PMID- 10078529 OWN - NLM STAT- MEDLINE DCOM- 19990325 LR - 20061115 IS - 0028-0836 (Print) IS - 0028-0836 (Linking) VI - 398 IP - 6722 DP - 1999 Mar 4 TI - Structure of a Ran-binding domain complexed with Ran bound to a GTP analogue: implications for nuclear transport. PG - 39-46 AB - The protein Ran is a small GTP-binding protein that binds to two types of effector inside the cell: Ran-binding proteins, which have a role in terminating export processes from the nucleus to the cytoplasm, and importin-beta-like molecules that bind cargo proteins during nuclear transport. The Ran-binding domain is a conserved sequence motif found in several proteins that participate in these transport processes. The Ran-binding protein RanBP2 contains four of these domains and constitutes a large part of the cytoplasmic fibrils that extend from the nuclear-pore complex. The structure of Ran bound to a non-hydrolysable GTP analogue (Ran x GppNHp) in complex with the first Ran-binding domain (RanBD1) of human RanBP2 reveals not only that RanBD1 has a pleckstrin-homology domain fold, but also that the switch-I region of Ran x GppNHp resembles the canonical Ras GppNHp structure and that the carboxy terminus of Ran is wrapped around RanBD1, contacting a basic patch on RanBD1 through its acidic end. This molecular 'embrace' enables RanBDs to sequester the Ran carboxy terminus, triggering the dissociation of Ran x GTP from importin-beta-related transport factors and facilitating GTP hydrolysis by the GTPase-activating protein ranGAP. Such a mechanism represents a new type of switch mechanism and regulatory protein-protein interaction for a Ras-related protein. FAU - Vetter, I R AU - Vetter IR AD - Abteilung Strukturelle Biologie, Max-Planck-Institut fur molekulare Physiologie, Dortmund, Germany. FAU - Nowak, C AU - Nowak C FAU - Nishimoto, T AU - Nishimoto T FAU - Kuhlmann, J AU - Kuhlmann J FAU - Wittinghofer, A AU - Wittinghofer A LA - eng SI - PDB/1RRP PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Nature JT - Nature JID - 0410462 RN - 0 (Blood Proteins) RN - 0 (DNA-Binding Proteins) RN - 0 (Molecular Chaperones) RN - 0 (Nuclear Pore Complex Proteins) RN - 0 (Nuclear Proteins) RN - 0 (Phosphoproteins) RN - 0 (Recombinant Fusion Proteins) RN - 0 (platelet protein P47) RN - 0 (ran-binding protein 2) RN - 21820-51-9 (Phosphotyrosine) RN - 34273-04-6 (Guanylyl Imidodiphosphate) RN - EC 3.6.1.- (GTP-Binding Proteins) RN - EC 3.6.5.2 (ran GTP-Binding Protein) SB - IM MH - Amino Acid Sequence MH - Binding Sites MH - Biological Transport MH - Blood Proteins/chemistry MH - Cell Nucleus/*metabolism MH - Conserved Sequence MH - Crystallography, X-Ray MH - Cytoplasm/metabolism MH - DNA-Binding Proteins/chemistry/*metabolism MH - Escherichia coli MH - GTP-Binding Proteins/chemistry/*metabolism MH - Guanylyl Imidodiphosphate/chemistry/*metabolism MH - Humans MH - Models, Molecular MH - Molecular Chaperones MH - Molecular Sequence Data MH - *Nuclear Pore Complex Proteins MH - Nuclear Proteins/chemistry/*metabolism MH - *Phosphoproteins MH - Phosphotyrosine/metabolism MH - Protein Binding MH - Protein Conformation MH - Recombinant Fusion Proteins/chemistry/genetics/metabolism MH - Sequence Homology, Amino Acid MH - ran GTP-Binding Protein EDAT- 1999/03/17 03:05 MHDA- 2001/03/23 10:01 CRDT- 1999/03/17 03:05 PHST- 1999/03/17 03:05 [pubmed] PHST- 2001/03/23 10:01 [medline] PHST- 1999/03/17 03:05 [entrez] AID - 10.1038/17969 [doi] PST - ppublish SO - Nature. 1999 Mar 4;398(6722):39-46. doi: 10.1038/17969.