Pyrazinamide inhibits trans-translation in Mycobacterium tuberculosis.
Pyrazinamide inhibits trans-translation in Mycobacterium tuberculosis.
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DOI:
10.1126/science.1208813
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发表时间:
2011-09-16
期刊:
影响因子:
--
通讯作者:
Zhang Y
中科院分区:
文献类型:
--
作者:
Shi W;Zhang X;Jiang X;Yuan H;Lee JS;Barry CE 3rd;Wang H;Zhang W;Zhang Y
Pyrazinamide (PZA) is a first-line tuberculosis drug that plays a unique role in shortening the duration of tuberculosis chemotherapy. PZA is hydrolyzed intracellularly to pyrazinoic acid (POA) by pyrazinamidase (PZase), an enzyme frequently lost in PZA-resistant strains, but the downstream target of POA in Mycobacterium tuberculosis (Mtb) has remained elusive. Here we identify a new target of POA as the ribosomal protein S1 (RpsA), a vital protein involved in protein translation and the ribosome-sparing process of trans-translation. Affinity chromatography using immobilized POA selectively retained RpsA and a PZA-resistant clinical isolate without pncA mutation harbored an alanine deletion in its C-terminus. RpsA overexpression conferred increased PZA resistance and we confirmed biochemically that POA bound to RpsA (but not the ΔAla mutant) and inhibited trans-translation rather than canonical translation. Trans-translation is essential for freeing scarce ribosomes in non-replicating organisms and its inhibition may explain the unique ability of PZA to eradicate persisting organisms.
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