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M. Pagels, S. Fuchs, J. Pané-Farré, C. Kohler, L. Men- schner, M. Hecker, P. J. McNamarra, M. C. Bauer, C. von Wachenfeldt, M. Liebeke, M. Lalk, G. Sander, C. von Eiff, R. A. Proctor and S. Engelmann, “Redox Sensing by a Rex-family Repressor is Involved in the Regulation of Anaerobic Gene Expression in Staphylococcus aureus,” Molecular Microbiology, Vol. 76, No. 5, 2010, pp. 1142-1161. doi:10.1111/j.1365-2958.2010.07105.x

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• TITLE: Over-Production of P60 Family Proteins, Glycolytic and Stress Response Proteins Characterizes the Autolytic Profile of Listeria monocytogenes

  AUTHORS: Elsa Pinto, Natália Marques, Peter W. Andrew, M. Leonor Faleiro

  KEYWORDS: Listeria monocytogenes; Autolysis Proteome; Stress Proteins

  JOURNAL NAME: Advances in Microbiology, Vol.2 No.2, June 13, 2012

  ABSTRACT: Listeria monocytogenes is a foodborne pathogen capable of surviving under challenging conditions both outside and inside the host. During the transition from exponential to stationary phase it experiences a series of environmental changes that require an appropriate response to maintain cell viability. In this study the autolytic behaviour of a L. monocytogenes strain was investigated by two-dimensional electrophoresis. The study was done at the permissive autolysis temperature, 30℃ and at 20℃, an autolysis non-permissive temperature. An autolytic strain proteome was also compared to a non-autolytic strain at the permissive autolysis temperature. The autolytic strain proteome at 30℃ in comparison to 20℃ evidenced increased synthesis of the P60 autolysin, glycolytic enzymes and proteins related with environmental stress responses. The over-production of P45 autolysin, was observed when the autolytic strain proteome was compared with the non-autolytic strain. The proteomes at the non-permissive temperature and the proteome of the non-autolytic strain were characterized by a diminished synthesis of several stress related proteins. The lack of autolysis seems to be associated to the over-production of proteins linked to fatty acid and amino acid synthesis, transcription regulation and cell morphogenesis as evidenced by the proteome at the non-permissive temperature and the non-autolytic strain. Autolysis proteome evidenced the over-production of P60 autolysins, glycolysis and stress proteins whereas the proteome obtained in conditions of absence of autolysis reveal a completely different group of proteins. Possible targets to activate listerial autolysis were identified.