Flexible Tethering of ASPP Proteins Facilitates PP-1c Catalysis.

Zhou Y, Millott R, Kim HJ, Peng S, Edwards RA, Skene-Arnold T, Hammel M, Lees-Miller SP, Tainer JA, Holmes CFB, Glover JNM, Structure 27(10):1485-1496.e4 (2019) Europe PMC

SASDG66 – Inhibitor of apoptosis-stimulating protein of p53 (iASPP(621-828)) bound to the serine/threonine-protein phosphatase PP1-alpha catalytic subunit, compact

Serine/threonine-protein phosphatase PP1-alpha catalytic subunit
Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor)
MWexperimental 56 kDa
MWexpected 63 kDa
VPorod 116 nm3
log I(s) 3.56×102 3.56×101 3.56×100 3.56×10-1
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) small angle scattering data  s, nm-1
ln I(s)
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) Guinier plot ln 3.56×102 Rg: 3.0 nm 0 (3.0 nm)-2 s2
(sRg)2I(s)/I(0)
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) Kratky plot 1.104 0 3 sRg
p(r)
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) pair distance distribution function Rg: 3.0 nm 0 Dmax: 10.9 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) BILBOMD model
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) BILBOMD model
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) BILBOMD model

Synchrotron SAXS data from solutions of Inhibitor of apoptosis-stimulating protein of p53 (iASPP(621-828)) bound to the serine/threonine-protein phosphatase PP1-alpha catalytic subunit, compact in 25 mM Tris, 150 mM NaCl, 1 mM DTT, pH 8 were collected on the 12.3.1 (SIBYLS) beam line at the Advanced Light Source (ALS) storage ring (Berkeley, CA, USA) using a Pilatus3 X 2M detector at a sample-detector distance of 2.1 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 sample was injected at a 0.50 ml/min flow rate onto a Shodex KW-800 series column at 20°C. 600 successive 3 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.

Sample injection volume = UNKNOWN

Serine/threonine-protein phosphatase PP1-alpha catalytic subunit (PP-1cα)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   37.5 kDa
 
UniProt   P62136 (1-330)
Sequence   FASTA
 
Inhibitor of apoptosis-stimulating protein of p53 (RelA-associated inhibitor) (iASPP)
Mol. type   Protein
Organism   Homo sapiens
Olig. state   Monomer
Mon. MW   25.5 kDa
 
UniProt   Q8WUF5 (621-828)
Sequence   FASTA
 
PDB ID   6DCX
 
PDB ID   6DCX
 
PDB ID   6DCX