74e-12   Organic acid metabolic process 1.63e-08 Amine metabolic process   1.47e-13   Gamma-aminobutyric acid metabolic process 0.00078 GO term assignment for C. neoformans H99 genes was based on homology to S. cerevisiae genes. P-value represents the probability that a particular GO term is enriched in the microarray gene list. The P-value cut-off was < 0.05. Effect of FLC on genes involved in ergosterol biosynthesis and related pathways Earlier efforts to profile the response of yeast cells (S. cerevisiae or C. albicans) to the short-term exposure to azole drugs implicated

genes in the ergosterol biosynthetic pathway as major players [28, 29], thus indicating that this pathway is the target of azoles and is responsive to modulations in ergosterol levels. As shown in Table 1, we found that eight ERG genes (ERG1, ERG2, ERG3, ERG5, ERG7, https://www.selleckchem.com/products/tpx-0005.html ERG11, ERG13 and ERG25) exhibited increases in expression Tideglusib order (2.09- to 3.95-fold) upon FLC treatment. This was a predictable result from the inhibition of Erg11 function by FLC, which is the rate-limiting step of the ergosterol biosynthetic pathway. Indeed, the idea of a compensatory response to re-establish the plasma

membrane ergosterol levels [30] may account for the observed upregulation of either early (ERG13, ERG7 and ERG1) or late (ERG25, ERG2, ERG3 and ERG5) genes of the ergosterol pathway, in addition to upregulation of ERG11 itself (Table 1, ergosterol biosynthesis). ERG13 encodes the enzyme hydroxymethylglutaryl-CoA synthase that catalyzes the production of hydroxymethylglutaryl-CoA from acetyl-CoA and acetoacetyl-CoA, and acts in the Dapagliflozin mevalonate biosynthesis, a precursor required for the biosynthesis of ergosterol. Acetyl-CoA is converted to carbon dioxide and water by enzymes (e.g. isocitrate dehydrogenase) that function in the TCA cycle, a central metabolic process in the mitochondria leading to produce, after oxidative www.selleckchem.com/products/PLX-4720.html phosphorylation, chemical energy in the form of ATP and NADH. Presumably, as a result of feedback control, we observed that several TCA cycle

enzymes were downregulated in response to FLC (Table 1, TCA cycle), suggesting that C. neoformans may direct the cellular acetyl-CoA content to lipid (sterol) biosynthesis and metabolism to counterbalance ergosterol alteration. Our particular interest was the up-regulation (4.04-fold) of SRE1, that belongs to a group of sterol regulatory element-binding proteins (SREBPs), first characterized in mammalian cells as regulator of lipid homeostasis [34]. While C. neoformans Sre1 regulates genes encoding ergosterol biosynthetic enzymes, SRE1 was shown to be required for growth and survival in the presence of azoles and also for virulence in a mouse model of cryptococcosis [18, 20, 35]. In addition, C. neoformans Sre1 stimulates ergosterol production in response to sterol depletion when the oxygen-dependent ergosterol synthesis is limited by hypoxia [36]. Consistently, C.