Abstract
Laccase production and pellet formation of transformants of Coprinopsis cinerea strain FA2222 of C. cinerea laccase gene lcc1 subcloned behind the gpdII-promoter from Agaricus bisporus were compared with a control transformant carrying no extra laccase gene. At the optimum growth temperature of 37 °C, maximal laccase yields of 2.9 U/ml were obtained by the best lcc1 transformant pYSK7-26 in liquid shake flask cultures. Reduction in temperature to 25 °C increased laccase yields up to 9.2 U/ml. The control transformant had no laccase activities at 37 °C but native activity at 25 °C (3.5 U/ml). Changing the temperature had severe effects on the morphology of the mycelial pellets formed during cultivation, but links of distinct pellet morphologies to native or recombinant laccase production could not be established. Automated image analysis was used to characterise pellet formation and morphological parameters (pellet area, diameter, convexity and mycelial structure). Cross sections of selected pellets showed that they differentiated in an outer rind and an inner medulla of loosened hyphae. Pellets at 25 °C had a small and dense outer zone and adopted with time a smooth surface. Pellets at 37 °C had a broader outer zone and a fringy surface due to generation of more and larger protuberances in the rind that when released can serve for production of further pellets.
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Acknowledgements
We thank Zemin Fang for sharing his unpublished results with us and Gisbert Langer for his excellent technical support in measuring the C/N ratio of the culture supernatants. Work on recombinant laccase production in C. cinerea was supported within the framework of a Common Lower Saxony-Israel-Project (ZN 2043) by the Ministry of Science and Culture of Lower Saxony.
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M. Rühl and U. Kües declare that they have no conflict of interest. K. Lange approved a firstly reviewed manuscript and agreed to submission but died prior to a resubmission of the manuscript upon improvements made based on appreciated good reviewer comments. The paper is dedicated to her memory.
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Karin Lange is deceased.
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Rühl, M., Lange, K. & Kües, U. Laccase production and pellet morphology of Coprinopsis cinerea transformants in liquid shake flask cultures. Appl Microbiol Biotechnol 102, 7849–7863 (2018). https://doi.org/10.1007/s00253-018-9227-7
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DOI: https://doi.org/10.1007/s00253-018-9227-7