Effect of substrates on the malonate inhibitory pattern and brefeldin A formation in Curvularia lunata.

The extracellular level of brefeldin A fluctuates with the length of malonate inhibition. Following treatment with malonate, mycelial multiplication as opposed to brefeldin A formation, was preferentially increased in the maleate, fumarate, succinate, citrate, methyl palmitate and glucose replacement cultures. Competitive maleate--malonate, fumarate--malonate, succinate--malonate and citrate--malonate-inhibited replacement cultures gave significantly higher mycelial and brefeldin A yields than the sole malonate-inhibited replacement cultures.