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Updated: Jan 20, 2026
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Molecular basis for functional diversity among microbial Nep1-like proteins
Tea Lenarčič1, Katja Pirc1, Vesna Hodnik1,2
1Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Hajdrihova, Ljubljana, Slovenia.
Plos Pathogens
|September 4, 2019
Summary
Necrosis and ethylene-inducing peptide 1-like proteins (NLPs) cause plant cell death. This study shows that limited flexibility in HaNLP3 protein binding cavities prevents GIPC interaction, explaining its non-toxic nature.
Area of Science:
- Plant Pathology
- Molecular Biology
- Structural Biology
Background:
- Necrosis and ethylene-inducing peptide 1-like proteins (NLPs) are secreted by phytopathogenic microorganisms.
- NLPs induce necrosis in eudicot plants by binding to glycosylinositol phosphorylceramides (GIPCs).
- HaNLP3 from Hyaloperonospora arabidopsidis is a non-necrotic NLP.
Purpose of the Study:
- Determine the crystal structure of HaNLP3.
- Investigate the structural and dynamic basis for HaNLP3's lack of toxicity.
- Identify determinants for functional diversification of NLPs.
Main Methods:
- Crystal structure determination of HaNLP3.
- Comparison with cytotoxic NLPs (e.g., NLPPya).
- Microsecond molecular dynamics (MD) simulations to analyze protein dynamics.
Main Results:
- HaNLP3 shares the conserved NLP fold but exhibits different loop conformations around the GIPC-binding cavity.
- HaNLP3 possesses limited conformational plasticity in its GIPC-binding cavity compared to toxic NLPs.
- This reduced flexibility likely prevents GIPC binding, explaining the non-toxic phenotype.
Conclusions:
- Protein flexibility is a key differentiator between toxic and non-toxic NLPs.
- Structural determinants for functional diversification of NLPs are highlighted.
- Mutations can switch between non-toxic and toxic phenotypes within the same protein scaffold.
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