4q84 | pdb_00004q84

Apo YcaO

spinqualitylabelsall models 4q84, resolution 2.64Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4q84 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HG Related: 4q85, 4q86 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Despite intensive research, the cyclodehydratase responsible for azoline biogenesis in thiazole/oxazole-modified microcin (TOMM) natural products remains enigmatic. The collaboration of two proteins, C and D, is required for cyclodehydration. The C protein is homologous to E1 ubiquitin-activating enzymes, whereas the D protein is within the YcaO superfamily. Recent studies have demonstrated that TOMM YcaOs phosphorylate amide carbonyl oxygens to facilitate azoline formation. Here we report the X-ray crystal structure of an uncharacterized YcaO from Escherichia coli (Ec-YcaO). Ec-YcaO harbors an unprecedented fold and ATP-binding motif. This motif is conserved among TOMM YcaOs and is required for cyclodehydration. Furthermore, we demonstrate that the C protein regulates substrate binding and catalysis and that the proline-rich C terminus of the D protein is involved in C protein recognition and catalysis. This study identifies the YcaO active site and paves the way for the characterization of the numerous YcaO domains not associated with TOMM biosynthesis. Discovery of a new ATP-binding motif involved in peptidic azoline biosynthesis.,Dunbar KL, Chekan JR, Cox CL, Burkhart BJ, Nair SK, Mitchell DA Nat Chem Biol. 2014 Aug 17. doi: 10.1038/nchembio.1608. PMID:25129028 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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