The ParE2-PaaA2 toxin-antitoxin complex from Escherichia coli O157 forms a heterodocecamer in solution and in the crystal

被引：9

作者：

Sterckx, Yann G. J. ^{[1
,2
]}

Garcia-Pino, Abel ^{[1
,2
]}

Haesaerts, Sarah ^{[1
,2
]}

Jove, Thomas ^{[3
]}

Geerts, Lieselotte ^{[1
]}

Sakellaris, Viktor ^{[1
]}

Van Melderen, Laurence ^{[3
]}

Loris, Remy ^{[1
,2
]}

机构：

[1] Vrije Univ Brussel, Dept Biotechnol, B-1050 Brussels, Belgium

[2] VIB, Dept Biol Struct, Mol Recognit Unit, B-1050 Brussels, Belgium

[3] Univ Libre Bruxelles, B-6041 Gosselies, Belgium

来源：

ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS | 2012年 / 68卷

关键词：

toxin-antitoxin modules; gyrase poisons; intrinsic disorder; INHIBITS TRANSLATION; MESSENGER-RNAS; CELL-DEATH; PROTEIN; SYSTEMS; DNA; PARD; GYRASE; MODULE; MAZF;

D O I：

10.1107/S1744309112015230

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

Escherichia coli O157 paaR2-paaA2-parE2 constitutes a unique three-component toxinantitoxin (TA) module encoding a toxin (ParE2) related to the classic parDE family but with an unrelated antitoxin called PaaA2. The complex between PaaA2 and ParE2 was purified and characterized by analytical gel filtration, dynamic light scattering and small-angle X-ray scattering. It consists of a particle with a radius of gyration of 3.95 nm and is likely to form a heterododecamer. Crystals of the ParE2PaaA2 complex diffract to 3.8 angstrom resolution and belong to space group P3121 or P3221, with unit-cell parameters a = b = 142.9, c = 87.5 angstrom. The asymmetric unit is consistent with a particle of around 125 kDa, which is compatible with the solution data. Therefore, the ParE2PaaA2 complex is the largest toxinantitoxin complex identified to date and its quaternary arrangement is likely to be of biological significance.

引用

页码：724 / 729

页数：6

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