Download MendeleyCrystal structure of the C-terminal domain of splicing factor Prp8 carrying retinitis pigmentosa mutants
Zhang, L., Shen, J., Guarnieri, M.T., Heroux, A., Yang, K., Zhao, R.(2007) Protein Sci 16: 1024-1031
- PubMed: 17473007
- DOI: https://doi.org/10.1110/ps.072872007
- Primary Citation of Related Structures:
2P87, 2P8R - PubMed Abstract:
Prp8 is a critical pre-mRNA splicing factor. Prp8 is proposed to help form and stabilize the spliceosome catalytic core and to be an important regulator of spliceosome activation. Mutations in human Prp8 (hPrp8) cause a severe form of the genetic disorder retinitis pigmentosa, RP13. Understanding the molecular mechanism of Prp8's function in pre-mRNA splicing and RP13 has been hindered by its large size (over 2000 amino acids) and remarkably low-sequence similarity with other proteins. Here we present the crystal structure of the C-terminal domain (the last 273 residues) of Caenorhabditis elegans Prp8 (cPrp8). The core of the C-terminal domain is an alpha/beta structure that forms the MPN (Mpr1, Pad1 N-terminal) fold but without Zn(2+) coordination. We propose that the C-terminal domain is a protein interaction domain instead of a Zn(2+)-dependent metalloenzyme as proposed for some MPN proteins. Mapping of RP13 mutants on the Prp8 structure suggests that these residues constitute a binding surface between Prp8 and other partner(s), and the disruption of this interaction provides a plausible molecular mechanism for RP13.
Organizational Affiliation:
Department of Biochemistry and Molecular Genetics, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado 80045, USA.
