Press Release 011/2018

How Fungi Grow: A Movie from Inside the Cell

With the Help of High-performance Light Microscopy, KIT Scientists Succeeded in Observing the Growth of Fungi in Living Cells
Growth of fungi (left) on the molecular level (right) is in the focus of research conducted by KIT scientists. (Photo: L. Zhou, KIT)
Growth of fungi (left) on the molecular level (right) is in the focus of research conducted by KIT scientists. (Photo: L. Zhou, KIT)

Fungi forming mold on food are hazardous. Fungi supplying antibiotics are beneficial. Fungi may be harmful pathogens. On the other hand, they are used for the production of food or medicine and in bioengineering. In either case, it is required to precisely understand their growth mechanism. Researchers of Karlsruhe Institute of Technology (KIT) have made a big step forwards: Using high-performance light microscopy, they watched mold fungi as they grew in the cell. The findings are presented in Science Advances. 


Like most fungi, mold fungi are hyphal fungi. They consist of filamentous cells, hyphae, which may form large networks, mycelia. The hyphae of about 3 µm in thickness exclusively grow by directed extension of their tips. They grow very rapidly, by about 1.5 mm per day. An important objective of biological fundamental research is to understand this growth on the molecular level, as hyphal growth plays an important role in both health-damaging effects and beneficial applications of fungi.


For their studies, the researchers tagged a key enzyme required for building the chitin-containing cell wall with a fluorescent protein and observed the latter in the living cell with the help of high-resolution microscopy (nanoscopy). Use of ultrasensitive cameras in the microscope enabled high-speed imaging of tip growth and of the transport of individual vesicles. These images resemble small movies and allow to precisely determine transport speed of the vesicles. They reveal how building materials are packed into smallest vesicles and transported along the fiber structures of the cell skeleton to the cell tip by transport vehicles, the motor proteins. Motor proteins are very small nanomotors that dock to the fiber structures with two small “feet” and walk on these structures. Using genetically modified fungi, the scientists also identified the motor proteins responsible for the transports.


From their observations, the researchers of the Institute of Applied Physics and the Institute for Applied Biosciences of KIT derived a first comprehensive model to describe how the rapidly growing hyphal tip is supplied with construction material. This is an important step towards complete molecular understanding of directed cell growth processes, Professor Gerd Ulrich Nienhaus of KIT’s Institute of Applied Physics says. “The findings made in hyphal fungi are of general relevance to biology, as they can be transferred to other cells and organisms. On the other hand, they open up new opportunities to specifically influence fungal growth, which is important to the mitigation of pathogenic species in medicine.”


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 Original publication in Science Advances:

Superresolution and pulse-chase imaging reveal the role of vesicle transport in polar growth of fungal cells; Lu Zhou, Minoas Evangelinos, Valentin Wernet, Antonia F. Eckert, Yuji Ishitsuka, Reinhard Fischer, G. Ulrich Nienhaus and Norio Takeshita.


Being “The Research University in the Helmholtz Association”, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility, and information. For this, about 10,000 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 22,800 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life. KIT is one of the German universities of excellence.

rl, 12.02.2018

Margarete Lehné
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