[Fe-S] cluster biogenesis and unusual assembly of the ISC scaffold complex in Plasmodium falciparum mitochondrion

Ravishankar Ramachandran.

SASDJN7 – Cysteine desulfurase, Iron-sulfur cluster assembly protein (IscS_IscU) complex

Iron-sulfur cluster assembly protein
Cysteine desulfurase, putative
MWexperimental 271 kDa
MWexpected 260 kDa
VPorod 1100 nm3
log I(s) 1.02×105 1.02×104 1.02×103 1.02×102
Iron-sulfur cluster assembly protein Cysteine desulfurase, putative small angle scattering data  s, nm-1
ln I(s)
Iron-sulfur cluster assembly protein Cysteine desulfurase, putative Guinier plot ln 1.03×105 Rg: 6.4 nm 0 (6.4 nm)-2 s2
(sRg)2I(s)/I(0)
Iron-sulfur cluster assembly protein Cysteine desulfurase, putative Kratky plot 1.104 0 3 sRg
p(r)
Iron-sulfur cluster assembly protein Cysteine desulfurase, putative pair distance distribution function Rg: 6.3 nm 0 Dmax: 17.6 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Iron-sulfur cluster assembly protein Cysteine desulfurase, putative DAMMIF model

SAXS data from solutions of the IscS_IscU complex in 50 mM Tris-Cl, 300 mM NaCl, 5% Glycerol, pH 7.5 were collected using an Anton Paar SAXSpace instrument at the CSIR-Central Drug Research Institute (Lucknow, India) equipped with a Dectris Mythen 2R1K detector at a sample-detector distance of 0.3 m and at a wavelength of λ = 0.154 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). One solute concentration of 3.00 mg/ml was measured at 9.8°C. Two successive 30 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.

CAUTION: The error on Rg is over 5 nm. CAUTION! Errors are severely over estimated! CAUTION! Porod volume is inconsistent with the quoted MW of 270 kDa.

Iron-sulfur cluster assembly protein (IscU)
Mol. type   Protein
Organism   Plasmodium falciparum (isolate 3D7)
Olig. state   Tetramer
Mon. MW   13.9 kDa
 
UniProt   Q8IKT4 (37-162)
Sequence   FASTA
 
Cysteine desulfurase, putative (IscS)
Mol. type   Protein
Organism   Plasmodium falciparum (isolate 3D7)
Olig. state   Tetramer
Mon. MW   51.1 kDa
 
UniProt   Q8IBI5 (104-553)
Sequence   FASTA