7apm | pdb_00007apm

tRNA-guanine transglycosylase H319C mutant spin-labeled with MTSL

spinqualitylabelsall models 7apm, resolution 1.66Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7apm is a 1 chain structure with sequence from Zymmo. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, GOL, ZN NonStd Res: R1A Related: 7apl Gene: tgt, ZMO0363 (ZYMMO) Activity: tRNA-guanine(34) transglycosylase, with EC number 2.4.2.29 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [TGT_ZYMMO] Exchanges the guanine residue with 7-aminomethyl-7-deazaguanine in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr). After this exchange, a cyclopentendiol moiety is attached to the 7-aminomethyl group of 7-deazaguanine, resulting in the hypermodified nucleoside queuosine (Q) (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-yl)amino)methyl)-7-deazaguanosine).[HAMAP-Rule:MF_00168] Publication Abstract from PubMed Mechanistic insights into protein-ligand interactions can yield chemical tools for modulating protein function and enable their use for therapeutic purposes. For the homodimeric enzyme tRNA-guanine transglycosylase (TGT), a putative virulence target of shigellosis, ligand binding has been shown by crystallography to transform the functional dimer geometry into an incompetent twisted one. However, crystallographic observation of both end states does neither verify the ligand-induced transformation of one dimer into the other in solution nor does it shed light on the underlying transformation mechanism. We addressed these questions in an approach that combines site-directed spin labeling (SDSL) with distance measurements based on pulsed electron-electron double resonance (PELDOR or DEER) spectroscopy. We observed an equilibrium between the functional and twisted dimer that depends on the type of ligand, with a pyranose-substituted ligand being the most potent one in shifting the equilibrium toward the twisted dimer. Our experiments suggest a dissociation-association mechanism for the formation of the twisted dimer upon ligand binding. Unraveling a Ligand-Induced Twist of a Homodimeric Enzyme by Pulsed Electron-Electron Double Resonance.,Nguyen D, Abdullin D, Heubach CA, Pfaffeneder T, Nguyen A, Heine A, Reuter K, Diederich F, Schiemann O, Klebe G Angew Chem Int Ed Engl. 2021 Aug 12. doi: 10.1002/anie.202108179. PMID:34387025 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also TRNA-guanine transglycosylase

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