Plant Defense Signaling Peptides from PR-1 Precursor Cleavage

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Solution Overview

Problem

Current knowledge lacks comprehensive understanding and identification of defense signaling peptides in plants, particularly those involved in regulating anti-herbivore and anti-pathogen responses, which are crucial for enhancing stress tolerance and reducing agrochemical use in crop production.

Innovation Solution

A novel peptide elicitor derived from tomato pathogenesis-related protein 1 (PR-1) with a conserved 11-amino acid motif (PxGNxxxxxPY) is identified, which acts as a plant defense signaling peptide, and a 15-amino acid motif (CNYxPxGNxxxxxPY) is used to generate an active signaling peptide through specific cleavage by an endogenous protease, while a peptide with a CNYx motif can downregulate defense activity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If defense signaling peptides are derived from selective action of proteases on larger precursor proteins, then the peptides can be generated through natural processing, but the expression levels are low and the peptides are highly dynamic making them difficult to identify

Engineering Contradiction:

Improvepeptide generation through natural processingVSAvoidpeptide identification accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by using recombinant DNA technology to directly express and accumulate precursor proteins (like PR-1) in plant systems before proteolytic processing occurs. This allows the precursor proteins to be produced at high levels through transgenic expression, making them detectable and studyable before they are naturally processed into the low-abundance signaling peptides. The approach of accumulating precursor forms beforehand enables reliable identification of the peptide sources.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If only a few signaling peptides have been identified in plants compared to animals, then the complexity of plant peptide systems is lower, but this limits the understanding of plant intercellular communication and defense mechanisms

Engineering Contradiction:

Improvepeptide system complexityVSAvoidunderstanding of plant communication

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The patent applies universality by demonstrating that pathogenesis-related proteins like PR-1, traditionally known for their antimicrobial functions, also serve as precursors for defense signaling peptides. This multi-functionality reveals that existing plant proteins have dual roles: direct pathogen defense and signaling mediation. By identifying this universal principle, the patent enables discovery of multiple signaling peptides from single precursor proteins across different plant species, expanding understanding without requiring entirely new peptide systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Speed

If defense signaling peptides are expressed at low levels and are highly dynamic, then they can provide rapid response to stress, but they are difficult to detect and quantify in planta

Engineering Contradiction:

Improvestress response speedVSAvoidpeptide detection accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent applies the intermediary principle by using recombinant precursor proteins as mediators between the detectable state and the actual signaling peptide. The recombinant precursors serve as stable, detectable proxies that can be quantified using standard molecular biology techniques. These intermediaries allow researchers to measure peptide potential and dynamics without directly detecting the low-abundance, highly dynamic processed peptides, thus enabling quantification while preserving the rapid response characteristics of the native system.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 identified peptides effectively increase plant defense activity by inducing immune responses, such as H2O2 production and activation of anti-herbivore or anti-pathogen genes, providing enhanced resistance against biological threats and potentially improving crop productivity with reduced agrochemical use.

Implementation Method 1

a CNYx motif is critical to be recognized by an endogenous protease to cleave a precursor (e.g. a full length of PR-1) to generate an active plant defense signaling peptide

Methodology Applied

Scientific EffectProteolytic cleavage: Enzyme