Assembly of higher-order SMN oligomers is essential for metazoan viability and requires an exposed structural motif present in the YG zipper dimer.

Gupta K, Wen Y, Ninan NS, Raimer AC, Sharp R, Spring AM, Sarachan KL, Johnson MC, Van Duyne GD, Matera AG, Nucleic Acids Res 49(13):7644-7664 (2021) Europe PMC

SASDL75 – Maltose Binding Protein (MBP) fused to Drosophila Melanogaster SMN186–220: Tetramer analyzed by SVD-EFA SEC-SAXS

Survival motor neuron protein
Maltose/maltodextrin-binding periplasmic protein
MWexperimental 239 kDa
MWexpected 189 kDa
VPorod 340 nm3
log I(s) 2.23×103 2.23×102 2.23×101 2.23×100
Survival motor neuron protein Maltose/maltodextrin-binding periplasmic protein small angle scattering data  s, nm-1
ln I(s)
Survival motor neuron protein Maltose/maltodextrin-binding periplasmic protein Guinier plot ln 2.24×103 Rg: 3.9 nm 0 (3.9 nm)-2 s2
(sRg)2I(s)/I(0)
Survival motor neuron protein Maltose/maltodextrin-binding periplasmic protein Kratky plot 1.104 0 3 sRg
p(r)
Survival motor neuron protein Maltose/maltodextrin-binding periplasmic protein pair distance distribution function Rg: 4.1 nm 0 Dmax: 11.3 nm

Data validation


There are no models related to this curve.

Synchrotron SAXS data from solutions of an MBP-Survival motor neuron protein fusion in 20 mM Na/KPO4 pH 7.0, 300 mM NaCl, 1 mM DTT, were collected on the 12.3.1 (SIBYLS) beam line at the Advanced Light Source (ALS; Berkeley, CA, USA) using a Pilatus3 X 2M detector at a sample-detector distance of 1.5 m and at a wavelength of λ = 0.103 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 60.00 μl sample at 2.5 mg/ml was injected at a 0.50 ml/min flow rate onto a Shodex KW-800 series column at 4°C. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted.

Component SAXS profile calculated using singular value decomposition evolving factor analysis (SVD-EFA).

Survival motor neuron protein (SMN)
Mol. type   Protein
Organism   Drosophila melanogaster
Olig. state   Tetramer
Mon. MW   3.8 kDa
 
UniProt   Q9VV74 (186-220)
Sequence   FASTA
 
Maltose/maltodextrin-binding periplasmic protein (MBP)
Mol. type   Protein
Organism   Escherichia coli (strain K12)
Olig. state   Tetramer
Mon. MW   43.4 kDa
 
UniProt   P0AEX9 (1-396)
Sequence   FASTA