title: Purification and characterization of a prolidase from Lactobacillus casei subsp. casei IFPL 731.
abstract: A peptidase showing a high level of specificity towards dipeptides of the X-Pro type was purified to homogeneity from the cell extract of Lactobacillus casei subsp. casei IFPL 731. The enzyme was a monomer having a molecular mass of 41 kDa. The pH and temperature optima were 6.5 to 7.5 and 55 degrees C, respectively. Metal chelating agents completely inhibited enzyme activity, indicating that the prolidase was a metalloenzyme. The Michaelis constant (K(m)) and Vmax for several proline-containing dipeptides were determined.
authors.affiliation: Instituto del Frío (CSIC), Ciudad Universitaria, Madrid, Spain. ifrmh27@fresno.csic.es
authors.forename: M D
authors.initials: MD
authors.lastname: Fernández-Esplá
authors.forename: M C
authors.initials: MC
authors.lastname: Martín-Hernández
authors.forename: P F
authors.initials: PF
authors.lastname: Fox
mesh_terms: D000595:Amino Acid Sequence; D002614:Chelating Agents / Q000494:pharmacology; D004150:Dipeptidases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007780:Lacticaseibacillus casei / Q000201:enzymology*; D008670:Metals / Q000494:pharmacology; D008970:Molecular Weight; D009842:Oligopeptides / Q000737:chemistry; D013379:Substrate Specificity; D013696:Temperature
chemical_list: D002614:Chelating Agents; D004791:Enzyme Inhibitors; D008670:Metals; D009842:Oligopeptides; D004150:Dipeptidases; C022449:proline dipeptidase