This entry represents the N-terminal domain of SWI/SNF and RSC complexes subunit Ssr4 from S. pombe, a essential member of the chromatin structure remodelling complex (RSC) and the SWI/SNF complex [1,2]. The structure of this domain revealed that it has a novel fold comprising an antiparallel beta-sheet of seven strands with alpha-helices on one side and random coil on the other [2]. It contains the highly conserved motif WxxxxxPxxGxxxxxxxxxxxxxxxDG. RSC is involved in transcription regulation and nucleosome positioning which controls, particularly, membrane and organelle development genes. The ATP-dependent chromatin remodelling complex SWI/SNF is required for the positive and negative regulation of gene expression of a large number of genes through the regulation of nucleosome remodelling [1].

1: Fission yeast SWI/SNF and RSC complexes show compositional and functional differences from budding yeast. Monahan BJ, Villen J, Marguerat S, Bahler J, Gygi SP, Winston F; Nat Struct Mol Biol. 2008;15:873-880. PMID:18622392

2: The X-ray crystal structure of the N-terminal domain of Ssr4, a Schizosaccharomyces pombe chromatin-remodelling protein. Newman J, Nebl T, Van H, Peat TS; Acta Crystallogr F Struct Biol Commun. 2020;76:583-589. PMID:33263569