STRUCTURAL GENOMICS, UNKNOWN FUNCTION, GTP-BINDING, GTPASE, OBG, BUNDLE, GDP, COMPLEX, NPPSFA, NATIONAL PROJECT ON PROTEIN STRUCTURAL AND FUNCTIONAL ANALYSES, RIKEN STRUCTURAL GENOMICS/PROTEOMICS INITIATIVE, RSGI CRYSTAL STRUCTURE OF HYPOTHETICAL GTP-BINDING PROTEIN PH1320 FROM PYROCOCCUS HORIKOSHII OT3, IN COMPLEX WITH GDP 2E87