The flexibility of a homeodomain transcription factor heterodimer and its allosteric regulation by DNA binding.

Mathiasen L, Valentini E, Boivin S, Cattaneo A, Blasi F, Svergun DI, Bruckmann C, FEBS J 283(16):3134-54 (2016) Europe PMC

SASDAP7 – PBX1-PREB1 complex

Pre-B-cell leukemia transcription factor 1
Homeobox protein PKNOX1
MWI(0) 77 kDa
MWexpected 73 kDa
VPorod 143 nm3
log I(s) 1.58×103 1.58×102 1.58×101 1.58×100
Pre-B-cell leukemia transcription factor 1 Homeobox protein PKNOX1 small angle scattering data  s, nm-1
ln I(s)
Pre-B-cell leukemia transcription factor 1 Homeobox protein PKNOX1 Guinier plot ln 1.58×103 Rg: 5.8 nm 0 (5.8 nm)-2 s2
(sRg)2I(s)/I(0)
Pre-B-cell leukemia transcription factor 1 Homeobox protein PKNOX1 Kratky plot 1.104 0 3 sRg
p(r)
Pre-B-cell leukemia transcription factor 1 Homeobox protein PKNOX1 pair distance distribution function Rg: 5.7 nm 0 Dmax: 19 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Pre-B-cell leukemia transcription factor 1 Homeobox protein PKNOX1 DAMMIF model

Synchrotron SAXS data from solutions of PBX1-PREB1 complex in 20 mM Tris-HCl 150 mM NaCl 5% glycerol 1 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 3.1 m and at a wavelength of λ = 0.12 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). Solute concentrations ranging between 1.5 and 2.8 mg/ml were measured . 50 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.

Cell temperature = UNKNOWN. Storage temperature = UNKNOWN

Pre-B-cell leukemia transcription factor 1 (PBX1)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   34.5 kDa
 
UniProt   P40424 (1-308)
Sequence   FASTA
 
Homeobox protein PKNOX1 (PREP1)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   38.3 kDa
 
UniProt   P55347 (1-344)
Sequence   FASTA