Component of the anaphase promoting complex/cyclosome (APC/C), a cell cycle-regulated E3 ubiquitin-protein ligase complex that controls progression through mitosis and the G1 phase of the cell cycle. The APC/C complex controls several key steps in the cell cycle by mediating ubiquitination and subsequent degradation of target proteins such as cyclins. The APC/C complex is required for the female gametophyte development and is involved in several aspect of development by controlling cell division and cell elongation. Involved in the control of endoreduplication. Functionally redundant with CDC27A in the control of gametophyte development. Protein modification; protein ubiquitination. The APC/C is composed of at least 10 subunits (By similarity). Can homodimerize (By similarity). Interacts with APC2, APC10, FZR2 and FZR3 (PubMed:17944809). Interacts with PANS1 (PubMed:24206843). Interacts with SAMBA (PubMed:22869741). Specifically expressed in dividing and elongating cells. Dwarf plant with small leaves and stunted growth. Defect in cell division and expansion. Defective endoreduplication. Cdc27a and cdc27b double mutant is gametophytic lethal (PubMed:17944809). Belongs to the APC3/CDC27 family. Intron retention. Intron retention.