7LQI image
Entry Detail
PDB ID:
7LQI
EMDB ID:
Keywords:
Title:
Cryo-EM of KFE8 thicker nanotube
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2021-02-13
Release Date:
2021-06-30
Method Details:
Experimental Method:
Resolution:
3.50 Å
Aggregation State:
FILAMENT
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:KFE8 peptide
Chain IDs:A, B (auth: K), C (auth: L), D (auth: M), E (auth: N), F (auth: B), G (auth: R), H (auth: S), I (auth: T), J (auth: U), K (auth: C), L (auth: Y), M (auth: Z), N (auth: f), O (auth: g), P (auth: D), Q (auth: k), R (auth: l), S (auth: m), T (auth: n), U (auth: E), V (auth: r), W (auth: s), X (auth: t), Y (auth: u), Z (auth: F), AA (auth: y), BA (auth: z), CA (auth: 0), DA (auth: 1), EA (auth: G), FA (auth: 5), GA (auth: 6), HA (auth: 7), IA (auth: 8), JA (auth: H), KA (auth: CA), LA (auth: DA), MA (auth: EA), NA (auth: FA), OA (auth: I), PA (auth: JA), QA (auth: KA), RA (auth: LA), SA (auth: MA), TA (auth: J), UA (auth: QA), VA (auth: RA), WA (auth: SA), XA (auth: TA), YA (auth: a), ZA (auth: XA), AB (auth: YA), BB (auth: ZA), CB (auth: aA), DB (auth: bA), EB (auth: cA), FB (auth: dA), GB (auth: eA), HB (auth: fA), IB (auth: b), JB (auth: mA), KB (auth: nA), LB (auth: oA), MB (auth: pA), NB (auth: qA), OB (auth: rA), PB (auth: sA), QB (auth: tA), RB (auth: uA), SB (auth: c), TB (auth: 1A), UB (auth: 2A), VB (auth: 3A), WB (auth: 4A), XB (auth: 5A), YB (auth: 6A), ZB (auth: 7A), AC (auth: 8A), BC (auth: 9A), CC (auth: d), DC (auth: GB), EC (auth: HB), FC (auth: IB), GC (auth: JB), HC (auth: KB), IC (auth: LB), JC (auth: MB), KC (auth: NB), LC (auth: OB), MC (auth: e), NC (auth: VB), OC (auth: WB), PC (auth: XB), QC (auth: YB), RC (auth: ZB), SC (auth: aB), TC (auth: bB), UC (auth: cB), VC (auth: dB)
Chain Length:8
Number of Molecules:100
Biological Source:synthetic construct
Ligand Molecules
Primary Citation
Deterministic chaos in the self-assembly of beta sheet nanotubes from an amphipathic oligopeptide.
Matter 4 3217 3231 (2021)
PMID: 34632372 DOI: 10.1016/j.matt.2021.06.037

Abstact

The self-assembly of designed peptides into filaments and other higher-order structures has been the focus of intense interest because of the potential for creating new biomaterials and biomedical devices. These peptide assemblies have also been used as models for understanding biological processes, such as the pathological formation of amyloid. We investigate the assembly of an octapeptide sequence, Ac-FKFEFKFE-NH2, motivated by prior studies that demonstrated that this amphipathic β strand peptide self-assembled into fibrils and biocompatible hydrogels. Using high-resolution cryoelectron microscopy (cryo-EM), we are able to determine the atomic structure for two different coexisting forms of the fibrils, containing four and five β sandwich protofilaments, respectively. Surprisingly, the inner walls in both forms are parallel β sheets, while the outer walls are antiparallel β sheets. Our results demonstrate the chaotic nature of peptide self-assembly and illustrate the importance of cryo-EM structural analysis to understand the complex phase behavior of these materials at near-atomic resolution.

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Primary Citation of related structures