This antiserum binds to a chitinase at the conidial surface (Boldo et al., 2009), and 86.5% (1972±166.7) of the conidia adhered before RG7422 concentration washing while 106% (1712±177) adhered afterwards. When the wings were treated with the recombinant GAPDH, the adhesion decreased to 31% (697.7±132.4) and 11% (254.3±41.37) (P<0.0001) before and after washing, respectively. Again, to exclude unspecific blocking of the adhesion by the protein

wing treatment, we used BSA as a control. In this case, adhesion was 96% (2205±207.8) and 122% (1974±120.4) before and after washing, respectively (Fig. 6). In order to study the possible participation of GAPDH in adhesion to the host, we isolated and characterized the M. anisopliae GAPDH gene and protein. The deduced amino acid sequence from the cDNA and from the gene was confirmed by MS identification with the major native protein form (36 kDa, pI 7.0) isolated from 2-D gel electrophoresis of mycelial

M. anisopliae protein extract. The other two protein isoforms (36 kDa, pIs 6.6 and 6.8) recognized by immunodetection using the P. brasiliensis anti-GAPDH serum led us to infer GAPDH isoform identity. A multiple isoform pattern could suggest different functions for each isoform, as found in other systems (Barbosa et al., 2004; Benndorf et al., 2008). GAPDH in M. anisopliae revealed regulated transcription and translation patterns in response to different carbon see more sources. In Mucor circinelloides, the orthologous gpdh1 gene was also shown to have a well-defined transcription pattern that is primarily regulated in response to the

carbon source by a mechanism that includes a negative regulator (Larsen et al., 2004). The behavior of gpdh1 gene transcription in M. anisopliae in response to different carbon sources led us to infer that glycerol and ethanol are assimilated directly by the citric acid cycle pathway and the oxidative phosphorylation chain. Because of the lack of glucose in these experiments, the gpdh1 gene transcripts MRIP were strongly repressed. The patterns of gpdh1 transcripts confirm that aerobic metabolism prevails in M. anisopliae as would be expected if aerobic metabolism prevails in M. anisopliae as well as other filamentous fungi such as Trichoderma reesei (Chambergo et al., 2002). A well-known mechanism of carbon-catabolism gene tuning in response to the available substrate is the carbon catabolite repression that was observed in Aspergillus nidulans. When this fungus is grown on complex substrates containing both metabolically favorable carbon sources (such as glucose) and less favorable ones (such as ethanol and glycerol), it is able to repress the genes involved in the utilization of the less favorable carbon. An important regulatory protein controlling carbon repression in A. nidulans is CreA (Mogensen et al., 2006). In M. anisopliae, repression occurs by CRR1 (Screen et al., 1997), the CreA ortholog. A marked decrease in gpdh1 transcript accumulation in total RNA extracted from M.