3uww

Crystal structure of Staphylococcus Aureus triosephosphate isomerase complexed with 3-phosphoglyceric acid

spinqualitylabelsall models 3uww, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3uww is a 2 chain structure with sequence from Staphylococcus aureus subsp. aureus MRSA252. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.25Å Ligands: 3PG, DTT, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TPIS_STAAR Publication Abstract from PubMed Staphylococcus aureus is one of the most dreaded pathogens worldwide and emergence of notorious antibiotic resistant strains have further exacerbated the present scenario. The glycolytic enzyme, triosephosphate isomerase (TIM) is one of the cell envelope proteins of the coccus and is involved in biofilm formation. It also plays an instrumental role in adherence and invasion of the bacteria into the host cell. To structurally characterize this important enzyme and analyze it's interaction with different inhibitors, substrate and transition state analogues, the present article describes several crystal structures of SaTIM alone and in complex with different ligands: glycerol-3-phosphate (G3P), glycerol-2-phosphate (G2P), 3-phosphoglyceric acid (3PG) and 2-phosphoglyceric acid (2PG). Unique conformations of the catalytic loop 6 (L6) has been observed in the different complexes. It is found to be in "almost closed" conformation in both subunits of the structure complexed to G3P. However L6 adopts the open conformation in presence of G2P and 2PG. The preference of the conformation of the catalytic loop can be correlated with the position of the phosphate group in the ligand. Novel modes of binding have been observed for G2P and 3PG for the very first time. The triose moiety is oriented away from the catalytic residues and occupies an entirely different position in some subunits. A completely new binding site for phosphate has also been identified in the complex with 2PG which differs substantially from the conventional phosphate binding site of the ligand in the crystal structures of TIM determined so far. Crystal structures of triosephosphate isomerase from methicillin resistant Staphylococcus aureus MRSA252 provide structural insights into novel modes of ligand binding and unique conformations of catalytic loop.,Mukherjee S, Roychowdhury A, Dutta D, Das AK Biochimie. 2012 Jul 17. PMID:22813930 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Triose phosphate isomerase 3D structures

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