1ox8: Difference between revisions

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<StructureSection load='1ox8' size='340' side='right'caption='[[1ox8]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
<StructureSection load='1ox8' size='340' side='right'caption='[[1ox8]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1ox8]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Eco57 Eco57]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OX8 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1OX8 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1ox8]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7 Escherichia coli O157:H7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OX8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1OX8 FirstGlance]. <br>
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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]] 2.2&#8491;</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SSPB OR B3228 OR Z4586 OR ECS4101 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83334 ECO57])</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1ox8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ox8 OCA], [http://pdbe.org/1ox8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ox8 RCSB], [http://www.ebi.ac.uk/pdbsum/1ox8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ox8 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=1ox8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ox8 OCA], [https://pdbe.org/1ox8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ox8 RCSB], [https://www.ebi.ac.uk/pdbsum/1ox8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ox8 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/SSPB_ECOLI SSPB_ECOLI]] Enhances recognition of ssrA-tagged proteins by the ClpX-ClpP protease; the ssrA degradation tag (AANDENYALAA) is added trans-translationally to proteins that are stalled on the ribosome, freeing the ribosome and targeting stalled peptides for degradation. SspB activates the ATPase activity of ClpX. Seems to act in concert with SspA in the regulation of several proteins during exponential and stationary-phase growth.<ref>PMID:11009422</ref> <ref>PMID:15371343</ref> <ref>PMID:12887894</ref>  Also stimulates degradation of the N-terminus of RseA (residues 1-108, alone or in complex with sigma-E) by ClpX-ClpP in a non-ssrA-mediated fashion.<ref>PMID:11009422</ref> <ref>PMID:15371343</ref> <ref>PMID:12887894</ref>
[https://www.uniprot.org/uniprot/SSPB_ECOLI SSPB_ECOLI] Enhances recognition of ssrA-tagged proteins by the ClpX-ClpP protease; the ssrA degradation tag (AANDENYALAA) is added trans-translationally to proteins that are stalled on the ribosome, freeing the ribosome and targeting stalled peptides for degradation. SspB activates the ATPase activity of ClpX. Seems to act in concert with SspA in the regulation of several proteins during exponential and stationary-phase growth.<ref>PMID:11009422</ref> <ref>PMID:15371343</ref> <ref>PMID:12887894</ref>  Also stimulates degradation of the N-terminus of RseA (residues 1-108, alone or in complex with sigma-E) by ClpX-ClpP in a non-ssrA-mediated fashion.<ref>PMID:11009422</ref> <ref>PMID:15371343</ref> <ref>PMID:12887894</ref>  
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1ox8 ConSurf].
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1ox8 ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In prokaryotes, incomplete or misfolded polypeptides emanating from a stalled ribosome are marked for degradation by the addition of an 11 residue peptide (AANDENYALAA) to their C terminus. Substrates containing this conserved degradation signal, the SsrA tag, are targeted to specific proteases including ClpXP and ClpAP. SspB was originally characterized as a stringent starvation protein and has been found to bind specifically to SsrA-tagged proteins and to enhance recognition of these proteins by the ClpXP degradation machine. Here, we report the crystal structures of SspB alone and in complex with an SsrA peptide. Unexpectedly, SspB exhibits a fold found in Sm-family RNA binding proteins. The dimeric SspB structures explain the key determinants for recognition of the SsrA tag and define a hydrophobic channel that may bind unfolded substrates.


Structural basis of degradation signal recognition by SspB, a specificity-enhancing factor for the ClpXP proteolytic machine.,Song HK, Eck MJ Mol Cell. 2003 Jul;12(1):75-86. PMID:12887894<ref>PMID:12887894</ref>
==See Also==
 
*[[Stringent starvation protein 3D structures|Stringent starvation protein 3D structures]]
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ox8" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Eco57]]
[[Category: Escherichia coli O157:H7]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Eck, M J]]
[[Category: Eck MJ]]
[[Category: Song, H K]]
[[Category: Song HK]]
[[Category: Hydrolase activator]]
[[Category: Rna-binding property]]

Revision as of 08:51, 17 April 2024

Crystal structure of SspBCrystal structure of SspB

Structural highlights

1ox8 is a 2 chain structure with sequence from Escherichia coli O157:H7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.2Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SSPB_ECOLI Enhances recognition of ssrA-tagged proteins by the ClpX-ClpP protease; the ssrA degradation tag (AANDENYALAA) is added trans-translationally to proteins that are stalled on the ribosome, freeing the ribosome and targeting stalled peptides for degradation. SspB activates the ATPase activity of ClpX. Seems to act in concert with SspA in the regulation of several proteins during exponential and stationary-phase growth.[1] [2] [3] Also stimulates degradation of the N-terminus of RseA (residues 1-108, alone or in complex with sigma-E) by ClpX-ClpP in a non-ssrA-mediated fashion.[4] [5] [6]

Evolutionary Conservation

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

See Also

References

  1. ↑ Levchenko I, Seidel M, Sauer RT, Baker TA. A specificity-enhancing factor for the ClpXP degradation machine. Science. 2000 Sep 29;289(5488):2354-6. PMID:11009422
  2. ↑ Flynn JM, Levchenko I, Sauer RT, Baker TA. Modulating substrate choice: the SspB adaptor delivers a regulator of the extracytoplasmic-stress response to the AAA+ protease ClpXP for degradation. Genes Dev. 2004 Sep 15;18(18):2292-301. PMID:15371343 doi:http://dx.doi.org/10.1101/gad.1240104
  3. ↑ Song HK, Eck MJ. Structural basis of degradation signal recognition by SspB, a specificity-enhancing factor for the ClpXP proteolytic machine. Mol Cell. 2003 Jul;12(1):75-86. PMID:12887894
  4. ↑ Levchenko I, Seidel M, Sauer RT, Baker TA. A specificity-enhancing factor for the ClpXP degradation machine. Science. 2000 Sep 29;289(5488):2354-6. PMID:11009422
  5. ↑ Flynn JM, Levchenko I, Sauer RT, Baker TA. Modulating substrate choice: the SspB adaptor delivers a regulator of the extracytoplasmic-stress response to the AAA+ protease ClpXP for degradation. Genes Dev. 2004 Sep 15;18(18):2292-301. PMID:15371343 doi:http://dx.doi.org/10.1101/gad.1240104
  6. ↑ Song HK, Eck MJ. Structural basis of degradation signal recognition by SspB, a specificity-enhancing factor for the ClpXP proteolytic machine. Mol Cell. 2003 Jul;12(1):75-86. PMID:12887894

1ox8, resolution 2.20Å

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