Structural and biophysical insights into RomR, MglB and MglC interactions involved in regulating cell polarity in Myxococcus xanthus

Kodesia A, Kapoor S, Thakur K, Journal of Biological Chemistry :110907 (2025) DOI

SASDXU4 – Mutual gliding motility protein C and B interacting with the C-terminal helix of RomR protein from Myxococcus xanthus

Two-component system response regulator
Mutual gliding motility protein C
Gliding motility protein MglB
MWexperimental 121 kDa
MWexpected 90 kDa
VPorod 204 nm3
log I(s) 2.12×102 2.12×101 2.12×100 2.12×10-1
Two-component system response regulator Mutual gliding motility protein C Gliding motility protein MglB small angle scattering data  s, nm-1
ln I(s)
Two-component system response regulator Mutual gliding motility protein C Gliding motility protein MglB Guinier plot ln 2.12×102 Rg: 3.8 nm 0 (3.8 nm)-2 s2
(sRg)2I(s)/I(0)
Two-component system response regulator Mutual gliding motility protein C Gliding motility protein MglB Kratky plot 1.104 0 3 sRg
p(r)
Two-component system response regulator Mutual gliding motility protein C Gliding motility protein MglB pair distance distribution function Rg: 3.8 nm 0 Dmax: 13.6 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Two-component system response regulator Mutual gliding motility protein C Gliding motility protein MglB GASBOR model

Synchrotron SAXS data from solutions of Mutual gliding motility protein C and B interacting with the C-terminal helix of RomR protein from Myxococcus xanthus in 20 mM HEPES, 150 mM NaCl, 10% glycerol, pH 8 were collected on the BM29 beam line at the ESRF storage ring (Grenoble, France) using a Pilatus3 2M detector at a sample-detector distance of 2.8 m and at a wavelength of λ = 0.0991 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 50.00 μl sample at 1 mg/ml was injected at a 0.60 ml/min flow rate onto a Agilent AdvanceBio SEC 300Å, 4.6 x 150 mm column at 4°C. 750 successive 2 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.

Two-component system response regulator (RomR(371-420))
Mol. type   Protein
Organism   Myxococcus xanthus DK 1622
Olig. state   Trimer
Mon. MW   8.7 kDa
 
UniProt   A0AAE6G1Y1
Sequence   FASTA
 
Mutual gliding motility protein C (MglC)
Mol. type   Protein
Organism   Myxococcus xanthus (strain DK1622)
Olig. state   Dimer
Mon. MW   15.9 kDa
 
UniProt   Q1D0B6
Sequence   FASTA
 
Gliding motility protein MglB (MglB)
Mol. type   Protein
Organism   Myxococcus xanthus (strain DK1622)
Olig. state   Dimer
Mon. MW   16.1 kDa
 
UniProt   Q1DB03 (11-133)
Sequence   FASTA