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Crystal structure of H. pylori isoleucyl-tRNA synthetase (HpIleRS) in apo formCrystal structure of H. pylori isoleucyl-tRNA synthetase (HpIleRS) in apo form
Structural highlights
FunctionSYI_HELPY Catalyzes the attachment of isoleucine to tRNA(Ile). As IleRS can inadvertently accommodate and process structurally similar amino acids such as valine, to avoid such errors it has two additional distinct tRNA(Ile)-dependent editing activities. One activity is designated as 'pretransfer' editing and involves the hydrolysis of activated Val-AMP. The other activity is designated 'posttransfer' editing and involves deacylation of mischarged Val-tRNA(Ile). Publication Abstract from PubMedHelicobacter pylori infection is a global health concern, affecting over half of the world's population. Acquiring structural information on pharmacological targets is crucial to facilitate inhibitor design. Here, we have determined the crystal structures of H. pylori isoleucyl-tRNA synthetase (HpIleRS) in apo form as well as in complex with various substrates (Ile, Ile-AMP, Val, and Val-AMP) or an inhibitor (mupirocin). Our results provide valuable insights into substrate specificity, recognition, and the mechanism by which HpIleRS is inhibited by an antibiotic. Moreover, we identified Asp641 as a prospective regulatory site and conducted biochemical analyses to investigate its regulatory mechanism. The detailed structural information acquired from this research holds promise for the development of highly selective and effective inhibitors against H. pylori infection. Structural basis for substrate and antibiotic recognition by Helicobacter pylori isoleucyl-tRNA synthetase.,Chen X, Guo Y, Shi J, Wang Y, Guo X, Wu G, Li S, Zhang T FEBS Lett. 2024 Mar;598(5):521-536. doi: 10.1002/1873-3468.14805. Epub 2024 Jan , 21. PMID:38246751[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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