The Anaphase-promoting complex/cyclosome (APC/C) is a 1.5 megaDaltons assembly ubiquitin ligase complex comprising 19 subunits. This multifunctional ubiquitin-protein ligase targets different substrates for ubiquitylation and therefore regulates a variety of cellular processes such as cell division, differentiation, genome stability, energy metabolism, cell death, autophagy as well as carcinogenesis [1]. The APC/C complex contains two sub-complexes,the Platform and the Arc Lamp. The Arc Lamp, which mediates transient association with regulators and ubiquitination substrates, contains the small subunits APC16, CDC26, APC13, and tetratricopeptide repeat (TPR) proteins [2]. APC16 is a conserved subunit of the APC/C. APC16 was found in association with tandem-affinity-purified mitotic checkpoint complex protein complexes. APC16 is a bona fide subunit of human APC/C. It is present in APC/C complexes throughout the cell cycle. The phenotype of APC16-depleted cells copies depletion of other APC/C subunits, and APC16 is important for APC/C activity towards mitotic substrates. APC16 sequence homologues can be identified in metazoans, but not fungi, by four conserved primary sequence stretches [3].

1: Insights into APC/C: from cellular function to diseases and therapeutics. Zhou Z, He M, Shah AA, Wan Y; Cell Div. 2016;11:9. PMID:27418942

2: Structure of an APC3-APC16 complex: insights into assembly of the anaphase-promoting complex/cyclosome. Yamaguchi M, Yu S, Qiao R, Weissmann F, Miller DJ, VanderLinden R, Brown NG, Frye JJ, Peters JM, Schulman BA; J Mol Biol. 2015;427:1748-1764. PMID:25490258

3: APC16 is a conserved subunit of the anaphase-promoting complex/cyclosome. Kops GJ, van der Voet M, Manak MS, van Osch MH, Naini SM, Brear A, McLeod IX, Hentschel DM, Yates JR 3rd, van den Heuvel S, Shah JV; J Cell Sci. 2010;123:1623-1633. PMID:20392738