Expression, crystallization and preliminary crystallographic data analysis of PigI, a putative L-prolyl-AMP ligase from the prodigiosin synthetic pathway in Serratia.

ABSTRACT: Prodigiosin, a member of the prodiginines, is a tripyrrole red pigment synthesized by Serratia and some other microbes. A bifurcated biosynthesis pathway of prodigiosin has been proposed in Serratia in which MBC (4-methoxy-2,2'-bipyrrole-5-carbaldehyde) and MAP (2-methyl-3-N-amyl-pyrrole) are synthesized separately and then condensed by PigC to form prodigiosin. The first step for the synthesis of MBC is the activation of L-proline by PigI, but its catalytic mechanism has remained elusive. To elucidate its mechanism, recombinant PigI was purified and crystallized. Crystals obtained by the sitting-drop method belonged to space group P1 and diffracted to 2.0 Å resolution, with unit-cell parameters a = 51.2, b = 62.8, c = 91.3 Å, ? = 105.1, ? = 90.1, ? = 92.2°. Matthews coefficient analysis suggested two molecules in the asymmetric unit, with a VM of 2.6 Å(3) Da(-1) and a solvent content of 52.69%.

SUBMITTER: Han N 

PROVIDER: S-EPMC4014333 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature