ジャーナル: Nat Commun / 年: 2024 タイトル: Mechanistic insights into lanthipeptide modification by a distinct subclass of LanKC enzyme that forms dimers. 著者: Yifan Li / Kai Shao / Zhaoxing Li / Kongfu Zhu / Bee Koon Gan / Jian Shi / Yibei Xiao / Min Luo / 要旨: Naturally occurring lanthipeptides, peptides post-translationally modified by various enzymes, hold significant promise as antibiotics. Despite extensive biochemical and structural studies, the ...Naturally occurring lanthipeptides, peptides post-translationally modified by various enzymes, hold significant promise as antibiotics. Despite extensive biochemical and structural studies, the events preceding peptide modification remain poorly understood. Here, we identify a distinct subclass of lanthionine synthetase KC (LanKC) enzymes with distinct structural and functional characteristics. We show that PneKC, a member of this subclass, forms a dimer and possesses GTPase activity. Through three cryo-EM structures of PneKC, we illustrate different stages of peptide PneA binding, from initial recognition to full binding. Our structures show the kinase domain complexed with the PneA core peptide and GTPγS, a phosphate-bound lyase domain, and an unconventional cyclase domain. The leader peptide of PneA interact with a gate loop, transitioning from an extended to a helical conformation. We identify a dimerization hot spot and propose a "negative cooperativity" mechanism toggling the enzyme between tense and relaxed conformation. Additionally, we identify an important salt bridge in the cyclase domain, differing from those in in conventional cyclase domains. These residues are highly conserved in the LanKC subclass and are part of two signature motifs. These results unveil potential differences in lanthipeptide modification enzymes assembly and deepen our understanding of allostery in these multifunctional enzymes.
履歴
登録
2023年9月22日
登録サイト: PDBJ / 処理サイト: PDBJ
改定 1.0
2024年8月28日
Provider: repository / タイプ: Initial release
改定 1.0
2024年8月28日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2024年8月28日
Data content type: FSC / Data content type: FSC / Provider: repository / タイプ: Initial release
改定 1.0
2024年8月28日
Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / タイプ: Initial release
改定 1.0
2024年8月28日
Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / タイプ: Initial release
改定 1.0
2024年8月28日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2024年8月28日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name
名称: Dimeric structure of Class III lanthipeptide modification PneKC with GSP and PneA bound to one protomer. タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT