Tandem engagement of phosphotyrosines by the dual SH2 domains of p120RasGAP.

Stiegler AL, Vish KJ, Boggon TJ, Structure (2022) Europe PMC

SASDPN4 – Doubly Phosphorylated p190RhoGAP Peptide Bound to p120RasGAP's SH2-SH3-SH2 Domains

Ras GTPase-activating protein 1
Rho GTPase-activating protein 35
MWexperimental 34 kDa
MWexpected 104 kDa
VPorod 41 nm3
log I(s) 1.13×10-2 1.13×10-3 1.13×10-4 1.13×10-5
Ras GTPase-activating protein 1 Rho GTPase-activating protein 35 small angle scattering data  s, nm-1
ln I(s)
Ras GTPase-activating protein 1 Rho GTPase-activating protein 35 Guinier plot ln 1.14×10-2 Rg: 2.4 nm 0 (2.4 nm)-2 s2
(sRg)2I(s)/I(0)
Ras GTPase-activating protein 1 Rho GTPase-activating protein 35 Kratky plot 1.104 0 3 sRg
p(r)
Ras GTPase-activating protein 1 Rho GTPase-activating protein 35 pair distance distribution function Rg: 2.4 nm 0 Dmax: 7.9 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Ras GTPase-activating protein 1 Rho GTPase-activating protein 35 DAMMIF model

log I(s)
 s, nm-1
Ras GTPase-activating protein 1 Rho GTPase-activating protein 35 PYMOL model

log I(s)
 s, nm-1

On the day of data collection the samples were thawed and spun down. 1 mM DTT was added to the samples and buffer. The samples were injected onto a GE Superdex 200 Increase column at 22˚C in buffer containing 20 mM Tris pH 8, 350 mM NaCl, 1 mM DTT at a flow rate of 0.5 mL/min. Data were collected at APS’s BioCAT Beamline18ID using synchrotron radiation from Undulator A. As the sample came off of the column it was first detected by UV, followed by Wyatt DAWN HELEOS II MALS+DLS and Wyatt Optilab T-rEX dRI detectors for measuring molecular weight through MALS-DLS-RI analysis. Following MALS-DLS, the sample flowed to the SAXS sample chamber where data were collected by a Pilatus3 X 1M detector with a wavelength of 1.033 Å, camera length of 3.628 m, an exposure time of 0.5 s, and a q-measurement range of 0.0045 to 0.35 Å-1. Data were normalized using an active beamstop containing a silicon PIN diode.

Ras GTPase-activating protein 1 (p120RasGAP)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   100.8 kDa
 
UniProt   P20936 (174-1047)
Sequence   FASTA
 
Rho GTPase-activating protein 35 (p190RhoGAP)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   3.3 kDa
 
UniProt   Q9NRY4 (1083-1111)
Sequence   FASTA