Function
Negative regulator of the anaphase-promoting complex/cyclosome (APC/C) ubiquitin ligase required for proper mitotic and meiotic progression and cell fate determination. Involved in entry into both meiosis I and meiosis II. Prevents endomitosis by preferentially inhibiting APC/C(CDC20). Required for megagametophyte and endosperm development. Triggers mitotic cyclins (e.g. CYCB1-1 and CYCB1-2) accumulation. Confers immunity to bacterial pathogens (e.g. Pseudomonas syringae pv. tomato DC3000), which is associated with increased expression of disease resistance (R) genes. GIG1 and PANS1 are part of a network linking centromere cohesion and cell cycle progression through control of APC/C activity.