5emh

Crystal structure of Iridoid Synthase from Cantharanthus roseus in complex with NADP+

spinqualitylabelsall models 5emh, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5emh is a 1 chain structure with sequence from Catharanthus roseus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: NAP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function IRIS_CATRO Publication Abstract from PubMed Iridoid synthases belong to the family of short-chain dehydrogenase/reductase involved in the biosynthesis of iridoids. Despite having high sequence and structural homology with progesterone 5beta-reductase, these enzymes exhibit differential substrate specificities. Previously, two loops, L1 and L2 at substrate-binding pocket, were suggested to be involved in generating substrate specificity. However, the structural basis of specificity determinants was elusive. Here, combining sequence and structural analysis, site-directed mutagenesis, and molecular dynamics simulations, we have shown that iridoid synthase contains two channels for substrate entry whose geometries are altered by L1-L2 dynamics, primarily orchestrated by interactions of residues Glu161 and Gly162 of L1 and Asn358 of L2. A complex interplay of these interactions confer the substrate specificity to the enzyme. Dynamics of loops at the substrate entry channel determine the specificity of iridoid synthases.,Sandholu AS, Mohole M, Duax WL, Thulasiram HV, Sengupta D, Kulkarni K FEBS Lett. 2018 Aug;592(15):2624-2635. doi: 10.1002/1873-3468.13174. Epub 2018, Jul 10. PMID:29944733 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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