Purification, Crystallization and Preliminary X-ray Crystallographic Analysis of Diaminopimelate Epimerase From Acinetobacter Baumannii

Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013 Jan 1;69(Pt 1):42-4. doi: 10.1107/S1744309112048506. Epub 2012 Dec 20.

Abstract

The meso isomer of diaminopimelate (meso-DAP) is a biosynthetic precursor of L-lysine in bacteria and plants, and is a key component of the peptidoglycan layer in the cell walls of Gram-negative and some Gram-positive bacteria. Diaminopimelate epimerase (DapF) is a pyridoxal-5'-phosphate-independent racemase which catalyses the interconversion of (6S,2S)-2,6-diaminopimelic acid (LL-DAP) and meso-DAP. In this study, DapF from Acinetobacter baumannii was overexpressed in Escherichia coli strain SoluBL21, purified and crystallized using a vapour-diffusion method. A native crystal diffracted to a resolution of 1.9 Å and belonged to space group P3(1) or P3(2), with unit-cell parameters a = b = 74.91, c = 113.35 Å, α = β = 90, γ = 120°. There were two molecules in the asymmetric unit.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acinetobacter baumannii / enzymology*
  • Amino Acid Isomerases / chemistry*
  • Amino Acid Isomerases / genetics
  • Amino Acid Isomerases / isolation & purification*
  • Bacterial Proteins / chemistry
  • Bacterial Proteins / genetics
  • Bacterial Proteins / isolation & purification
  • Crystallization / methods
  • Crystallography, X-Ray
  • Escherichia coli / genetics
  • Protein Conformation

Substances

  • Bacterial Proteins
  • Amino Acid Isomerases
  • diaminopimelate epimerase