4I3U: Structure Of Phosphonoacetaldehyde Dehydrogenase In Complex With Phosphonoacetaldehyde

Citation:
Abstract
Phosphonates (C-PO3(2-)) have applications as antibiotics, herbicides, and detergents. In some environments, these molecules represent the predominant source of phosphorus, and several microbes have evolved dedicated enzymatic machineries for phosphonate degradation. For example, most common naturally occurring phosphonates can be catabolized to either phosphonoacetaldehyde or phosphonoacetate, which can then be hydrolyzed to generate inorganic phosphate and acetaldehyde or acetate, respectively. The phosphonoacetaldehyde oxidase gene (phnY) links these two hydrolytic processes and provides a previously unknown catabolic mechanism for phosphonoacetate production in the microbial metabolome. Here, we present biochemical characterization of PhnY and high-resolution crystal structures of the apo state, as well as complexes with substrate, cofactor, and product. Kinetic analysis of active site mutants demonstrates how a highly conserved aldehyde dehydrogenase active site has been modified in nature to generate activity with a phosphonate substrate.
PDB ID: 4I3UDownload
MMDB ID: 115437
PDB Deposition Date: 2012/11/26
Updated in MMDB: 2013/11
Experimental Method:
x-ray diffraction
Resolution: 2.1  Å
Source Organism:
Similar Structures:
Biological Unit for 4I3U: dimeric; determined by author and by software (PISA)
Molecular Components in 4I3U
Label Count Molecule
Proteins (2 molecules)
2
Aldehyde Dehydrogenase (Nad+)
Molecule annotation
Chemicals (2 molecules)
1
2
* Click molecule labels to explore molecular sequence information.

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