Size-exclusion chromatography small-angle X-ray scattering of water soluble proteins on a laboratory instrument

Bucciarelli S, Midtgaard S, Nors Pedersen M, Skou S, Arleth L, Vestergaard B, Journal of Applied Crystallography 51(6) (2018) DOI

SASDE45 – Conalbumin monomer from in-house SEC-SAXS

MWexperimental 76 kDa
MWexpected 76 kDa
VPorod 100 nm3
log I(s) 4.89×10-1 4.89×10-2 4.89×10-3 4.89×10-4
Ovotransferrin small angle scattering data  s, nm-1
ln I(s)
Ovotransferrin Guinier plot ln 4.89×10-1 Rg: 3.0 nm 0 (3.0 nm)-2 s2
Ovotransferrin Kratky plot 1.104 0 3 sRg
Ovotransferrin pair distance distribution function Rg: 3.0 nm 0 Dmax: 10.1 nm

Data validation

Fits and models

log I(s)
 s, nm-1
Ovotransferrin PDB model

log I(s)
 s, nm-1
Ovotransferrin DAMFILT model

SAXS data from solutions of Conalbumin monomer from in-house SEC-SAXS in PBS, pH 7.4 were collected on a Xenocs BioXolver L instrument at the Copenhagen University, Department of Drug Design and Pharmacology (Copenhagen, Denmark) using a 20Hz Pilatus 300K detector at a sample-detector distance of 0.7 m and at a wavelength of λ = 0.134 nm (l(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle).

The CA sample (500 microlitres at 5.1 mg/ml) was injected onto a GE Healthcare S200 Increase 10/300 (24 ml) column at a flow rate of 0.1 ml/min at 23°C. A total of 150 x 30 second SAXS data frames were recorded throughout the CA elution. After background solvent corrections, SEC-SAXS data frames 87-96, corresponding to monomeric OVA, were scaled, averaged and binned logarithmically to produce the data displayed in this entry. Additional files, including plots of the selected frames and of I(0), HPLC and exposure cell UV traces and Rg vs. time (determined by AUTORG) are included in the additional files of the full entry zip archive.

Ovotransferrin (CA)
Mol. type   Protein
Organism   Gallus gallus
Olig. state   Monomer
Mon. MW   75.8 kDa
UniProt   P02789 (20-705)
Sequence   FASTA
PDB code   1AIV