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A Structural Bridge Between Kingdoms: How Collagen-Derived Peptides Influence Plant Stress and Growth Pathways.

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Collagen-derived protein hydrolysates (CDPH) enhance plant growth by promoting root development. This study identifies potential plant proteins that may interact with CDPH, offering a molecular basis for their biostimulant effects.

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abiotic stresscollagen‐derived biostimulantplant collagen‐binding proteinsroot development

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Area of Science:

  • Plant Science
  • Molecular Biology
  • Biochemistry

Background:

  • Collagen-derived protein hydrolysates (CDPH) are recognized as effective plant biostimulants, primarily due to their bioactive oligopeptide content.
  • CDPH application in hydroponic Solanum lycopersicum (tomato) cultivation significantly enhances root development, specifically increasing lateral root formation.

Purpose of the Study:

  • To investigate the molecular mechanisms behind CDPH's biostimulant activity.
  • To identify plant proteins within Arabidopsis thaliana that may interact with collagen-like peptides found in CDPH.

Main Methods:

  • A homology search was performed on the Arabidopsis thaliana proteome.
  • A Hidden Markov model (HMM) approach was utilized, based on human collagen-binding proteins (CBPs) and collagen-binding domains (CBDs).
  • Putative collagen-binding proteins in Arabidopsis were identified and characterized through sequence homology analysis.

Main Results:

  • Ten putative collagen-binding proteins were identified in Arabidopsis thaliana.
  • At5-MMP, a matrix metalloproteinase, showed high homology (44% identity) to human HsMMP1.
  • AtSERPIN1 exhibited a strong e-value match to human HsSERPINH1, indicating potential collagen-binding capability.
  • Identified proteins are involved in stress responses, aligning with known CDPH biostimulant effects.

Conclusions:

  • Plants possess proteins capable of recognizing collagen-like structures.
  • This interaction provides a plausible molecular mechanism for the observed biostimulant effects of CDPH.
  • Findings pave the way for future biochemical validation of CDPH-plant protein interactions.