{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T23:02:12Z","timestamp":1770073332219,"version":"3.49.0"},"reference-count":61,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2025,9,30]],"date-time":"2025-09-30T00:00:00Z","timestamp":1759190400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Education","award":["RG 113\/23"],"award-info":[{"award-number":["RG 113\/23"]}]}],"content-domain":{"domain":["www.mdpi.com"],"crossmark-restriction":true},"short-container-title":["IJMS"],"abstract":"<jats:p>Antimicrobial peptides (AMPs), also referred to as host defense peptides, are promising molecules in the development of the next generation of antibiotics against drug-resistant bacterial pathogens. Thanatin comprises a family of naturally occurring cationic AMPs derived from several species of insects. The first thanatin, 21 residues long, was identified from the spined soldier bug, and more thanatin peptides have been discovered in recent studies. The 16-residue thanatin from Anasa tristis, or Ana-thanatin, represents the shortest sequence in the family. However, the antimicrobial activity and mechanistic process underpinning bacterial cell killing have yet to be reported for Ana-thanatin peptide. In this work, we examined the antibacterial activity, structures, and target interactions of Ana-thanatin. Our results demonstrated that Ana-thanatin exerts potent antibiotic activity against strains of Gram-negative and Gram-positive bacteria. Biophysical studies demonstrated that Ana-thanatin interacts with LPS outer membrane and can permeabilize the OM barrier in the process. Atomic-resolution structures of the peptide in free solution and in complex with lipopolysaccharide (LPS) micelle were solved by NMR, determining canonical \u03b2-sheet structures. Notably, in complex with LPS, the \u03b2-sheet structure of the peptide was better defined in terms of the packing of amino acid residues. Further, MD simulations demonstrated rapid binding of the Ana-thanatin peptide with the LPS molecules within the lipid bilayers. These studies have revealed structural features which could be responsible for LPS-OM disruption of the Gram-negative bacteria. In addition, NMR heteronuclear single quantum coherence (HSQC) studies have demonstrated that Ana-thanatin can strongly interact with the LPS transport periplasmic protein LptAm, potentially inhibiting OM biogenesis. Taken together, we surmise that the Ana-thanatin peptide could serve as a template for the further development of novel antibiotics.<\/jats:p>","DOI":"10.3390\/ijms26199571","type":"journal-article","created":{"date-parts":[[2025,9,30]],"date-time":"2025-09-30T15:38:55Z","timestamp":1759246735000},"page":"9571","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Structures, Interactions, and Antimicrobial Activity of the Shortest Thanatin Peptide from Anasa tristis"],"prefix":"10.3390","volume":"26","author":[{"given":"Swaleeha Jaan","family":"Abdullah","sequence":"first","affiliation":[{"name":"School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-6489-9027","authenticated-orcid":false,"given":"Jia Sheng","family":"Guan","sequence":"additional","affiliation":[{"name":"School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2499-026X","authenticated-orcid":false,"given":"Yuguang","family":"Mu","sequence":"additional","affiliation":[{"name":"School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7015-1937","authenticated-orcid":false,"given":"Surajit","family":"Bhattacharjya","sequence":"additional","affiliation":[{"name":"School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100947","DOI":"10.1016\/j.lanmic.2024.07.010","article-title":"Antimicrobial resistance: A concise update","volume":"6","author":"Ho","year":"2025","journal-title":"Lancet Microbe"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"eaau4679","DOI":"10.1126\/science.aau4679","article-title":"The challenge of antimicrobial resistance: What economics can contribute","volume":"364","author":"Roope","year":"2019","journal-title":"Science"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"280","DOI":"10.1038\/s41579-022-00820-y","article-title":"Molecular mechanisms of antibiotic resistance revisited","volume":"21","author":"Darby","year":"2023","journal-title":"Nat. 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