6iu7

From Proteopedia

(Difference between revisions)

Current revision

Crystal structure of importin-alpha1 bound to the 53BP1 nuclear localization signal (wild-type)

Structural highlights

6iu7 is a 2 chain structure with sequence from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.9Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

IMA1_MOUSE Functions in nuclear protein import as an adapter protein for nuclear receptor KPNB1. Binds specifically and directly to substrates containing either a simple or bipartite NLS motif. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus.

Publication Abstract from PubMed

53BP1 (TP53-binding protein 1) plays a key role in DNA double-strand break repair by promoting non-homologous end joining (NHEJ) especially during G1 phase of the cell cycle. Nuclear import of 53BP1 is required for proper localization of 53BP1 and maintenance of genome integrity. 53BP1 has a classical bipartite nuclear localization signal (NLS) of sequence 1666-GKRKLITSEEERSPAKRGRKS-1686. Ser1678 within the 53BP1 NLS can be phosphorylated by CDK1/cyclin B, and a phosphomimetic substitution of Ser1678 with aspartate has been shown to negatively regulate nuclear import of 53BP1. Here, the X-ray crystal structures of the nuclear import adaptor importin-alpha1 bound to the wild-type 53BP1 NLS and the S1678D mutant of 53BP1 NLS are reported at resolutions of 1.9 and 1.7A, respectively. In the wild-type structure, not only the two basic clusters of the 53BP1 NLS but also the linker region between the basic clusters made extensive interactions with importin-alpha1. In the mutant structure, the linker region between the basic clusters in the 53BP1 NLS made fewer interactions with importin-alpha1 than those observed in the wild-type structure. However, biochemical binding assays using purified proteins showed that the 53BP1 mutation S1678D reduces the binding affinity to importin-alpha1 only to a modest extent. Implications of these findings for regulatory mechanism of 53BP1 nuclear import are discussed.

Structural and biochemical characterization of the recognition of the 53BP1 nuclear localization signal by importin-alpha.,Matsuura Y Biochem Biophys Res Commun. 2019 Mar 5;510(2):236-241. doi:, 10.1016/j.bbrc.2019.01.075. Epub 2019 Jan 23. PMID:30685087^[1]

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

References

↑ Matsuura Y. Structural and biochemical characterization of the recognition of the 53BP1 nuclear localization signal by importin-alpha. Biochem Biophys Res Commun. 2019 Mar 5;510(2):236-241. doi:, 10.1016/j.bbrc.2019.01.075. Epub 2019 Jan 23. PMID:30685087 doi:http://dx.doi.org/10.1016/j.bbrc.2019.01.075

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6iu7"

Categories: Homo sapiens | Large Structures | Mus musculus | Matsuura Y

@@ Line 1: / Line 1: @@
 ==Crystal structure of importin-alpha1 bound to the 53BP1 nuclear localization signal (wild-type)==
-<StructureSection load='6iu7' size='340' side='right' caption='[[6iu7]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
+<StructureSection load='6iu7' size='340' side='right'caption='[[6iu7]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6iu7]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IU7 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6IU7 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6iu7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IU7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6IU7 FirstGlance]. <br>
-</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6iua|6iua]]</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]] 1.9&#8491;</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Kpna2, Rch1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice]), TP53BP1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=6iu7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6iu7 OCA], [https://pdbe.org/6iu7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6iu7 RCSB], [https://www.ebi.ac.uk/pdbsum/6iu7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6iu7 ProSAT]</span></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=6iu7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6iu7 OCA], [http://pdbe.org/6iu7 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6iu7 RCSB], [http://www.ebi.ac.uk/pdbsum/6iu7 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6iu7 ProSAT]</span></td></tr>
 </table>
-== Disease ==
-[[http://www.uniprot.org/uniprot/TP53B_HUMAN TP53B_HUMAN]] Note=A chromosomal aberration involving TP53BP1 is found in a form of myeloproliferative disorder chronic with eosinophilia. Translocation t(5;15)(q33;q22) with PDGFRB creating a TP53BP1-PDGFRB fusion protein.
 == Function ==
-[[http://www.uniprot.org/uniprot/IMA1_MOUSE IMA1_MOUSE]] Functions in nuclear protein import as an adapter protein for nuclear receptor KPNB1. Binds specifically and directly to substrates containing either a simple or bipartite NLS motif. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. [[http://www.uniprot.org/uniprot/TP53B_HUMAN TP53B_HUMAN]] Plays a key role in the response to DNA damage. May have a role in checkpoint signaling during mitosis. Enhances TP53-mediated transcriptional activation.<ref>PMID:12364621</ref> <ref>PMID:17190600</ref>
+[https://www.uniprot.org/uniprot/IMA1_MOUSE IMA1_MOUSE] Functions in nuclear protein import as an adapter protein for nuclear receptor KPNB1. Binds specifically and directly to substrates containing either a simple or bipartite NLS motif. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus.
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 21: / Line 18: @@
 </div>
 <div class="pdbe-citations 6iu7" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Importin 3D structures|Importin 3D structures]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Human]]
+[[Category: Homo sapiens]]
-[[Category: Lk3 transgenic mice]]
+[[Category: Large Structures]]
-[[Category: Matsuura, Y]]
+[[Category: Mus musculus]]
-[[Category: Importin]]
+[[Category: Matsuura Y]]
-[[Category: Nl]]
-[[Category: Transport protein]]
-[[Category: Transport protein-protein binding complex]]

6iu7

From Proteopedia

Current revision

Crystal structure of importin-alpha1 bound to the 53BP1 nuclear localization signal (wild-type)

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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