Cloning, overexpression, purification and crystallization of the CRN12 coiled-coil domain from Leishmania donovani.

ABSTRACT: Leishmania donovani coronin CRN12 is an actin-binding protein which consists of two domains: an N-terminal WD repeat domain and a C-terminal coiled-coil domain. The coiled-coil domain is 53 residues in length. Helix-helix interactions in general and coiled coils in particular are ubiquitous in the structure of proteins and play a significant role in the association among proteins, including supramolecular assemblies and transmembrane receptors that mediate cellular signalling, transport and actin dynamics. The L. donovani coronin CRN12 coiled-coil domain (5.8?kDa) was cloned, overexpressed, purified to homogeneity and the N-terminal 6×His tag was successfully removed by thrombin cleavage. Crystals of recombinant L. donovani coronin CRN12 coiled-coil domain were grown by vapour diffusion using a hanging-drop setup. Diffraction-quality crystals were obtained and data extending to 2.46?Å resolution were collected at 100?K on BM14, ESRF, Grenoble, France. The crystal belonged to the monoclinic space group C2, with unit-cell parameters a = 118.0, b = 50.6, c = 46.0?Å, ? = 111.0°. Matthews coefficient (VM) calculations suggested the presence of 4-6 molecules in the asymmetric unit, corresponding to a solvent content of ?33-55%, and are consistent with self-rotation function calculations.

SUBMITTER: Srivastava VK 

PROVIDER: S-EPMC3660895 | biostudies-literature | 2013 May

REPOSITORIES: biostudies-literature