Production, crystallization and X-ray diffraction analysis of a complex between a fragment of the TssM T6SS protein and a camelid nanobody - Archive ouverte HAL Access content directly
Journal Articles Acta crystallographica Section F : Structural biology communications [2014-...] Year : 2015

Production, crystallization and X-ray diffraction analysis of a complex between a fragment of the TssM T6SS protein and a camelid nanobody

van Son Nguyen
Silvia Spinelli
  • Function : Author
Aline Desmyter
  • Function : Author
Thi Thu Hang Le
  • Function : Author
Christine Kellenberger
Christian Cambillau
Alain Roussel

Abstract

The type VI secretion system (T6SS) is a machine evolved by Gram-negative bacteria to deliver toxin effectors into target bacterial or eukaryotic cells. The T6SS is functionally and structurally similar to the contractile tail of the Myoviridae family of bacteriophages and can be viewed as a syringe anchored to the bacterial membrane by a transenvelope complex. The membrane complex is composed of three proteins: the TssM and TssL inner membrane components and the TssJ outer membrane lipoprotein. The TssM protein is central as it interacts with both TssL and TssJ, therefore linking the membranes. Using controlled trypsinolysis, a 32.4 kDa C-terminal fragment of enteroaggregative Escherichia coli TssM (TssM 32Ct ) was purified. A nanobody obtained from llama immunization, nb25, exhibited subnanomolar affinity for TssM 32Ct . Crystals of the TssM 32Ct –nb25 complex were obtained and diffracted to 1.9 Å resolution. The crystals belonged to space group P 6 4 , with unit-cell parameters a = b = 95.23, c = 172.95 Å. Molecular replacement with a model nanobody indicated the presence of a dimer of TssM 32Ct –nb25 in the asymmetric unit.

Dates and versions

hal-03274772 , version 1 (30-06-2021)

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van Son Nguyen, Silvia Spinelli, Aline Desmyter, Thi Thu Hang Le, Christine Kellenberger, et al.. Production, crystallization and X-ray diffraction analysis of a complex between a fragment of the TssM T6SS protein and a camelid nanobody. Acta crystallographica Section F : Structural biology communications [2014-..], 2015, 71 (3), pp.266-271. ⟨10.1107/S2053230X15000709⟩. ⟨hal-03274772⟩
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