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American Society for Cell Biology, Molecular Biology of the Cell, 4(19), p. 1439-1449

DOI: 10.1091/mbc.e07-05-0464

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The Tip Growth Apparatus ofAspergillus nidulans

Journal article published in 2008 by Naimeh Taheri-Talesh, Tetsuya Horio, Lidia Araujo-Bazán ORCID, Xiaowei Dou, Eduardo A. Espeso, Miguel A. Peñalva, Stephen A. Osmani, Berl R. Oakley
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Hyphal tip growth in fungi is important because of the economic and medical importance of fungi, and because it may be a useful model for polarized growth in other organisms. We have investigated the central questions of the roles of cytoskeletal elements and of the precise sites of exocytosis and endocytosis at the growing hyphal tip by using the model fungus Aspergillus nidulans. Time-lapse imaging of fluorescent fusion proteins reveals a remarkably dynamic, but highly structured, tip growth apparatus. Live imaging of SYNA, a synaptobrevin homologue, and SECC, an exocyst component, reveals that vesicles accumulate in the Spitzenkörper (apical body) and fuse with the plasma membrane at the extreme apex of the hypha. SYNA is recycled from the plasma membrane by endocytosis at a collar of endocytic patches, 1-2 mum behind the apex of the hypha, that moves forward as the tip grows. Exocytosis and endocytosis are thus spatially coupled. Inhibitor studies, in combination with observations of fluorescent fusion proteins, reveal that actin functions in exocytosis and endocytosis at the tip and in holding the tip growth apparatus together. Microtubules are important for delivering vesicles to the tip area and for holding the tip growth apparatus in position.