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Updated: Jun 24, 2026

Peptide-based Identification of Functional Motifs and their Binding Partners
Published on: June 30, 2013
The structural basis for peptide selection by the transport receptor OppA
Ronnie P-A Berntsson1, Mark K Doeven, Fabrizia Fusetti
1Biochemistry Department, Groningen Biomolecular Sciences and Biotechnology Institute & Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
Lactococcus lactis OppA protein binds peptides of diverse lengths and compositions. Structural analysis reveals a large cavity and flexible termini enabling this broad binding, with a preference for proline-rich peptides.
Area of Science:
- Structural Biology
- Microbiology
- Biochemistry
Background:
- Oligopeptide-binding protein A (OppA) from Lactococcus lactis exhibits broad peptide-binding capabilities.
- Understanding OppA's mechanism is crucial for deciphering nutrient uptake in L. lactis.
Purpose of the Study:
- To elucidate the structural basis for OppA's promiscuous peptide binding.
- To investigate the role of peptide composition versus sequence in OppA selection.
Main Methods:
- Determination of crystal structures of OppA in open and closed conformations.
- Analysis of structural features correlating with peptide binding promiscuity.
Main Results:
- Revealed a large internal cavity and flexible N/C termini accommodating peptides of 4-35 residues.
- Identified peptide amino acid composition, specifically proline-richness and isoleucine presence, as a key selection factor, not sequence.
- Linked OppA's binding preference to L. lactis's physiological needs for branched-chain amino acids and casein utilization.
Conclusions:
- OppA's structural plasticity explains its wide-ranging peptide length and sequence tolerance.
- A novel peptide selection mechanism based on amino acid composition, rather than sequence, is proposed for OppA.
- This mechanism supports L. lactis's nutritional strategy, utilizing proline-rich peptides.
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