9KNJ image
Entry Detail
PDB ID:
9KNJ
Title:
Crystal structure of glycerol-bound full-length PHA synthase (PhaC) from Aeromonas caviae
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-11-19
Release Date:
2025-05-21
Method Details:
Experimental Method:
Resolution:
2.70 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:PHA synthase
Chain IDs:A, B, C
Chain Length:596
Number of Molecules:3
Biological Source:Aeromonas caviae
Ligand Molecules
Primary Citation
Structures of Polyhydroxyalkanoate Synthase PhaC from Aeromonas caviae, Producing Biodegradable Plastics.
Angew.Chem.Int.Ed.Engl. ? e202504626 e202504626 (2025)
PMID: 40276819 DOI: 10.1002/anie.202504626

Abstact

Polyhydroxyalkanoate (PHA) is a biodegradable polyester that can serve as a promising alternative to petrochemical plastics, which present a serious source of pollution. PHA synthase (PhaC) is a key enzyme responsible for producing a wide variety of PHAs in microorganisms. Here, we present crystal structures of full-length PhaC from Aeromonas caviae, a high-performance PhaC employed for industrial use. The structure reveals an N-terminal helical domain that mediates head-to-head dimerization and stabilizes the C-terminal α/β catalytic domain to form a tunnel that connects the catalytic center embedded inside the protein to the protein surface. We showed that this tunnel is a putative egress tunnel for the product PHA chain. Our results establish a fundamental understanding of the PhaC machinery that should lead to improvement of this enzyme in industrial applications.

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