2QMW: The Crystal Structure Of The Prephenate Dehydratase (Pdt) From Staphylococcus Aureus Subsp. Aureus Mu50

Citation:
Abstract
The enzyme prephenate dehydratase (PDT) converts prephenate to phenylpyruvate in L-phenylalanine biosynthesis. PDT is allosterically regulated by L-Phe and other amino acids. We report the first crystal structures of PDT from Staphylococcus aureus in a relaxed (R) state and PDT from Chlorobium tepidum in a tense (T) state. The two enzymes show low sequence identity (27.3%) but the same prototypic architecture and domain organization. Both enzymes are tetramers (dimer of dimers) in crystal and solution while a PDT dimer can be regarded as a basic catalytic unit. The N-terminal PDT domain consists of two similar subdomains with a cleft in between, which hosts the highly conserved active site. In one PDT dimer two clefts are aligned to form an extended active site across the dimer interface. Similarly at the interface two ACT regulatory domains create two highly conserved pockets. Upon binding of the L-Phe inside the pockets, PDT transits from an open to a closed conformation.
PDB ID: 2QMWDownload
MMDB ID: 54202
PDB Deposition Date: 2007/7/17
Updated in MMDB: 2012/12
Experimental Method:
x-ray diffraction
Resolution: 2.3  Å
Source Organism:
Similar Structures:
Biological Unit for 2QMW: tetrameric; determined by author and by software (PISA)
Molecular Components in 2QMW
Label Count Molecule
Proteins (4 molecules)
4
Prephenate Dehydratase
Molecule annotation
Chemicals (10 molecules)
1
2
2
2
3
4
4
2
* Click molecule labels to explore molecular sequence information.

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