Structural basis of client specificity in mitochondrial membrane-protein chaperones.

Sučec I, Wang Y, Dakhlaoui O, Weinhäupl K, Jores T, Costa D, Hessel A, Brennich M, Rapaport D, Lindorff-Larsen K, Bersch B, Schanda P, Sci Adv 6(51) (2020) Europe PMC

SASDJP4 – Mitochondrial import inner membrane translocase subunits TIM9-TIM10 in complex with TIM23

Mitochondrial import inner membrane translocase subunit TIM9
Mitochondrial import inner membrane translocase subunit TIM10
Mitochondrial import inner membrane translocase subunit TIM23
MWexperimental 86 kDa
MWexpected 85 kDa
VPorod 146 nm3
log I(s) 2.52×101 2.52×100 2.52×10-1 2.52×10-2
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 small angle scattering data  s, nm-1
ln I(s)
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 Guinier plot ln 2.53×101 Rg: 3.2 nm 0 (3.2 nm)-2 s2
(sRg)2I(s)/I(0)
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 Kratky plot 1.104 0 3 sRg
Dmax: 7.7 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model
Mitochondrial import inner membrane translocase subunit TIM9 Mitochondrial import inner membrane translocase subunit TIM10 Mitochondrial import inner membrane translocase subunit TIM23 CUSTOM IN-HOUSE model

Synchrotron SAXS data from solutions of mitochondrial import inner membrane translocase subunits TIM9-TIM10 in complex with TIM23 in 50 mM Tris, 150 mM NaCl, pH 7.4 were collected on the BM29 beam line at the ESRF (Grenoble, France) using a Pilatus 1M detector at a sample-detector distance of 2.9 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 500.00 μl sample at 2 mg/ml was injected at a 0.20 ml/min flow rate onto a GE Superdex 200 Increase 10/300 column at 25°C. 50 successive 1 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.

Mw from Porod volume.

Mitochondrial import inner membrane translocase subunit TIM9
Mol. type   Protein
Organism   Saccharomyces cerevisiae
Olig. state   Trimer
Mon. MW   10.2 kDa
 
UniProt   O74700 (1-87)
Sequence   FASTA
 
Mitochondrial import inner membrane translocase subunit TIM10
Mol. type   Protein
Organism   Saccharomyces cerevisiae
Olig. state   Trimer
Mon. MW   10.2 kDa
 
UniProt   P87108 (2-93)
Sequence   FASTA
 
Mitochondrial import inner membrane translocase subunit TIM23
Mol. type   Protein
Organism   Saccharomyces cerevisiae
Olig. state   Monomer
Mon. MW   24.0 kDa
 
UniProt   P32897 (1-222)
Sequence   FASTA