Decoupling of size and shape fluctuations in heteropolymeric sequences reconciles discrepancies in SAXS vs. FRET measurements.

Fuertes G, Banterle N, Ruff KM, Chowdhury A, Mercadante D, Koehler C, Kachala M, Estrada Girona G, Milles S, Mishra A, Onck PR, Gräter F, Esteban-Martín S, Pappu RV, Svergun DI, Lemke EA, Proc Natl Acad Sci U S A 114(31):E6342-E6351 (2017) Europe PMC

SASDEM2 – Unlabeled Nuclear Localization Signal (NLS) from the inner nuclear membrane protein HEH2 without denaturant

Inner nuclear membrane protein HEH2
MWexperimental 9 kDa
MWexpected 5 kDa
VPorod 16 nm3
log I(s) 1.81×102 1.81×101 1.81×100 1.81×10-1
Inner nuclear membrane protein HEH2 small angle scattering data  s, nm-1
ln I(s)
Inner nuclear membrane protein HEH2 Guinier plot ln 1.81×102 Rg: 2.4 nm 0 (2.4 nm)-2 s2
(sRg)2I(s)/I(0)
Inner nuclear membrane protein HEH2 Kratky plot 1.104 0 √3 sRg
p(r)
Inner nuclear membrane protein HEH2 pair distance distribution function Rg: 2.7 nm 0 Dmax: 11.6 nm

Data validation

Fits and models

log I(s)
 s, nm-1
Unlabeled Nuclear Localization Signal (NLS) from the inner nuclear membrane protein HEH2 without denaturant Rg histogram Rg, nm
Inner nuclear membrane protein HEH2 OTHER model
Inner nuclear membrane protein HEH2 OTHER model
Inner nuclear membrane protein HEH2 OTHER model
Inner nuclear membrane protein HEH2 OTHER model
Inner nuclear membrane protein HEH2 OTHER model
Inner nuclear membrane protein HEH2 OTHER model
Synchrotron SAXS data from solutions of Unlabeled Nuclear Localization Signal (NLS) from the inner nuclear membrane protein HEH2 without denaturant in 25 mM HEPES, 150 mM NaCl, 10 mM DTT, pH 7.4 were collected on the EMBL P12 beam line at the PETRA III storage ring (DESY; Hamburg, Germany) using a Pilatus 2M detector at a sample-detector distance of 3 m and at a wavelength of λ = 0.1 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). Solute concentrations ranging between 2 and 7.5 mg/ml were measured at 23°C. 20 successive 0.050 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. The low angle data collected at lower concentration were merged with the highest concentration high angle data to yield the final composite scattering curve.

The protein contains a penultimate non-canonical amino acid p-acetylphenylalanine (207 Da) that is represented as U (selenocysteine, 168 Da) in the amino acid sequence for the entry. Therefore, the calculated MW from sequence (MW(expected)) must be adjusted accordingly (ca. 40 Da).

Tags: idp
Inner nuclear membrane protein HEH2 (NLS)
Mol. type   Protein
Organism   Saccharomyces cerevisiae
Olig. state   Monomer
Mon. MW   5.4 kDa
 
UniProt   Q03281 (99-140)
Sequence   FASTA