1N87: Solution structure of the U-box of Prp19

The structure of the U-box in the essential Saccharomyces cerevisiae pre-mRNA splicing factor Prp19p has been determined by NMR. The conserved zinc-binding sites supporting the cross-brace arrangement in RING-finger domains are replaced by hydrogen-bonding networks in the U-box. These hydrogen-bonding networks are necessary for the structural stabilization and activity of the U-box. A conservative Val-->Ile point mutation in the Prp19p U-box domain leads to pre-mRNA splicing defects in vivo. NMR analysis of this mutant shows that the substitution disrupts structural integrity of the U-box domain. Furthermore, comparison of the Prp19p U-box domain with known RING-E2 complex structures demonstrates that both U-box and RING-fingers contain a conserved interaction surface. Mutagenesis of residues at this interface, while not perturbing the structure of the U-box, abrogates Prp19p function in vivo. These comparative structural and functional analyses imply that the U-box and its associated ubiquitin ligase activity are critical for Prp19p function in vivo.
PDB ID: 1N87Download
MMDB ID: 25557
PDB Deposition Date: 2002/11/19
Updated in MMDB: 2003/12
Experimental Method:
solution nmr
Source Organism:
Similar Structures:
Molecular Components in 1N87
Label Count Molecule
Protein (1 molecule)
Pre-mrna Splicing Factor Prp19(Gene symbol: PRP19)
Molecule annotation
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