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Originally published as MBC in Press, 10.1091/mbc.01-06-0312 on December 7, 2001
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Vol. 13, Issue 1, 110-118, January 2002

Aspergillus nidulans Septin AspB Plays Pre- and Postmitotic Roles in Septum, Branch, and Conidiophore Development

Patrick J. Westfall, and Michelle Momany*

Department of Botany, University of Georgia, Athens, Georgia 30602

Members of the septin family of proteins act as organizational scaffolds in areas of cell division and new growth in a variety of organisms. Herein, we show that in the filamentous fungus Aspergillus nidulans, the septin AspB is important for cellular division, branching, and conidiation both pre- and postmitotically. AspB localizes postmitotically to the septation site with an underlying polarity that is evident as cytokinesis progresses. This localization at the septation site is dependent on actin and occurs before the cross-wall is visible. AspB localizes premitotically as a ring at sites of branching and secondary germ tube emergence. It is the only known branch site marker. In addition, AspB is found at several stages during the development of the asexual reproductive structure, the conidiophore. It localizes transiently to the vesicle/metula and metula/phialide interfaces, and persistently to the phialide/conidiospore interface. A temperature-sensitive mutant of AspB shows phenotypic abnormalities, including irregular septa, high numbers of branches, and immature asexual reproductive structures.

* Corresponding author. E-mail address: momany{at}botany.uga.edu.

Molecular Biology of the Cell
Vol. 13, 110-118, January 2002
Copyright © 2002 by The American Society for Cell Biology


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