7oae
From Proteopedia
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==Cryo-EM structure of the plectasin fibril (double strands)== | ==Cryo-EM structure of the plectasin fibril (double strands)== | ||
| - | <StructureSection load='7oae' size='340' side='right'caption='[[7oae]]' scene=''> | + | <StructureSection load='7oae' size='340' side='right'caption='[[7oae]], [[Resolution|resolution]] 2.00Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7OAE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OAE FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[7oae]] is a 42 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudoplectania_nigrella Pseudoplectania nigrella]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7OAE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OAE FirstGlance]. <br> |
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7oae FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7oae OCA], [https://pdbe.org/7oae PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7oae RCSB], [https://www.ebi.ac.uk/pdbsum/7oae PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7oae ProSAT]</span></td></tr> | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7oae FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7oae OCA], [https://pdbe.org/7oae PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7oae RCSB], [https://www.ebi.ac.uk/pdbsum/7oae PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7oae ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/DEFPL_PSENR DEFPL_PSENR] Antimicrobial peptide that potently acts against several species of Gram-positive bacteria (PubMed:16222292, PubMed:19472324). It selectively inhibits peptidoglycan biosynthesis through complex formation with the cell wall precursor lipid II (1:1 molar ratio) thus inhibiting cell wall synthesis (PubMed:20508130). It does not disrupt cell membranes (PubMed:20508130). Is especially active against numerous clinical isolates of S.pneumoniae, including all 90 different serotypes and isolates resistant to clinically used antibiotics (PubMed:16222292). In vitro, shows considerable selectivity for bacteria over mammalian cells (PubMed:16222292). The peptide synthesized in D-amino acids does not show antibacterial activity (PubMed:19472324). In vitro, acts on voltage-gated potassium channels by moderately inhibiting mammalian Kv1.3/KCNA3 (IC(50)=2.8 uM), and moderately inhibiting others potassium channels (PubMed:25568977).<ref>PMID:16222292</ref> <ref>PMID:25568977</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Self-assembly and fibril formation play important roles in protein behaviour. Amyloid fibril formation is well-studied due to its role in neurodegenerative diseases and characterized by refolding of the protein into predominantly beta-sheet form. However, much less is known about the assembly of proteins into other types of supramolecular structures. Using cryo-electron microscopy at a resolution of 1.97 A, we show that a triple-mutant of the anti-microbial peptide plectasin, PPI42, assembles into helical non-amyloid fibrils. The in vitro anti-microbial activity was determined and shown to be enhanced compared to the wildtype. Plectasin contains a cysteine-stabilised alpha-helix-beta-sheet structure, which remains intact upon fibril formation. Two protofilaments form a right-handed protein fibril. The fibril formation is reversible and follows sigmoidal kinetics with a pH- and concentration dependent equilibrium between soluble monomer and protein fibril. This high-resolution structure reveals that alpha/beta proteins can natively assemble into fibrils. | ||
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| + | pH- and concentration-dependent supramolecular assembly of a fungal defensin plectasin variant into helical non-amyloid fibrils.,Pohl C, Effantin G, Kandiah E, Meier S, Zeng G, Streicher W, Segura DR, Mygind PH, Sandvang D, Nielsen LA, Peters GHJ, Schoehn G, Mueller-Dieckmann C, Noergaard A, Harris P Nat Commun. 2022 Jun 7;13(1):3162. doi: 10.1038/s41467-022-30462-w. PMID:35672293<ref>PMID:35672293</ref> | ||
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| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 7oae" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
| + | [[Category: Pseudoplectania nigrella]] | ||
[[Category: Effantin G]] | [[Category: Effantin G]] | ||
Revision as of 20:22, 16 November 2022
Cryo-EM structure of the plectasin fibril (double strands)
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