Analysis of the protein composition of the spindle pole body during sporulation in Ashbya gossypii


Autoři: Dario Wabner aff001;  Tom Overhageböck aff001;  Doris Nordmann aff001;  Julia Kronenberg aff001;  Florian Kramer aff001;  Hans-Peter Schmitz aff001
Působiště autorů: Department of Genetics, University of Osnabrück, Osnabrück, Germany aff001
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223374

Souhrn

The spores of fungi come in a wide variety of forms and sizes, highly adapted to the route of dispersal and to survival under specific environmental conditions. The ascomycete Ashbya gossypii produces needle shaped spores with a length of 30 μm and a diameter of 1 μm. Formation of these spores relies on actin and actin regulatory proteins and is, therefore, distinct from the minor role that actin plays for spore formation in Saccharomyces cerevisiae. Using in vivo FRET-measurements of proteins labeled with fluorescent proteins, we investigate how the formin AgBnr2, a protein that promotes actin polymerization, integrates into the structure of the spindle pole body during sporulation. We also investigate the role of the A. gossypii homologs to the S. cerevisiae meiotic outer plaque proteins Spo74, Mpc54 and Ady4 for sporulation in A. gossypii. We found highest FRET of AgBnr2 with AgSpo74. Further experiments indicated that AgSpo74 is a main factor for targeting AgBnr2 to the spindle pole body. In agreement with these results, the Agspo74 deletion mutant produces no detectable spores, whereas deletion of Agmpc54 only has an effect on spore length and deletion of Agady4 has no detectable sporulation phenotype. Based on this study and in relation to previous results we suggest a model where AgBnr2 resides within an analogous structure to the meiotic outer plaque of S. cerevisiae. There it promotes formation of actin cables important for shaping the needle shaped spore structure.

Klíčová slova:

Actins – Fluorescence resonance energy transfer – Fungal spores – Fungal sporulation – Fungal structure – Protein interactions – Saccharomyces cerevisiae – Mycelium


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PLOS One


2019 Číslo 10

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