8R8C image
Entry Detail
PDB ID:
8R8C
Title:
Structure of the N-terminal domain of CMA from Cucumis melo in complex with N-acetylgalactosamine
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-11-28
Release Date:
2023-12-27
Method Details:
Experimental Method:
Resolution:
1.55 Å
R-Value Free:
0.20
R-Value Work:
0.16
Space Group:
I 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Nigrin b-like
Chain IDs:A
Chain Length:130
Number of Molecules:1
Biological Source:Cucumis melo
Primary Citation
Elucidating the glycan-binding specificity and structure of Cucumis melo agglutinin, a new R-type lectin.
Beilstein J Org Chem 20 306 320 (2024)
PMID: 38410776 DOI: 10.3762/bjoc.20.31

Abstact

Plant lectins have garnered attention for their roles as laboratory probes and potential therapeutics. Here, we report the discovery and characterization of Cucumis melo agglutinin (CMA1), a new R-type lectin from melon. Our findings reveal CMA1's unique glycan-binding profile, mechanistically explained by its 3D structure, augmenting our understanding of R-type lectins. We expressed CMA1 recombinantly and assessed its binding specificity using multiple glycan arrays, covering 1,046 unique sequences. This resulted in a complex binding profile, strongly preferring C2-substituted, beta-linked galactose (both GalNAc and Fuca1-2Gal), which we contrasted with the established R-type lectin Ricinus communis agglutinin 1 (RCA1). We also report binding of specific glycosaminoglycan subtypes and a general enhancement of binding by sulfation. Further validation using agglutination, thermal shift assays, and surface plasmon resonance confirmed and quantified this binding specificity in solution. Finally, we solved the high-resolution structure of the CMA1 N-terminal domain using X-ray crystallography, supporting our functional findings at the molecular level. Our study provides a comprehensive understanding of CMA1, laying the groundwork for further exploration of its biological and therapeutic potential.

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