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. 2011 Mar 25;23(3):1033–1046. doi: 10.1105/tpc.111.083980

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© 2011 American Society of Plant Biologists

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Figure 9. — A Model for the Dual Roles of APC/C in Regulating Cyclin B1;1 during Male Gametophyte Development.

APC/C not only degrades CYCB1;1 directly but also directly or indirectly regulates miR159 transcription by recruiting Pol II to promoter regions. The positive regulation of miR159 by APC/C causes the correspondingly negative regulation of a miR159 target, DUO1, which ultimately leads to reduced CYCB1;1 expression. The dual role of APC/C in CYCB1;1 function ensures proper progression of the two mitoses. VN, vegetative nucleus; SC, sperm cells.