Beyond the VSG Layer: Exploring the Role of Intrinsic Disorder in the Invariant Surface Glycoproteins of African Trypanosomes.

Sülzen H, Volkov AN, Geens R, Zahedifard F, Stijlemans B, Zoltner M, Magez S, Sterckx YG, Zoll S, PLoS Pathog 20(4):e1012186 (2024) Europe PMC

SASDT75 – Trypanosoma brucei gambiense invariant surface glycoprotein 43 (ISG43)

T. brucei spp.-specific protein
MWexperimental 40 kDa
MWexpected 38 kDa
VPorod 53 nm3
log I(s) 7.62×101 7.62×100 7.62×10-1 7.62×10-2
T. brucei spp.-specific protein small angle scattering data  s, nm-1
ln I(s)
T. brucei spp.-specific protein Guinier plot ln 7.63×101 Rg: 3.2 nm 0 (3.2 nm)-2 s2
(sRg)2I(s)/I(0)
T. brucei spp.-specific protein Kratky plot 1.104 0 3 sRg
p(r)
T. brucei spp.-specific protein pair distance distribution function Rg: 3.3 nm 0 Dmax: 11.5 nm

Data validation


Fits and models


log I(s)
 s, nm-1
T. brucei spp.-specific protein BILBOMD model
T. brucei spp.-specific protein BILBOMD model

Synchrotron SAXS data from solutions of Trypanosoma brucei gambiense invariant surface glycoprotein 43 (ISG43) in 20 mM HEPES, 150 mM NaCl, 3% glycerol, pH 7.5 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 = 0.099 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 10.0 mg/ml was injected at a 0.20 ml/min flow rate onto a Shodex KW404-4F column at 20°C. 1000 successive 0.750 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.

For display purposes the SAXS intensities have been scaled to the model-fit data (I(s) multiplied by 1000000000).

T. brucei spp.-specific protein (ISG43)
Mol. type   Protein
Organism   Trypanosoma brucei gambiense (strain MHOM/CI/86/DAL972)
Olig. state   Monomer
Mon. MW   38.4 kDa
 
UniProt   C9ZNA4 (22-349)
Sequence   FASTA