9bt3
Crystal structure of Chorismate Mutase from Mycobacterium tuberculosis in complex with the cyclic peptide inhibitor L2.1 (triclinic form)
Structural highlights
FunctionSCMU_MYCTU Catalyzes the Claisen rearrangement of chorismate to prephenate. May play some role in the pathogenicity.[1] [2] Publication Abstract from PubMedThe secreted Chorismate mutase enzyme of Mycobacterium tuberculosis (*MtbCM) is an underexplored potential target for the development of new antitubercular agents that are increasingly needed as antibiotic resistance rises in prevalence. As an enzyme suspected to be involved in virulence and host-pathogen interactions, disruption of its function could circumvent the difficulty of treating tuberculosis-infected granulomas. Drug development, however, is limited by novel ligand discovery. Currently, *MtbCM activity is measured by using a low throughput acid/base-mediated product derivatization absorbance assay. Here, we utilized an RNA-display affinity selection approach enabled by the Random Peptides Integrated Discovery (RaPID) system to screen a vast library of macrocyclic peptides (MCP) for novel *MtbCM ligands. Peptides identified from the RaPID selection, and analogs thereof identified by analyzing the selection population dynamics, produced a new class of *MtbCM inhibiting MCPs. Among these were two noteworthy "chorismides", whose binding modes were elucidated by X-ray crystallography. Both were potent inhibitors of the CM enzyme activity. One was identified as an allosteric binding peptide revealing a novel inhibition approach, while the other is an active-site binding peptide that when conjugated to a fluorescent probe allowed for the development of a series of alternative fluorescence-based ligand-displacement assays that can be utilized for the assessment of potential *MtbCM inhibitors. Active- and Allosteric-Site Cyclic Peptide Inhibitors of Secreted M. tuberculosis Chorismate Mutase.,van Neer RHP, Dranchak PK, Aitha M, Liu L, Carlson EK, Jacobsen IE, Battaile K, Fang Y, Tao D, Rai G, Padia J, Lovell S, Suga H, Inglese J ACS Infect Dis. 2025 Feb 4. doi: 10.1021/acsinfecdis.4c00798. PMID:39903128[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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