Functions of PUF Family RNA-Binding Proteins in .

RNA-binding proteins are involved in RNA metabolism and posttranscriptional regulation of various fundamental biological processes. The PUF family of RNA-binding proteins is highly conserved in eukaryotes, and its members regulate gene expression, mitochondrial biogenesis, and RNA processing. However, their biological functions in species remain mostly unknown in filamentous fungi. Here we have characterized the puf genes in the model organism . We generated deletion mutant strains for the five putative puf genes present in the genome and investigated their developmental phenotypes. Deletion of or affected fungal growth and asexual development. mutants exhibited decreased production of asexual spores and reduced mRNA expression of genes regulating asexual development. The deletion reduced colony growth, increased formation of asexual spores, and delayed production of sexual fruiting bodies. In addition, the absence of reduced both sterigmatocystin production and the mRNA levels of genes in the sterigmatocystin cluster. Finally, deletion mutants showed reduced trehalose production and lower resistance to thermal stress. Overall, these results demonstrate that PufA and PufE play roles in the development and sterigmatocystin metabolism in .