8PE2 image
Entry Detail
PDB ID:
8PE2
Keywords:
Title:
Crystal structure of Gel4 in complex with Nanobody 3
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2023-06-13
Release Date:
2024-06-19
Method Details:
Experimental Method:
Resolution:
2.05 Å
R-Value Free:
0.20
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:1,3-beta-glucanosyltransferase
Chain IDs:A
Chain Length:451
Number of Molecules:1
Biological Source:Aspergillus fumigatus
Polymer Type:polypeptide(L)
Description:Nanobody 3
Chain IDs:B
Chain Length:120
Number of Molecules:1
Biological Source:Vicugna pacos
Primary Citation
Broad Protection against Invasive Fungal Disease from a Nanobody Targeting the Active Site of Fungal beta-1,3-Glucanosyltransferases.
Angew.Chem.Int.Ed.Engl. 63 e202405823 e202405823 (2024)
PMID: 38856634 DOI: 10.1002/anie.202405823

Abstact

Invasive fungal disease accounts for about 3.8 million deaths annually, an unacceptable rate that urgently prompts the discovery of new knowledge-driven treatments. We report the use of camelid single-domain nanobodies (Nbs) against fungal β-1,3-glucanosyltransferases (Gel) involved in β-1,3-glucan transglycosylation. Crystal structures of two Nbs with Gel4 from Aspergillus fumigatus revealed binding to a dissimilar CBM43 domain and a highly conserved catalytic domain across fungal species, respectively. Anti-Gel4 active site Nb3 showed significant antifungal efficacy in vitro and in vivo prophylactically and therapeutically against different A. fumigatus and Cryptococcus neoformans isolates, reducing the fungal burden and disease severity, thus significantly improving immunocompromised animal survival. Notably, C. deneoformans (serotype D) strains were more susceptible to Nb3 and genetic Gel deletion than C. neoformans (serotype A) strains, indicating a key role for β-1,3-glucan remodelling in C. deneoformans survival. These findings add new insight about the role of β-1,3-glucan in fungal biology and demonstrate the potential of nanobodies in targeting fungal enzymes to combat invasive fungal diseases.

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