View source for 1ou8


==structure of an AAA+ protease delivery protein in complex with a peptide degradation tag==
<StructureSection load='1ou8' size='340' side='right'caption='[[1ou8]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ou8]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacterium_influenzae"_lehmann_and_neumann_1896 "bacterium influenzae" lehmann and neumann 1896]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OU8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1OU8 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1ou9|1ou9]], [[1oul|1oul]]</div></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SSPB ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=727 "Bacterium influenzae" Lehmann and Neumann 1896])</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=1ou8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ou8 OCA], [https://pdbe.org/1ou8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ou8 RCSB], [https://www.ebi.ac.uk/pdbsum/1ou8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ou8 ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/SSPB_HAEIN SSPB_HAEIN]] 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 (By similarity).  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 (By similarity). 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ou/1ou8_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=1ou8 ConSurf].
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== Publication Abstract from PubMed ==
Substrate selection by AAA+ ATPases that function to unfold proteins or alter protein conformation is often regulated by delivery or adaptor proteins. SspB is a protein dimer that binds to the ssrA degradation tag and delivers proteins bearing this tag to ClpXP, an AAA+ protease, for degradation. Here, we describe the structure of the peptide binding domain of H. influenzae SspB in complex with an ssrA peptide at 1.6 A resolution. The ssrA peptides are bound in well-defined clefts located at the extreme ends of the SspB homodimer. SspB contacts residues within the N-terminal and central regions of the 11 residue ssrA tag but leaves the C-terminal residues exposed and positioned to dock with ClpX. This structure, taken together with biochemical analysis of SspB, suggests mechanisms by which proteins like SspB escort substrates to AAA+ ATPases and enhance the specificity and affinity of target recognition.

Structure of a delivery protein for an AAA+ protease in complex with a peptide degradation tag.,Levchenko I, Grant RA, Wah DA, Sauer RT, Baker TA Mol Cell. 2003 Aug;12(2):365-72. PMID:14536076<ref>PMID:14536076</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1ou8" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacterium influenzae lehmann and neumann 1896]]
[[Category: Large Structures]]
[[Category: Baker, T A]]
[[Category: Grant, R A]]
[[Category: Levchenko, I]]
[[Category: Sauer, R T]]
[[Category: Wah, D A]]
[[Category: Homodimer]]
[[Category: Peptide-binding pocket]]
[[Category: Protein-peptide complex]]
[[Category: Transport protein]]