6TSO image
Deposition Date 2019-12-20
Release Date 2020-07-29
Last Version Date 2024-01-24
Entry Detail
PDB ID:
6TSO
Title:
Marasmius oreades agglutinin (MOA) inhibited by cadmium
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.22
R-Value Work:
0.19
Space Group:
P 63 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Agglutinin
Chain IDs:A (auth: AAA)
Chain Length:293
Number of Molecules:1
Biological Source:Marasmius oreades
Primary Citation
Crystal structure of MOA in complex with a peptide fragment: A protease caught in flagranti .
Curr Res Struct Biol 2 56 67 (2020)
PMID: 34235469 DOI: 10.1016/j.crstbi.2020.04.003

Abstact

The Marasmius oreades agglutinin (MOA) is the holotype of an emerging family of fungal chimerolectins and an active Ca2+/Mn2+-dependent protease, which exhibits a unique papain-like fold with special active site features. Here we investigated the functional significance of the structural elements differentiating MOA from other papain-like cysteine proteases. X-ray crystal structures of MOA co-crystallized with two synthetic substrates reveal cleaved peptides bound to the catalytic site, corresponding to the final products of the proteolytic reaction. Anomalous diffraction data on crystals grown in the presence of calcium and manganese, cadmium or zinc resolve the calcium/manganese preference of MOA and elucidate the inhibitory roles of zinc and cadmium towards papain-like cysteine proteases in general. The reported structures, together with activity data of MOA active site variants, point to a conservation of the general proteolysis mechanism established for papain. Ultimately, the findings suggest that papain and the papain-like domain of MOA are the product of convergent evolution.

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Primary Citation of related structures