title: A proteome analysis of Corynebacterium glutamicum after exposure to the herbicide 2,4-dichlorophenoxy acetic acid (2,4-D).
abstract: The herbicide 2,4-dichlorophenoxy acetic acid (2,4-D) induces a wide spectrum of toxic responses in living organisms. In this study, we analyzed the stress-induced responses of Corynebacterium glutamicum cells on protein level upon treatment with 2,4-D. For this, growing C. glutamicum cells were exposed to sublethal concentrations of 2,4-D, and changes of the gene expression profiles in comparison to non-exposed organisms were analyzed by two-dimensional gel electrophoresis and mass spectrometry. 2,4-D induced the over-expression of at least six C. glutamicum proteins, four of which could be identified by MALDI-TOF-MS. One protein (Cg2521; long-chain acyl-CoA synthetase) was related to the energy metabolism, and two proteins were involved in cell envelope synthesis (Cg2410; glutamine-dependent amidotransferase, and Cg1672; glycosyltransferase). The last induced protein was the ABC type transport system (Cg2695, ATPase component). The newly observed proteins, except for the ABC transport system, were not in general stress-related proteins, but were specifically expressed upon 2,4-D exposure and, therefore, can be used as respective biomarkers. Moreover, since these proteins seem to play a pivotal role in the adaptation of the cell to 2,4-D, they may help to gain deeper insight into the damage mechanisms of 2,4-D induced in the living cell.
authors.affiliation: Technical University of Munich, Department for Chemical-Technical Analysis, Research Center for Brewing and Food Quality, Weihenstephaner Steig 23, D-85354 Freising-Weihenstephan, Germany.
authors.forename: Ali
authors.initials: A
authors.lastname: Fanous
authors.forename: Florian
authors.initials: F
authors.lastname: Weiland
authors.forename: Carsten
authors.initials: C
authors.lastname: Lück
authors.forename: Angelika
authors.initials: A
authors.lastname: Görg
authors.forename: Albrecht
authors.initials: A
authors.lastname: Friess
authors.forename: Harun
authors.initials: H
authors.lastname: Parlar
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000633:toxicity*; D000222:Adaptation, Physiological; D001426:Bacterial Proteins / Q000378:metabolism*; D048230:Corynebacterium glutamicum / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D006540:Herbicides / Q000633:toxicity*; D020543:Proteome
chemical_list: D001426:Bacterial Proteins; D006540:Herbicides; D020543:Proteome; D015084:2,4-Dichlorophenoxyacetic Acid