2qmx

The crystal structure of L-Phe inhibited prephenate dehydratase from Chlorobium tepidum TLS

spinqualitylabelsall models 2qmx, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2qmx is a 2 chain structure with sequence from Chlorobium tepidum tls. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, EDO, PHE NonStd Res: MSE Gene: pheA, CT1666 (Chlorobium tepidum TLS) Activity: Prephenate dehydratase, with EC number 4.2.1.51 Resources: FirstGlance, OCA, RCSB, PDBsum, TOPSAN Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed 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. Structures of open (R) and close (T) states of prephenate dehydratase (PDT)--implication of allosteric regulation by L-phenylalanine.,Tan K, Li H, Zhang R, Gu M, Clancy ST, Joachimiak A J Struct Biol. 2008 Apr;162(1):94-107. Epub 2007 Nov 29. PMID:18171624 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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