6hn9

Nicomicin-1 -- Novel antimicrobial peptides from the Arctic polychaeta Nicomache minor provide new molecular insight into biological role of the BRICHOS domain

spinqualitylabelsall models 6hn9 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6hn9 is a 1 chain structure with sequence from Nicomache minor. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 20 models Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A3G2WH77_9ANNE Publication Abstract from PubMed Endogenous antimicrobial peptides (AMPs) are among the earliest molecular factors in the evolution of animal innate immunity. In this study, novel AMPs named nicomicins were identified in the small marine polychaeta Nicomache minor in the Maldanidae family. Full-length mRNA sequences encoded 239-residue prepropeptides consisting of a putative signal sequence region, the BRICHOS domain within an acidic proregion, and 33-residue mature cationic peptides. Nicomicin-1 was expressed in the bacterial system, and its spatial structure was analyzed by circular dichroism and nuclear magnetic resonance spectroscopy. Nicomicins are unique among polychaeta AMPs scaffolds, combining an amphipathic N-terminal alpha-helix and C-terminal extended part with a six-residue loop stabilized by a disulfide bridge. This structural arrangement resembles the Rana-box motif observed in the alpha-helical host-defense peptides isolated from frog skin. Nicomicin-1 exhibited strong in vitro antimicrobial activity against Gram-positive bacteria at submicromolar concentrations. The main mechanism of nicomicin-1 action is based on membrane damage but not on the inhibition of bacterial translation. The peptide possessed cytotoxicity against cancer and normal adherent cells as well as toward human erythrocytes. Novel Antimicrobial Peptides from the Arctic Polychaeta Nicomache minor Provide New Molecular Insight into Biological Role of the BRICHOS Domain.,Panteleev PV, Tsarev AV, Bolosov IA, Paramonov AS, Marggraf MB, Sychev SV, Shenkarev ZO, Ovchinnikova TV Mar Drugs. 2018 Oct 23;16(11). pii: md16110401. doi: 10.3390/md16110401. PMID:30360541 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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