Role of Inn1 and its interactions with Hof1 and Cyk3 in promoting cleavage furrow and septum formation in S. cerevisiae.

Journal Article (Journal Article)

Cytokinesis requires coordination of actomyosin ring (AMR) contraction with rearrangements of the plasma membrane and extracellular matrix. In Saccharomyces cerevisiae, new membrane, the chitin synthase Chs2 (which forms the primary septum [PS]), and the protein Inn1 are all delivered to the division site upon mitotic exit even when the AMR is absent. Inn1 is essential for PS formation but not for Chs2 localization. The Inn1 C-terminal region is necessary for localization, and distinct PXXP motifs in this region mediate functionally important interactions with SH3 domains in the cytokinesis proteins Hof1 (an F-BAR protein) and Cyk3 (whose overexpression can restore PS formation in inn1Delta cells). The Inn1 N terminus resembles C2 domains but does not appear to bind phospholipids; nonetheless, when overexpressed or fused to Hof1, it can provide Inn1 function even in the absence of the AMR. Thus, Inn1 and Cyk3 appear to cooperate in activating Chs2 for PS formation, which allows coordination of AMR contraction with ingression of the cleavage furrow.

Full Text

Duke Authors

Cited Authors

  • Nishihama, R; Schreiter, JH; Onishi, M; Vallen, EA; Hanna, J; Moravcevic, K; Lippincott, MF; Han, H; Lemmon, MA; Pringle, JR; Bi, E

Published Date

  • June 2009

Published In

Volume / Issue

  • 185 / 6

Start / End Page

  • 995 - 1012

PubMed ID

  • 19528296

Pubmed Central ID

  • 19528296

Electronic International Standard Serial Number (EISSN)

  • 1540-8140

International Standard Serial Number (ISSN)

  • 0021-9525

Digital Object Identifier (DOI)

  • 10.1083/jcb.200903125

Language

  • eng