Glycine-Rich Peptide PgAMP1 Antibacterial Activity Against Gram-Negative Bacteria

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Solution Overview

Problem

The increasing resistance of gram-negative bacteria, such as Klebsiella sp. and Proteus sp., to synthetic antibiotics poses a significant challenge in treating urinary and gastrointestinal infections, particularly in immunocompromised patients, necessitating the development of new antimicrobial agents.

Innovation Solution

A new peptide, PgAMP1, extracted from guava seeds with a specific amino acid sequence, belonging to the glycine-rich protein class, is purified and characterized for its bactericidal activity against these pathogens, offering a novel strategy to combat antibiotic resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If synthetic antibiotics are used to treat gram-negative bacteria infections, then bacterial infections can be treated, but bacterial resistance to antibiotics increases

Engineering Contradiction:

Improveeffectiveness of antibiotic treatmentVSAvoidbacterial resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and isolates a specific antimicrobial peptide (PgAMP1) from guava seeds, separating the active antimicrobial component from the plant matrix. This extracted peptide can then be used as a targeted therapeutic agent against gram-negative bacteria without the resistance issues associated with broad-spectrum synthetic antibiotics.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the chemical parameter of the antimicrobial agent from synthetic compounds to a naturally derived peptide with specific amino acid sequence characteristics (rich in glycine, tyrosine, and phenylalanine). This parameter change results in a substance that bacteria have not developed resistance against yet, while maintaining effective antimicrobial activity.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If plant proteins are used as antimicrobial agents, then new antimicrobial activity can be discovered, but the specific activity against different bacteria varies

Engineering Contradiction:

Improverange of antimicrobial activityVSAvoidspecific inhibitory activity against target bacteria

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent identifies specific local quality characteristics in the peptide structure - a particular amino acid sequence pattern rich in glycine, tyrosine, and phenylalanine residues. This localized structural feature is responsible for the peptide's antimicrobial activity, allowing optimization of the molecule for specific bacterial targets while maintaining the natural plant-derived framework.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8445428B2Plant derived antibiotic peptide rich in glycine

Publication Date: 2013.05.21 EMPRESA BRASILEIRA DE PESQUISA AGROPECUARIA EMBRAPA

AI summary

The present invention relates to a novel peptide extracted from guava (Psidium guajava) seeds, that provides bactericide activity, Preferentially against Gram-negative bacteria which are known to cause urinary, hospital, and intestinal tract infections (Proteus sp. And Klebsiella sp.). The peptide, that has the amino acid sequence RESPSSRMEC YEQAERYGYG GYGGGRYGGG YGSGRGQPVG QGVERSHDDN RNQPR, belongs to the class of glycine rich proteins and has approximately 5 kDa of molecular weight. The invention also relates to antibiotic compositions for human, veterinary and plant treatments. Alternatively, the peptide, or a functionally similar derivative, subjects of the present invention, can be used for transforming organisms aiming pathogen resistance, other adaptive advantages, as well as various properties, specially for plants and animals.