6loo | pdb_00006loo

Crystal Structure of Class IB terpene synthase bound with geranylcitronellyl diphosphate

spinqualitylabelsall models 6loo, resolution 1.99Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6loo is a 2 chain structure with sequence from Alkalihalobacillus alcalophilus ATCC 27647 = CGMCC 1.3604. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.99Å Ligands: ELR, ELU Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A094YZ24_ALKAL Publication Abstract from PubMed Terpene synthases (TS) are classified into two broad types, Class I and II, based on the chemical strategy for initial carbocation formation and motif sequences of the catalytic site. We have recently identified a new class of enzymes, Class IB, showing the acceptability of long (C20-C35) prenyl-diphosphates as substrates and no amino acid sequence homology with known TS. Conversion of long prenyl-diphosphates such as heptaprenyl-diphosphate (C35) is unusual and has never been reported for Class I and II enzymes. Therefore, the characterization of Class IB enzymes is crucial to understand the reaction mechanism of the extensive terpene synthesis. Here, we report the crystal structure bound with a substrate surrogate and biochemical analysis of a Class IB TS, using the enzyme from Bacillus alcalophilus (BalTS). The structure analysis revealed that the diphosphate part of the substrate is located around the two characteristic Asp-rich motifs, and the hydrophobic tail is accommodated in a unique hydrophobic long tunnel, where the C35 prenyl-diphosphate, the longest substrate of BalTS, can be accepted. Biochemical analyses of BalTS showed that the enzymatic property, such as Mg(2+) dependency, is similar to those of Class I enzymes. In addition, a new cyclic terpene was identified from BalTS reaction products. Mutational analysis revealed that five of the six Asp residues in the Asp-rich motifs and two His residues are essential for the formation of the cyclic skeleton. These results provided a clue to consider the application of the unusual large terpene synthesis by Class IB enzymes. Characterization of Class IB Terpene Synthase: The First Crystal Structure Bound with a Substrate Surrogate.,Stepanova R, Inagi H, Sugawara K, Asada K, Nishi T, Ueda D, Yasuno Y, Shinada T, Miki K, Fujihashi M, Sato T ACS Chem Biol. 2020 Jun 19;15(6):1517-1525. doi: 10.1021/acschembio.0c00145. Epub, 2020 Apr 13. PMID:32227910 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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