine, to enhance interaction with fungal membranes
Implementation Method 2
substitution with tryptophan or histidine, to enhance interaction with fungal membranes
Data Source
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AI summary
The present invention relates to polyene macrolide derivatives according to the formula (I): wherein M is a macrocyclic lactone ring; N is a polyene sugar, substituted or unsubstituted; X is independently selected from O, S, N or NH; R is independently selected from an alkyl, cycloalkyl, heterocycloalkyl aryl, heteroaryl, arylalkyl, and heteroaryalkyl group; and i is an integer from 1 to 3, with the condition that it has a negative charge or the zwitterions character is restored; or a pharmaceutically acceptable salt thereof useful as antibiotics.