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-Structure paper
| タイトル | Structural insights into the substrate binding mechanism of the class I dehydratase MadB. |
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| ジャーナル・号・ページ | Commun Biol, Vol. 8, Issue 1, Page 1032, Year 2025 |
| 掲載日 | 2025年7月9日 |
著者 | C Vivien Knospe / Julio Ortiz / Jens Reiners / Alexej Kedrov / Christoph G W Gertzen / Sander H J Smits / Lutz Schmitt / ![]() |
| PubMed 要旨 | In the battle against antimicrobial resistance, lantibiotics have emerged as promising new sources for antimicrobial drugs. Their exceptional stability is due to characteristic modifications termed ...In the battle against antimicrobial resistance, lantibiotics have emerged as promising new sources for antimicrobial drugs. Their exceptional stability is due to characteristic modifications termed (methyl-)lanthionine rings. Genome mining efforts have identified hundreds of lantibiotics by detecting gene operons, so-called biosynthetic gene clusters (BGC), which encode cysteine-rich peptides (30-50 amino acids in size) and enzymes responsible for dehydration and cyclization, catalyzing the post-translational ring formation. One such identified, class I lantibiotic is maddinglicin from Clostridium maddingley. Here, we present single particle cryo-EM structures of the dehydratase MadB in both, its apo-state and in complex with a leader peptide of maddinglicin, revealing a distinct conformational change upon substrate binding. Small-angle X-ray scattering studies elucidate the substrate binding site for the C-terminal part of maddinglicin. Furthermore, a substrate specificity analysis was performed highlighting a critical stretch of amino acids within the maddinglicin leader sequence that is crucial for binding. Here, we provide molecular insights into the conformational changes, principles of substrate recognition and ligand:protein stoichiometry of a class I lantibiotic dehydratase. |
リンク | Commun Biol / PubMed:40634635 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.7 - 3.13 Å |
| 構造データ | EMDB-50910, PDB-9g04: EMDB-50911, PDB-9g05: |
| 由来 |
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キーワード | BIOSYNTHETIC PROTEIN / lanthipeptides / dehydratases / cryo-EM structure / class I lantibiotic |
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Clostridium maddingley (バクテリア)
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