Conformational ensembles of flexible multidomain proteins: How close are we to accurate and reliable predictions?

Rodriguez S Fournet A, Bartels S, Pajkos M, Clerc I, Carrière L, Thureau A, Montanier C, Dumon C, Allemand F, Cortés J, Bernadó P, Biophysical Journal (2026) DOI

SASD2U7 – Conformational ensembles of domain–linker–domain (DLD) protein chimera consisting of Glycosyl hydrolase and Carbohydrate binding module 8

Glycosyl hydrolase (GH) linked to a Carbohydrate-binding module (CBM) 8
MWexperimental 35 kDa
MWexpected 36 kDa
log I(s) 4.82×10-2 4.82×10-3 4.82×10-4 4.82×10-5
Glycosyl hydrolase (GH) linked to a Carbohydrate-binding module (CBM) 8 small angle scattering data  s, nm-1
ln I(s)
Glycosyl hydrolase (GH) linked to a Carbohydrate-binding module (CBM) 8 Guinier plot ln 4.82×10-2 Rg: 2.9 nm 0 (2.9 nm)-2 s2
(sRg)2I(s)/I(0)
Glycosyl hydrolase (GH) linked to a Carbohydrate-binding module (CBM) 8 Kratky plot 1.104 0 √3 sRg

Data validation


Fits and models


log I(s)
 s, nm-1
Conformational ensembles of domain–linker–domain (DLD) protein chimera consisting of Glycosyl hydrolase and Carbohydrate binding module 8 Rg histogram Rg, nm
Glycosyl hydrolase (GH) linked to a Carbohydrate-binding module (CBM) 8 MOMA FRESA model

Synchrotron SAXS data from solutions of Conformational ensembles of domain–linker–domain (DLD) protein chimera consisting of Glycosyl hydrolase and Carbohydrate binding module 8 in 50 mM Na-phosphate, 2 mM TCEP, pH 6 were collected on the SWING beam line at the SOLEIL storage ring (Saint-Aubin, France) using a Eiger 4M detector at a sample-detector distance of 2 m and at a wavelength of λ = 0.103 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 50.00 μl sample at 9.8 mg/ml was injected at a 0.20 ml/min flow rate onto a GE Superdex 200 5/150 column at 15°C. 630 successive 1 second frames were collected. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

All 50 conformers were refined using MoMa FReSa, which is available as an additional zipped file.

Glycosyl hydrolase (GH) linked to a Carbohydrate-binding module (CBM) 8 (DLD8)
Mol. type   Protein
Organism   Chimera
Olig. state   Monomer
Mon. MW   36.4 kDa
Sequence   FASTA