The nucleolar protein SWM2 (Synthetic With MUD-2-delta protein2) constitutes a yeast protein family. SWM2 is a nonessential gene whose function is unknown, but it encodes a protein that binds Tgs1, an enzyme responsible for 2,2,7-trimethylguanosine (TMG) capping [1,2] of small nuclear (sn) RNAs implicated in pre-mRNA splicing [3].

1: A comprehensive analysis of protein-protein interactions in Saccharomyces cerevisiae. Uetz P, Giot L, Cagney G, Mansfield TA, Judson RS, Knight JR, Lockshon D, Narayan V, Srinivasan M, Pochart P, Qureshi-Emili A, Li Y, Godwin B, Conover D, Kalbfleisch T, Vijayadamodar G, Yang M, Johnston M, Fields S, Rothberg JM; Nature. 2000;403:623-627. PMID:10688190

2: High-quality binary protein interaction map of the yeast interactome network. Yu H, Braun P, Yildirim MA, Lemmens I, Venkatesan K, Sahalie J, Hirozane-Kishikawa T, Gebreab F, Li N, Simonis N, Hao T, Rual JF, Dricot A, Vazquez A, Murray RR, Simon C, Tardivo L, Tam S, Svrzikapa N, Fan C, de Smet AS, Motyl A, Hudson ME, Park J, Xin X, Cusick ME, Moore T, Boone C, Snyder M, Roth FP, Barabasi AL, Tavernier J, Hill DE, Vidal M; Science. 2008;322:104-110. PMID:18719252

3: Mutational analyses of trimethylguanosine synthase (Tgs1) and Mud2: proteins implicated in pre-mRNA splicing. Chang J, Schwer B, Shuman S; RNA. 2010;16:1018-1031. PMID:20360394