5GJ9 image
Deposition Date 2016-06-28
Release Date 2017-05-10
Last Version Date 2024-03-20
Entry Detail
PDB ID:
5GJ9
Keywords:
Title:
Crystal structure of Arabidopsis thaliana ACO2 in complex with POA
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.20
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:1-aminocyclopropane-1-carboxylate oxidase 2
Gene (Uniprot):ACO2
Chain IDs:A, B
Chain Length:303
Number of Molecules:2
Biological Source:Arabidopsis thaliana
Primary Citation
Pyrazinamide and derivatives block ethylene biosynthesis by inhibiting ACC oxidase.
Nat Commun 8 15758 15758 (2017)
PMID: 28604689 DOI: 10.1038/ncomms15758

Abstact

Ethylene is an important phytohormone that promotes the ripening of fruits and senescence of flowers thereby reducing their shelf lives. Specific ethylene biosynthesis inhibitors would help to decrease postharvest loss. Here, we identify pyrazinamide (PZA), a clinical drug used to treat tuberculosis, as an inhibitor of ethylene biosynthesis in Arabidopsis thaliana, using a chemical genetics approach. PZA is converted to pyrazinecarboxylic acid (POA) in plant cells, suppressing the activity of 1-aminocyclopropane-1-carboxylic acid oxidase (ACO), the enzyme catalysing the final step of ethylene formation. The crystal structures of Arabidopsis ACO2 in complex with POA or 2-Picolinic Acid (2-PA), a POA-related compound, reveal that POA/2-PA bind at the active site of ACO, preventing the enzyme from interacting with its natural substrates. Our work suggests that PZA and its derivatives may be promising regulators of plant metabolism, in particular ethylene biosynthesis.

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