Crystal structure of U2 snRNP SF3b components: Hsh49p in complex with Cus1p-binding domain
Résumé
Spliceosomal proteins Hsh49p and Cus1p are components of SF3b, which together with SF3a, Msl1p/Lea1p, Sm proteins, and U2 snRNA, form U2 snRNP, which plays a crucial role in pre-mRNA splicing. Hsh49p, comprising two RRMs, forms a heterodimer with Cus1p. We determined the crystal structures of Saccharomyces cerevisiae full-length Hsh49p as well as its RRM1 in complex with a minimal binding region of Cus1p (residues 290-368). The structures show that the Cus1 fragment binds to the alpha-helical surface of Hsh49p RRM1, opposite the four-stranded beta-sheet, leaving the canonical RNA-binding surface available to bind RNA. Hsh49p binds the 5' end region of U2 snRNA via RRM1. Its affinity is increased in complex with Cus1(290-368)p, partly because an extended RNA-binding surface forms across the protein-protein interface. The Hsh49p RRM1-Cus1(290-368)p structure fits well into cryo-EM density of the Bact spliceosome, corroborating the biological relevance of our crystal structure.
Mots clés
Amino Acid Sequence
Binding Sites
Conserved Sequence
*Models
Molecular
Multiprotein Complexes/metabolism
Proline-Rich Protein Domains
Protein Binding
*Protein Conformation
Protein Interaction Domains and Motifs
RNA/chemistry/genetics/metabolism
RNA
Small Nuclear/chemistry/genetics/metabolism
RNA-Binding Proteins/chemistry/metabolism
Ribonucleoprotein
U2 Small Nuclear/*chemistry/metabolism
RNA binding
Rrm
SF3b
U2 snRNP
splicing