This family includes the SWIB domain and the MDM2 domain [1]. The p53-associated protein (MDM2) is an inhibitor of the p53 tumour suppressor gene binding the transactivation domain and down regulating the ability of p53 to activate transcription. This family contains the p53 binding domain of MDM2 [2].

1: The SWIB and the MDM2 domains are homologous and share a common fold. Bennett-Lovsey R, Hart SE, Shirai H, Mizuguchi K; Bioinformatics 2002;18:626-630. PMID:12016060

2: Structure of the MDM2 oncoprotein bound to the p53 tumor suppressor transactivation domain. Kussie PH, Gorina S, Marechal V, Elenbaas B, Moreau J, Levine AJ, Pavletich NP; Science. 1996;274:948-953. PMID:8875929