Cryo-EM led analysis of open and closed conformations of Chagas vaccine candidate TcPOP.

Batra S, Olmo F, Ragan TJ, Kaplan M, Calvaresi V, Frank AM, Lancey C, Assadipapari M, Ying C, Struwe WB, Hesketh EL, Kelly JM, Barfod L, Campeotto I, Nat Commun 16(1):7164 (2025) Europe PMC

SASDW23 – SEC-SAXS of Trypanosoma cruzi Prolyl Oligopepetidase (TcPOP)

Prolyl endopeptidase
MWI(0) 75 kDa
MWexpected 78 kDa
VPorod 142 nm3
log I(s) 2.48×10-2 2.48×10-3 2.48×10-4 2.48×10-5
Prolyl endopeptidase small angle scattering data  s, nm-1
ln I(s)
Prolyl endopeptidase Guinier plot ln 2.48×10-2 Rg: 3 nm 0 (3 nm)-2 s2
(sRg)2I(s)/I(0)
Prolyl endopeptidase Kratky plot 1.104 0 3 sRg
p(r)
Prolyl endopeptidase pair distance distribution function 0 Dmax: 0.0 nm

Data validation


Fits and models


log I(s)
 s, nm-1
Prolyl endopeptidase ALPHAFOLD model

log I(s)
 s, nm-1
Prolyl endopeptidase ALPHAFOLD model

Synchrotron SAXS data from solutions of SEC-SAXS of Trypanosoma cruzi Prolyl Oligopepetidase (TcPOP) in 20 mM HEPES, 150 mM NaCl, pH 7.4 were collected on the B21 beam line at the Diamond Light Source storage ring (Didcot, UK) using a Eiger 4M detector at a sample-detector distance of 3.7 m and at a wavelength of λ = 0.09464 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 8 mg/ml was injected at a 0.08 ml/min flow rate onto a GE Superdex 200 Increase 5/150 column at 15°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.

CAUTION! Primary display data is different to the data used for modelling! CAUTION! Data used for modelling has NO GUINIER REGION, i.e., does not encompass the particle size/volume and radius of gyration! CAUTION! The models displayed in this entry were NOT used to calculate the fits to the data and therefore have no connection/relevance to the fits displayed in this entry (interpret model fits with extreme caution)!

Prolyl endopeptidase
Mol. type   Protein
Organism   Trypanosoma cruzi
Olig. state   Monomer
Mon. MW   78.3 kDa
 
UniProt   Q71MD6 (1-697)
Sequence   FASTA