Crystallization and preliminary structure determination of the transfer protein TraM from the Gram-positive conjugative plasmid pIP501.

ABSTRACT: The major means of horizontal gene spread (e.g. of antibiotic resistance) is conjugative plasmid transfer. It presents a serious threat especially for hospitalized and immuno-suppressed patients, as it can lead to the accelerated spread of bacteria with multiple antibiotic resistances. Detailed information about the process is available only for bacteria of Gram-negative (G-) origin and little is known about the corresponding mechanisms in Gram-positive (G+) bacteria. Here we present the purification, biophysical characterization, crystallization and preliminary structure determination of the TraM C-terminal domain (TraM?, comprising residues 190-322 of the full-length protein), a putative transfer protein from the G+ conjugative model plasmid pIP501. The crystals diffracted to 2.5 Å resolution and belonged to space group P1, with unit-cell parameters a = 39.21, b = 54.98, c = 93.47 Å, ? = 89.91, ? = 86.44, ? = 78.63° and six molecules per asymmetric unit. The preliminary structure was solved by selenomethionine single-wavelength anomalous diffraction.

SUBMITTER: Goessweiner-Mohr N 

PROVIDER: S-EPMC3564624 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature