Plasmodium falciparum Kelch13 and its artemisinin-resistant mutants assemble as hexamers in solution: a SAXS data driven modeling study.

Goel N, Dhiman K, Kalidas N, Mukhopadhyay A, Ashish F, Bhattacharjee S, FEBS J (2022) Europe PMC

SASDNA5 – Truncated Kelch13-C580Y mutant

Kelch protein K13 (Truncated Kelch13-C580Y )
MWI(0) 383 kDa
MWexpected 397 kDa
VPorod 1800 nm3
log I(s) 7.08×104 7.08×103 7.08×102 7.08×101
Kelch protein K13 (Truncated Kelch13-C580Y ) small angle scattering data  s, nm-1
ln I(s)
Kelch protein K13 (Truncated Kelch13-C580Y ) Guinier plot ln 7.09×104 Rg: 6.4 nm 0 (6.4 nm)-2 s2
(sRg)2I(s)/I(0)
Kelch protein K13 (Truncated Kelch13-C580Y ) Kratky plot 1.104 0 3 sRg
p(r)
Kelch protein K13 (Truncated Kelch13-C580Y ) pair distance distribution function Rg: 6.9 nm 0 Dmax: 18.4 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Kelch protein K13 (Truncated Kelch13-C580Y ) GASBOR model

log I(s)
 s, nm-1
Kelch protein K13 (Truncated Kelch13-C580Y ) OTHER model

SAXS data from solutions of truncated Kelch13-C580Y mutant in phosphate buffered saline, pH 7.4 were collected using an Anton Paar SAXSpace at the CSIR Institute of Microbial Technology (IMTech; Chandigarh, India) equipped with a Mythen 1K detector at a sample-detector distance of 0.3 m and at a wavelength of λ = 0.15414 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). One solute concentration of 1.30 mg/ml was measured at 10°C. One 3600 second frame was collected. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

CAUTION: Guinier region poorly defined. CAUTION: High variance data with poorly specified errors. CAUTION: Error estimates are recorded as negative throughout the dataset. CAUTION: Molecular weight estimates are highly variable, in the range of 220-380 kDa. CAUTION: Data are missing from the fit of the atomistic model (bottom) to the data.

Kelch protein K13 (Truncated Kelch13-C580Y ) (TrK13_C580Y)
Mol. type   Protein
Organism   Plasmodium falciparum (isolate 3D7)
Olig. state   Hexamer
Mon. MW   66.1 kDa
 
UniProt   Q8IDQ2 (189-726)
Sequence   FASTA