title: The alpha and beta of turning on a molecular switch.
abstract: The crystal structures of RCC1 and the Sec7 domain of human Arno, nucleotide exchange factors for the Ras-related GTPases Ran and ARF, reveal two very different folds, the former a seven-bladed beta-propeller, the latter a capped right-handed superhelix. Both are also unrelated to the folds of Mss4 and elongation factor Ts, nucleotide exchange factors for Rab and elongation factor Tu.
authors.forename: E F
authors.initials: EF
authors.lastname: Pai
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins / Q000737:chemistry; D005656:Fungal Proteins / Q000737:chemistry; D019204:GTP-Binding Proteins / Q000737:chemistry* / Q000378:metabolism*; D020690:GTPase-Activating Proteins; D020662:Guanine Nucleotide Exchange Factors; D006801:Humans; D008958:Models, Molecular; D009687:Nuclear Proteins; D017510:Protein Folding; D017433:Protein Structure, Secondary
chemical_list: D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D020690:GTPase-Activating Proteins; D020662:Guanine Nucleotide Exchange Factors; D009687:Nuclear Proteins; C062521:RCC1 protein, human; C066755:Sec7 guanine nucleotide exchange factors; C102474:cytohesin-2; D019204:GTP-Binding Proteins