7ag8 | pdb_00007ag8

Cryo-EM structure of wild-type KatG from M. tuberculosis

spinqualitylabelsall models 7ag8, resolution 2.68Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7ag8 is a 2 chain structure with sequence from "bacillus_tuberculosis"_(zopf_1883)_klein_1884 "bacillus tuberculosis" (zopf 1883) klein 1884. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEM Gene: katG, AYJ03_010035, ERS007661_00994, ERS013471_02729, ERS024276_01596, ERS075361_01376, ERS094182_01139, F6W99_00474, FRD82_12135 ("Bacillus tuberculosis" (Zopf 1883) Klein 1884) Activity: Catalase peroxidase, with EC number 1.11.1.21 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [A0A0D5ZBI4_MYCTX] Bifunctional enzyme with both catalase and broad-spectrum peroxidase activity.[HAMAP-Rule:MF_01961] Publication Abstract from PubMed Resolution advances in cryoelectron microscopy (cryo-EM) now offer the possibility to visualize structural effects of naturally occurring resistance mutations in proteins and also of understanding the binding mechanisms of small drug molecules. In Mycobacterium tuberculosis the multifunctional heme enzyme KatG is indispensable for activation of isoniazid (INH), a first-line pro-drug for treatment of tuberculosis. We present a cryo-EM methodology for structural and functional characterization of KatG and INH resistance variants. The cryo-EM structure of the 161 kDa KatG dimer in the presence of INH is reported to 2.7 A resolution allowing the observation of potential INH binding sites. In addition, cryo-EM structures of two INH resistance variants, identified from clinical isolates, W107R and T275P, are reported. In combination with electronic absorbance spectroscopy our cryo-EM approach reveals how these resistance variants cause disorder in the heme environment preventing heme uptake and retention, providing insight into INH resistance. Using cryo-EM to understand antimycobacterial resistance in the catalase-peroxidase (KatG) from Mycobacterium tuberculosis.,Munir A, Wilson MT, Hardwick SW, Chirgadze DY, Worrall JAR, Blundell TL, Chaplin AK Structure. 2021 Jan 4. pii: S0969-2126(20)30475-5. doi:, 10.1016/j.str.2020.12.008. PMID:33444527 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Catalase 3D structures

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