This entry represents the Plug domain from the Brr2 RNA helicase protein. The Brr2 helicase provides the key remodelling activity for spliceosome catalytic activation, during which it disrupts the U4/U6 di-snRNP (small nuclear RNA protein) [2]. The plug domain is a small alpha helical bundle domain found near the N-terminus of the Brr2 protein [2].

1: The 3.8 A structure of the U4/U6.U5 tri-snRNP: Insights into spliceosome assembly and catalysis. Wan R, Yan C, Bai R, Wang L, Huang M, Wong CC, Shi Y; Science. 2016;351:466-475. PMID:26743623

2: The large N-terminal region of the Brr2 RNA helicase guides productive spliceosome activation. Absmeier E, Wollenhaupt J, Mozaffari-Jovin S, Becke C, Lee CT, Preussner M, Heyd F, Urlaub H, Luhrmann R, Santos KF, Wahl MC; Genes Dev. 2015;29:2576-2587. PMID:26637280

3: Cryo-EM structure of the yeast U4/U6.U5 tri-snRNP at 3.7 A resolution. Nguyen THD, Galej WP, Bai XC, Oubridge C, Newman AJ, Scheres SHW, Nagai K; Nature. 2016;530:298-302. PMID:26829225