Preorganized cyclic modules facilitate the self-assembly of protein nanostructures

Snoj J, Lapenta F, Jerala R, Chemical Science (2024) DOI

SASDUQ2 – DiTET-nn (coiled coil protein origami assembled from two linear chains)

RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments)
RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments)
MWexperimental 52 kDa
MWexpected 51 kDa
VPorod 161 nm3
log I(s) 3.74×103 3.74×102 3.74×101 3.74×100
RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) small angle scattering data  s, nm-1
ln I(s)
RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) Guinier plot ln 3.74×103 Rg: 4.3 nm 0 (4.3 nm)-2 s2
(sRg)2I(s)/I(0)
RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) Kratky plot 1.104 0 3 sRg
p(r)
RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) pair distance distribution function Rg: 4.4 nm 0 Dmax: 14.7 nm

Data validation


Fits and models


log I(s)
 s, nm-1
RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) SREFLEX model

Synchrotron SAXS data from solutions of DiTET-nn in 20 mM Tris, 150 mM NaCL, 3% glycerol, 1mM TCEP, pH 7.5 were collected on the EMBL P12 beam line at PETRA III (DESY; Hamburg, Germany) using a Pilatus 6M detector at a sample-detector distance of 3 m and at a wavelength of λ = 0.124 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). In-line size-exclusion chromatography (SEC) SAS was employed. The SEC parameters were as follows: A 80.00 μl sample at 16.4 mg/ml was injected at a 0.75 ml/min flow rate onto a Cytiva Superdex 200 10/300 column at 20°C. 2400 successive 0.995 second frames were collected through the entire SEC elution. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

The experimental molecular weight quoted in this entry was evaluated using SEC-MALS combined with the refractive index (RI) measured before the SAXS measurements.

RH1 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) (RH1)
Mol. type   Protein
Organism   synthetic construct
Olig. state   Monomer
Mon. MW   25.7 kDa
Sequence   FASTA
 
RH2 (Linear coiled-coil protein origami structure consisting of 6 coiled-coil forming segments) (RH2)
Mol. type   Protein
Organism   synthetic construct
Olig. state   Monomer
Mon. MW   25.7 kDa
Sequence   FASTA