The crystal structure of rna1p: a new fold for a GTPase-activating protein.Hillig, R.C., Renault, L., Vetter, I.R., Drell 4th, T., Wittinghofer, A., Becker, J.
(1999) Mol Cell 3: 781-791
- PubMed: 10394366
- DOI: 10.1016/s1097-2765(01)80010-1
- Structures With Same Primary Citation
- PubMed Abstract:
- RNA1 encodes a GTPase-activating protein specific for Gsp1p, the Ran/TC4 homologue of Saccharomyces cerevisiae.
Becker, J., Melchior, F., Gerke, V., Bischoff, F.R., Ponstingl, H., Wittinghofer, A.
(1995) J Biol Chem 270: 11860
- A functional homologue of the RNA1 gene product in Schizosaccharomyces pombe: purification, biochemical characterization, and identification of a leucine-rich repeat motif.
Melchior, F., Weber, K., Gerke, V.
(1993) Mol Biol Cell 4: 569
rna1p is the Schizosaccharomyces pombe ortholog of the mammalian GTPase-activating protein (GAP) of Ran. Both proteins are essential for nuclear transport. Here, we report the crystal structure of rna1p at 2.66 A resolution. It contains 11 leucine-ri ...
rna1p is the Schizosaccharomyces pombe ortholog of the mammalian GTPase-activating protein (GAP) of Ran. Both proteins are essential for nuclear transport. Here, we report the crystal structure of rna1p at 2.66 A resolution. It contains 11 leucine-rich repeats that adopt the nonglobular shape of a crescent, bearing no resemblance to RhoGAP or RasGAP. The invariant residues of RanGAP form a contiguous surface, strongly indicating the Ran-binding interface. Alanine mutations identify Arg-74 as a critical residue for GTP hydrolysis. In contrast to RasGAP and RhoGAP, Arg-74 could be substituted by lysine and contributed significantly to the binding of Ran. Therefore, we suggest a GAP mechanism for rna1p, which constitutes a variation of the arginine finger mechanism found for Ras GAP and RhoGAP.
Max-Planck-Institut für molekulare Physiologie, Abteilung Strukturelle Biologie, Dortmund, Germany.