1YRG THE CRYSTAL STRUCTURE OF RNA1P: A NEW FOLD FOR A GTPASE- ACTIVATING PROTEIN TRANSCRIPTION, GTPASE-ACTIVATING PROTEIN, GAP, RNA1P, RANGAP, LRR, LEUCINE- RICH REPEAT PROTEIN, TWINNING, HEMIHEDRAL TWINNING, MEROHEDRAL TWINNING, MEROHEDRY