Download MendeleyThe crystal structure of the nitrogen regulation fragment of the yeast prion protein Ure2p.
Umland, T.C., Taylor, K.L., Rhee, S., Wickner, R.B., Davies, D.R.(2001) Proc Natl Acad Sci U S A 98: 1459-1464
- PubMed: 11171973
- DOI: https://doi.org/10.1073/pnas.98.4.1459
- Primary Citation of Related Structures:
1HQO - PubMed Abstract:
The yeast nonchromosomal gene [URE3] is due to a prion form of the nitrogen regulatory protein Ure2p. It is a negative regulator of nitrogen catabolism and acts by inhibiting the transcription factor Gln3p. Ure2p residues 1--80 are necessary for prion generation and propagation. The C-terminal fragment retains nitrogen regulatory activity, albeit somewhat less efficiently than the full-length protein, and it also lowers the frequency of prion generation. The crystal structure of this C-terminal fragment, Ure2p(97--354), at 2.3 A resolution is described here. It adopts the same fold as the glutathione S-transferase superfamily, consistent with their sequence similarity. However, Ure2p(97--354) lacks a properly positioned catalytic residue that is required for S-transferase activity. Residues within this regulatory fragment that have been indicated by mutational studies to influence prion generation have been mapped onto the three-dimensional structure, and possible implications for prion activity are discussed.
Organizational Affiliation:
Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0560, USA.
