In addition, our results showed that both races of C. lindemuthianum express the Clpnl2 gene, although some differences are observed in the timing and level of expression: the pathogenic race responds faster and at higher levels than the non-pathogenic race. This suggests that there are at least two levels of determination of the lifestyle of the microorganisms: one related to the evolution of the enzymes and one concerning Caspase Inhibitor VI ic50 the regulation

of the expression of the enzymes. In our model, one race of C. lindemuthianum behaves as a hemibiotrophic pathogen and, according to its inability to infect bean, the other race behaves as a saprophyte. Although this study included the analysis of pectin lyase 2 only, we have observed this behavior with other enzymes of the complex involved in the degradation of the cell wall suggesting that it may be a general phenomenon. The differences at this level can be part of the general response of the fungi to host components. However future studies comparing the enzymatic complex of degradation of more fungi species with different lifestyles are needed to confirm this hypothesis. Finally, we consider this type of information to be of great importance for the study of the biotechnological potential of these enzymes, as the efficiency of the Go6983 enzymes could depend on the complexity of the vegetal material to

be processed and the lifestyle of organism that is the source of enzymes and/or genes. Acknowledgements The authors thank the financial support provided by the FOMIX CONACYT-Gobierno del Estado de Michoacán (project 2009-05 Clave 116208

to HCC) and CONACYT (scholarship granted to ALM and UCS). We thank Gerardo Vázquez Marrufo by its comments to manuscript. References JAK inhibitor 1. Willats WG, McCartney L, Mackie W, Knox JP: Pectin: cell biology and prospects for functional analysis. Plant Mol Biol 2001, 47:9–27.PubMedCrossRef 2. Mohnen D: Pectin structure and biosynthesis. Curr Opin Plant Biol 2008, 11:266–277.PubMedCrossRef 3. de Vries RP, Visser J: Aspergillus enzymes involved in degradation of plant cell wall polysaccharides. Microbiol Mol Biol Rev 2001, 65:497–522.PubMedCrossRef 4. Herron SR, Benen JA, Scavetta RD, Visser J, Jurnak F: Structure and function of pectic enzymes: BAY 11-7082 cell line virulence factors of plant pathogens. Proc Natl Acad Sci USA 2000, 97:8762–8769.PubMedCrossRef 5. Jayani RS, Saxena S, Gupta R: Microbial pectinolytic enzymes: a review. Process Biochem 2005, 40:2931–2944.CrossRef 6. Prusky D, McEvoy JL, Leverentz B, Conway WS: Local modulation of host pH by Colletotrichum species as a mechanism to increase virulence. Mol Plant Microbe Interact 2001, 14:1105–1113.PubMedCrossRef 7. Maldonado MC, Strasser de Saad AM, Callieri D: Catabolite repression of the synthesis of inducible polygalacturonase and pectinesterase by Aspergillus niger sp. Curr Microbiol 1989, 18:303–306.CrossRef 8.