3ZBE

E. coli O157 ParE2-associated antitoxin 2 (PaaA2)

Summary for 3ZBE

• Entry DOI: 10.2210/pdb3zbe/pdb
• NMR Information: BMRB: 18841
• Descriptor: PAAA2 (1 entity in total)
• Functional Keywords: toxin-antitoxin, partially disordered protein, saxs/nmr
• Biological source: ESCHERICHIA COLI O157\:H7
• Total number of polymer chains: 1
• Total formula weight: 8473.46

Authors

Sterckx, Y.G.J.,Van Nuland, N.A.J.,Vranken, W.F.,Loris, R. (deposition date: 2012-11-08, release date: 2014-01-15, Last modification date: 2024-01-31)

Primary citation

Sterckx, Y.G.,Volkov, A.N.,Vranken, W.F.,Kragelj, J.,Jensen, M.R.,Buts, L.,Garcia-Pino, A.,Jove, T.,Van Melderen, L.,Blackledge, M.,Van Nuland, N.A.,Loris, R.
Small-Angle X-Ray Scattering- and Nuclear Magnetic Resonance-Derived Conformational Ensemble of the Highly Flexible Antitoxin Paaa2.
Structure, 22:854-, 2014

PubMed Abstract: Antitoxins from prokaryotic type II toxin-antitoxin modules are characterized by a high degree of intrinsic disorder. The description of such highly flexible proteins is challenging because they cannot be represented by a single structure. Here, we present a combination of SAXS and NMR data to describe the conformational ensemble of the PaaA2 antitoxin from the human pathogen E. coli O157. The method encompasses the use of SAXS data to filter ensembles out of a pool of conformers generated by a custom NMR structure calculation protocol and the subsequent refinement by a block jackknife procedure. The final ensemble obtained through the method is validated by an established residual dipolar coupling analysis. We show that the conformational ensemble of PaaA2 is highly compact and that the protein exists in solution as two preformed helices, connected by a flexible linker, that probably act as molecular recognition elements for toxin inhibition.

PubMed: 24768114
DOI: 10.1016/J.STR.2014.03.012

Experimental method

SOLUTION NMR