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

Ravishankar Ramachandran.

SASDJP7 – Cysteine desulfurase, Iron-sulfur cluster assembly protein, Protein ISD11 (IscS_IscU_Isd11) complex

Cysteine desulfurase, putative
Iron-sulfur cluster assembly protein
Protein ISD11
MWexperimental 309 kDa
MWexpected 302 kDa
VPorod 950 nm3
log I(s) 1.01×105 1.01×104 1.01×103 1.01×102
Cysteine desulfurase, putative Iron-sulfur cluster assembly protein Protein ISD11 small angle scattering data  s, nm-1
ln I(s)
Cysteine desulfurase, putative Iron-sulfur cluster assembly protein Protein ISD11 Guinier plot ln 1.02×105 Rg: 7.1 nm 0 (7.1 nm)-2 s2
(sRg)2I(s)/I(0)
Cysteine desulfurase, putative Iron-sulfur cluster assembly protein Protein ISD11 Kratky plot 1.104 0 3 sRg
p(r)
Cysteine desulfurase, putative Iron-sulfur cluster assembly protein Protein ISD11 pair distance distribution function Rg: 6.3 nm 0 Dmax: 17.9 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Cysteine desulfurase, putative Iron-sulfur cluster assembly protein Protein ISD11 DAMMIF model

SAXS data from solutions of the IscS_IscU_Isd11 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 10°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 (from Guinier) exceeds 1.5 nm. CAUTION! Porod volume is inconsistent with the quoted MW of 309 kDa.

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
 
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
 
Protein ISD11 (Isd11)
Mol. type   Protein
Organism   Plasmodium falciparum (isolate 3D7)
Olig. state   Tetramer
Mon. MW   10.6 kDa
 
UniProt   Q8IEK7 (1-87)
Sequence   FASTA