Abstract: Aspergillus terreus is an industrially important filamentous fungus producing a wide spectrum of secondary metabolites, including lovastatin and itaconic acid. It also produces butyrolactone I which has shown potential as an antitumour agent. Additionally, butyrolactone I has been implicated to have a regulating role in the secondary metabolism and morphology of A. terreus. In this study, a quantitative time-course liquid chromatography—electrospray ionisation—tandem mass spectrometry (LC-ESI-MS-MS) analysis of butyrolactone I is reported for the first time in nine-day long submerged cultures of A. terreus. Butyrolactone I was fragmented in the mass analysis producing a reproducible fragmentation pattern of four main daughter ions (m/z 307, 331, 363 and 393) in all the samples tested. Supplementing the cultures with 100 nM butyrolactone I caused a statistically significant increase (up to two-fold) in its production, regardless of the growth stage but was constitutive when butyrolactone I was added at high cell density during the stationary phase. Furthermore, the extracellular butyrolactone I concentration peaked at 48 h post inoculation, showing a similar profile as has been reported for bacterial quorum sensing molecules. Taken together, the results support the idea of butyrolactone I as a quorum sensing molecule in A. terreus.
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Palonen, E.K.; Neffling, M.-R.; Raina, S.; Brandt, A.; Keshavarz, T.; Meriluoto, J.; Soini, J. Butyrolactone I Quantification from Lovastatin Producing Aspergillus terreus Using Tandem Mass Spectrometry—Evidence of Signalling Functions. Microorganisms 2014, 2, 111-127.
Palonen EK, Neffling M-R, Raina S, Brandt A, Keshavarz T, Meriluoto J, Soini J. Butyrolactone I Quantification from Lovastatin Producing Aspergillus terreus Using Tandem Mass Spectrometry—Evidence of Signalling Functions. Microorganisms. 2014; 2(2):111-127.
Palonen, Elina K.; Neffling, Milla-Riina; Raina, Sheetal; Brandt, Annika; Keshavarz, Tajalli; Meriluoto, Jussi; Soini, Juhani. 2014. "Butyrolactone I Quantification from Lovastatin Producing Aspergillus terreus Using Tandem Mass Spectrometry—Evidence of Signalling Functions." Microorganisms 2, no. 2: 111-127.