7CKD image
Deposition Date 2020-07-16
Release Date 2021-05-26
Last Version Date 2024-10-30
Entry Detail
PDB ID:
7CKD
Keywords:
Title:
Solution structure of NCR169 oxidized form 1 from Medicago truncatula
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
target function
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Nodule Cysteine-Rich (NCR) secreted peptide
Gene (Uniprot):MTR_7g029760
Chain IDs:A
Chain Length:39
Number of Molecules:1
Biological Source:Medicago truncatula
Ligand Molecules
Primary Citation
Structure and antimicrobial activity of NCR169, a nodule-specific cysteine-rich peptide of Medicago truncatula.
Sci Rep 11 9923 9923 (2021)
PMID: 33972675 DOI: 10.1038/s41598-021-89485-w

Abstact

A model legume, Medicago truncatula, has over 600 nodule-specific cysteine-rich (NCR) peptides required for symbiosis with rhizobia. Among them, NCR169, an essential factor for establishing symbiosis, has four cysteine residues that are indispensable for its function. However, knowledge of NCR169 structure and mechanism of action is still lacking. In this study, we solved two NMR structures of NCR169 caused by different disulfide linkage patterns. We show that both structures have a consensus C-terminal β-sheet attached to an extended N-terminal region with dissimilar features; one moves widely, whereas the other is relatively stapled. We further revealed that the disulfide bonds of NCR169 contribute to its structural stability and solubility. Regarding the function, one of the NCR169 oxidized forms could bind to negatively charged bacterial phospholipids. Furthermore, the positively charged lysine-rich region of NCR169 may be responsible for its antimicrobial activity against Escherichia coli and Sinorhizobium meliloti. This active region was disordered even in the phospholipid bound state, suggesting that the disordered conformation of this region is key to its function. Morphological observations suggested the mechanism of action of NCR169 on bacteria. The present study on NCR169 provides new insights into the structure and function of NCR peptides.

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