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Published 17 July 2006. doi:10.1083/jcb.200604094
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 174, Number 2, 207-220
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Article

 Exit from mitosis triggers Chs2p transport from the endoplasmic reticulum to mother–daughter neck via the secretory pathway in budding yeast

Gang Zhang, Rohini Kashimshetty, Kwee Eng Ng, Heng Buck Tan, and Foong May Yeong

Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597

Correspondence to Foong May Yeong: bchyfm{at}nus.edu.sg

Budding yeast chitin synthase 2 (Chs2p), which lays down the primary septum, localizes to the mother–daughter neck in telophase. However, the mechanism underlying the timely neck localization of Chs2p is not known. Recently, it was found that a component of the exocyst complex, Sec3p–green fluorescent protein, arrives at the neck upon mitotic exit. It is not clear whether the neck localization of Chs2p, which is a cargo of the exocyst complex, was similarly regulated by mitotic exit. We report that Chs2p was restrained in the endoplasmic reticulum (ER) during metaphase. Furthermore, mitotic exit was sufficient to cause Chs2p neck localization specifically by triggering the Sec12p-dependent transport of Chs2p out of the ER. Chs2p was "forced" prematurely to the neck by mitotic kinase inactivation at metaphase, with chitin deposition occurring between mother and daughter cells. The dependence of Chs2p exit from the ER followed by its transport to the neck upon mitotic exit ensures that septum formation occurs only after the completion of mitotic events.

G. Zhang, R. Kashimshetty, and K.E. Ng contributed equally to this paper.

Abbreviations used in this paper: Gal, galactose; HU, hydroxyurea; MEN, mitotic exit network; Noc, nocodazole; Raff, raffinose; SPB, spindle pole body; YP, yeast extract peptone.


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