2bku

From Proteopedia

(Difference between revisions)

Current revision

Kap95p:RanGTP complex

Structural highlights

2bku is a 4 chain structure with sequence from Canis lupus familiaris and Saccharomyces cerevisiae. The January 2007 RCSB PDB Molecule of the Month feature on Importins by David S. Goodsell is 10.2210/rcsb_pdb/mom_2007_1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.7Å
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RAN_CANLF GTPase involved in nucleocytoplasmic transport, participating both to the import and the export from the nucleus of proteins and RNAs. Switches between a cytoplasmic GDP- and a nuclear GTP-bound state by nucleotide exchange and GTP hydrolysis. Nuclear import receptors such as importin beta bind their substrates only in the absence of GTP-bound RAN and release them upon direct interaction with GTP-bound RAN, while export receptors behave in the opposite way. Thereby, RAN controls cargo loading and release by transport receptors in the proper compartment and ensures the directionality of the transport. Interaction with RANBP1 induces a conformation change in the complex formed by XPO1 and RAN that triggers the release of the nuclear export signal of cargo proteins. RAN (GTP-bound form) triggers microtubule assembly at mitotic chromosomes and is required for normal mitotic spindle assembly and chromosome segregation. Required for normal progress through mitosis. The complex with BIRC5/survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2. Enhances AR-mediated transactivation.[UniProtKB:P62826]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Nuclear protein import is mediated mainly by the transport factor importin-beta that binds cytoplasmic cargo, most often via the importin-alpha adaptor, and then transports it through nuclear pore complexes. This active transport is driven by disassembly of the import complex by nuclear RanGTP. The switch I and II loops of Ran change conformation with nucleotide state, and regulate its interactions with nuclear trafficking components. Importin-beta consists of 19 HEAT repeats that are based on a pair of antiparallel alpha-helices (referred to as the A- and B-helices). The HEAT repeats stack to yield two C-shaped arches, linked together to form a helicoidal molecule that has considerable conformational flexibility. Here we present the structure of full-length yeast importin-beta (Kap95p or karyopherin-beta) complexed with RanGTP, which provides a basis for understanding the crucial cargo-release step of nuclear import. We identify a key interaction site where the RanGTP switch I loop binds to the carboxy-terminal arch of Kap95p. This interaction produces a change in helicoidal pitch that locks Kap95p in a conformation that cannot bind importin-alpha or cargo. We suggest an allosteric mechanism for nuclear import complex disassembly by RanGTP.

Structural basis for nuclear import complex dissociation by RanGTP.,Lee SJ, Matsuura Y, Liu SM, Stewart M Nature. 2005 Jun 2;435(7042):693-6. Epub 2005 May 1. PMID:15864302^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Lee SJ, Matsuura Y, Liu SM, Stewart M. Structural basis for nuclear import complex dissociation by RanGTP. Nature. 2005 Jun 2;435(7042):693-6. Epub 2005 May 1. PMID:15864302 doi:10.1038/nature03578

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2bku"

@@ Line 3: / Line 3: @@
 <StructureSection load='2bku' size='340' side='right'caption='[[2bku]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2bku]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824] and [http://en.wikipedia.org/wiki/Canlf Canlf]. The January 2007 RCSB PDB [http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Importins''  by David S. Goodsell is [http://dx.doi.org/10.2210/rcsb_pdb/mom_2007_1 10.2210/rcsb_pdb/mom_2007_1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BKU OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2BKU FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2bku]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Canis_lupus_familiaris Canis lupus familiaris] and [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. The January 2007 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Importins''  by David S. Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2007_1 10.2210/rcsb_pdb/mom_2007_1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BKU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2BKU FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7&#8491;</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2bku FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2bku OCA], [http://pdbe.org/2bku PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2bku RCSB], [http://www.ebi.ac.uk/pdbsum/2bku PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2bku ProSAT]</span></td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2bku FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2bku OCA], [https://pdbe.org/2bku PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2bku RCSB], [https://www.ebi.ac.uk/pdbsum/2bku PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2bku ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[http://www.uniprot.org/uniprot/IMB1_YEAST IMB1_YEAST]] Required for nuclear protein import and mediates docking of import substrate to distinct nucleoporins. Serves a receptor for nuclear localization signals. Mediates the nuclear import of histones H2A and H2B.<ref>PMID:11309407</ref>
+[https://www.uniprot.org/uniprot/RAN_CANLF RAN_CANLF] GTPase involved in nucleocytoplasmic transport, participating both to the import and the export from the nucleus of proteins and RNAs. Switches between a cytoplasmic GDP- and a nuclear GTP-bound state by nucleotide exchange and GTP hydrolysis. Nuclear import receptors such as importin beta bind their substrates only in the absence of GTP-bound RAN and release them upon direct interaction with GTP-bound RAN, while export receptors behave in the opposite way. Thereby, RAN controls cargo loading and release by transport receptors in the proper compartment and ensures the directionality of the transport. Interaction with RANBP1 induces a conformation change in the complex formed by XPO1 and RAN that triggers the release of the nuclear export signal of cargo proteins. RAN (GTP-bound form) triggers microtubule assembly at mitotic chromosomes and is required for normal mitotic spindle assembly and chromosome segregation. Required for normal progress through mitosis. The complex with BIRC5/survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2. Enhances AR-mediated transactivation.[UniProtKB:P62826]
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 36: / Line 37: @@
 __TOC__
 </StructureSection>
-[[Category: Atcc 18824]]
+[[Category: Canis lupus familiaris]]
-[[Category: Canlf]]
 [[Category: Importins]]
 [[Category: Large Structures]]
 [[Category: RCSB PDB Molecule of the Month]]
-[[Category: Lee, S J]]
+[[Category: Saccharomyces cerevisiae]]
-[[Category: Liu, S M]]
+[[Category: Lee SJ]]
-[[Category: Matsuura, Y]]
+[[Category: Liu SM]]
-[[Category: Stewart, M]]
+[[Category: Matsuura Y]]
-[[Category: Gtp binding]]
+[[Category: Stewart M]]
-[[Category: Importin-beta]]
-[[Category: Nuclear transport]]
-[[Category: Protein transport]]
-[[Category: Rangtp]]

2bku

From Proteopedia

Current revision

Kap95p:RanGTP complex

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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