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| | <StructureSection load='5o4p' size='340' side='right'caption='[[5o4p]], [[Resolution|resolution]] 1.86Å' scene=''> | | <StructureSection load='5o4p' size='340' side='right'caption='[[5o4p]], [[Resolution|resolution]] 1.86Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5o4p]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Cho_cell_lines Cho cell lines]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5O4P OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5O4P FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5o4p]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Cricetulus_griseus Cricetulus griseus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5O4P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5O4P FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 1.86Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">I79_019946 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10029 CHO cell lines])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=5o4p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5o4p OCA], [http://pdbe.org/5o4p PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5o4p RCSB], [http://www.ebi.ac.uk/pdbsum/5o4p PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5o4p ProSAT]</span></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=5o4p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5o4p OCA], [https://pdbe.org/5o4p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5o4p RCSB], [https://www.ebi.ac.uk/pdbsum/5o4p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5o4p ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/BIP_CRIGR BIP_CRIGR] Endoplasmic reticulum chaperone that plays a key role in protein folding and quality control in the endoplasmic reticulum lumen (By similarity). Involved in the correct folding of proteins and degradation of misfolded proteins via its interaction with DNAJC10/ERdj5, probably to facilitate the release of DNAJC10/ERdj5 from its substrate (By similarity). Acts as a key repressor of the ERN1/IRE1-mediated unfolded protein response (UPR) (PubMed:29198525). In the unstressed endoplasmic reticulum, recruited by DNAJB9/ERdj4 to the luminal region of ERN1/IRE1, leading to disrupt the dimerization of ERN1/IRE1, thereby inactivating ERN1/IRE1 (PubMed:29198525). Accumulation of misfolded protein in the endoplasmic reticulum causes release of HSPA5/BiP from ERN1/IRE1, allowing homodimerization and subsequent activation of ERN1/IRE1 (PubMed:29198525). Plays an auxiliary role in post-translational transport of small presecretory proteins across endoplasmic reticulum (ER). May function as an allosteric modulator for SEC61 channel-forming translocon complex, likely cooperating with SEC62 to enable the productive insertion of these precursors into SEC61 channel. Appears to specifically regulate translocation of precursors having inhibitory residues in their mature region that weaken channel gating.[UniProtKB:P11021][UniProtKB:P20029]<ref>PMID:29198525</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </div> | | </div> |
| | <div class="pdbe-citations 5o4p" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 5o4p" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Heat Shock Protein structures|Heat Shock Protein structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Cho cell lines]] | + | [[Category: Cricetulus griseus]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Chen, R]] | + | [[Category: Chen R]] |
| - | [[Category: Read, R]] | + | [[Category: Read R]] |
| - | [[Category: Ron, D]] | + | [[Category: Ron D]] |
| - | [[Category: Yan, Y]] | + | [[Category: Yan Y]] |
| - | [[Category: Ampylation]]
| + | |
| - | [[Category: Atp binding protein]]
| + | |
| - | [[Category: Bip/grp78]]
| + | |
| Structural highlights
Function
BIP_CRIGR Endoplasmic reticulum chaperone that plays a key role in protein folding and quality control in the endoplasmic reticulum lumen (By similarity). Involved in the correct folding of proteins and degradation of misfolded proteins via its interaction with DNAJC10/ERdj5, probably to facilitate the release of DNAJC10/ERdj5 from its substrate (By similarity). Acts as a key repressor of the ERN1/IRE1-mediated unfolded protein response (UPR) (PubMed:29198525). In the unstressed endoplasmic reticulum, recruited by DNAJB9/ERdj4 to the luminal region of ERN1/IRE1, leading to disrupt the dimerization of ERN1/IRE1, thereby inactivating ERN1/IRE1 (PubMed:29198525). Accumulation of misfolded protein in the endoplasmic reticulum causes release of HSPA5/BiP from ERN1/IRE1, allowing homodimerization and subsequent activation of ERN1/IRE1 (PubMed:29198525). Plays an auxiliary role in post-translational transport of small presecretory proteins across endoplasmic reticulum (ER). May function as an allosteric modulator for SEC61 channel-forming translocon complex, likely cooperating with SEC62 to enable the productive insertion of these precursors into SEC61 channel. Appears to specifically regulate translocation of precursors having inhibitory residues in their mature region that weaken channel gating.[UniProtKB:P11021][UniProtKB:P20029][1]
Publication Abstract from PubMed
The endoplasmic reticulum (ER)-localized Hsp70 chaperone BiP contributes to protein folding homeostasis by engaging unfolded client proteins in a process that is tightly coupled to ATP binding and hydrolysis. The inverse correlation between AMPylation and the burden of unfolded ER proteins suggests a post-translational mechanism for adjusting BiP's activity to changing levels of ER stress, but the underlying molecular details are unexplored. We present biochemical and crystallographic studies indicating that irrespective of the identity of the bound nucleotide AMPylation biases BiP towards a conformation normally attained by the ATP-bound chaperone. AMPylation does not affect the interaction between BiP and J-protein co-factors but appears to allosterically impair J protein-stimulated ATP-hydrolysis, resulting in the inability of modified BiP to attain high affinity for its substrates. These findings suggest a molecular mechanism by which AMPylation serves as a switch to inactivate BiP, limiting its interactions with substrates whilst conserving ATP.
AMPylation targets the rate-limiting step of BiP's ATPase cycle for its functional inactivation.,Preissler S, Rohland L, Yan Y, Chen R, Read RJ, Ron D Elife. 2017 Oct 24;6. pii: e29428. doi: 10.7554/eLife.29428. PMID:29064368[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Amin-Wetzel N, Saunders RA, Kamphuis MJ, Rato C, Preissler S, Harding HP, Ron D. A J-Protein Co-chaperone Recruits BiP to Monomerize IRE1 and Repress the Unfolded Protein Response. Cell. 2017 Dec 14;171(7):1625-1637.e13. doi: 10.1016/j.cell.2017.10.040. Epub, 2017 Nov 30. PMID:29198525 doi:http://dx.doi.org/10.1016/j.cell.2017.10.040
- ↑ Preissler S, Rohland L, Yan Y, Chen R, Read RJ, Ron D. AMPylation targets the rate-limiting step of BiP's ATPase cycle for its functional inactivation. Elife. 2017 Oct 24;6. pii: e29428. doi: 10.7554/eLife.29428. PMID:29064368 doi:http://dx.doi.org/10.7554/eLife.29428
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