title: In vitro reassembly of the malolactic fermentation pathway of Leuconostoc oenos (Oenococcus oeni).
abstract: The mechanism of metabolic energy generation by malolactic fermentation was studied with artificial membrane vesicles of Leuconostoc oenos (Oenococcus oeni). (Note that although L. oenos was recently reclassified as O. oeni [L. M. T. Dicks, F. Dellaglio, and M. D. Collins, Int. J. Syst. Bacteriol. 45:395-397, 1995], the old designation was kept in the present work.) Purified malolactic enzyme was entrapped in artificial membrane vesicles prepared from L. oenos cells able to transport L-malate. We show that the in vitro reconstituted system, including an electrogenic L-malate carrier and the decarboxylating malolactic enzyme, generated a proton motive force that was able to drive intravesicular accumulation of leucine.
authors.affiliation: Instituto de Technologia Química e Biológica, U.N.L., Oeiras, Portugal.
authors.forename: M
authors.initials: M
authors.lastname: Salema
authors.forename: I
authors.initials: I
authors.lastname: Capucho
authors.forename: B
authors.initials: B
authors.lastname: Poolman
authors.forename: M V
authors.initials: MV
authors.lastname: San Romão
authors.forename: M C
authors.initials: MC
authors.lastname: Dias
mesh_terms: D001692:Biological Transport; D002474:Cell-Free System; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000096:biosynthesis; D007930:Leucine / Q000378:metabolism; D007934:Leuconostoc / Q000378:metabolism*; D008291:Malate Dehydrogenase; D008293:Malates / Q000378:metabolism*; D008564:Membrane Potentials; D008566:Membranes / Q000378:metabolism; D018892:Proton-Motive Force
chemical_list: D008293:Malates; D019344:Lactic Acid; C030298:malic acid; C037731:malolactic enzyme; D008291:Malate Dehydrogenase; D007930:Leucine