2rrn

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==Solution structure of SecDF periplasmic domain P4==
==Solution structure of SecDF periplasmic domain P4==
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<StructureSection load='2rrn' size='340' side='right'caption='[[2rrn]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
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<StructureSection load='2rrn' size='340' side='right'caption='[[2rrn]]' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[2rrn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thet8 Thet8]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2RRN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2RRN FirstGlance]. <br>
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<table><tr><td colspan='2'>[[2rrn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB8 Thermus thermophilus HB8]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2RRN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2RRN FirstGlance]. <br>
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</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3aqo|3aqo]], [[3aqp|3aqp]]</div></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=2rrn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2rrn OCA], [https://pdbe.org/2rrn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2rrn RCSB], [https://www.ebi.ac.uk/pdbsum/2rrn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2rrn 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=2rrn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2rrn OCA], [https://pdbe.org/2rrn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2rrn RCSB], [https://www.ebi.ac.uk/pdbsum/2rrn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2rrn ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[https://www.uniprot.org/uniprot/SECDF_THET8 SECDF_THET8]] Conducts protons, which can be regulated by a proton gradient or by binding of an unfolded protein. Proton conduction requires the large periplasmic domain of the SecD.[HAMAP-Rule:MF_01463_B] Part of the Sec protein translocase complex. Interacts with the SecYEG preprotein conducting channel. SecDF uses the proton motive force (PMF) to complete protein translocation after the ATP-dependent function of SecA.[HAMAP-Rule:MF_01463_B]
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[https://www.uniprot.org/uniprot/SECDF_THET8 SECDF_THET8] Conducts protons, which can be regulated by a proton gradient or by binding of an unfolded protein. Proton conduction requires the large periplasmic domain of the SecD.[HAMAP-Rule:MF_01463_B] Part of the Sec protein translocase complex. Interacts with the SecYEG preprotein conducting channel. SecDF uses the proton motive force (PMF) to complete protein translocation after the ATP-dependent function of SecA.[HAMAP-Rule:MF_01463_B]
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Protein translocation across the bacterial membrane, mediated by the secretory translocon SecYEG and the SecA ATPase, is enhanced by proton motive force and membrane-integrated SecDF, which associates with SecYEG. The role of SecDF has remained unclear, although it is proposed to function in later stages of translocation as well as in membrane protein biogenesis. Here, we determined the crystal structure of Thermus thermophilus SecDF at 3.3 A resolution, revealing a pseudo-symmetrical, 12-helix transmembrane domain belonging to the RND superfamily and two major periplasmic domains, P1 and P4. Higher-resolution analysis of the periplasmic domains suggested that P1, which binds an unfolded protein, undergoes functionally important conformational changes. In vitro analyses identified an ATP-independent step of protein translocation that requires both SecDF and proton motive force. Electrophysiological analyses revealed that SecDF conducts protons in a manner dependent on pH and the presence of an unfolded protein, with conserved Asp and Arg residues at the transmembrane interface between SecD and SecF playing essential roles in the movements of protons and preproteins. Therefore, we propose that SecDF functions as a membrane-integrated chaperone, powered by proton motive force, to achieve ATP-independent protein translocation.
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Structure and function of a membrane component SecDF that enhances protein export.,Tsukazaki T, Mori H, Echizen Y, Ishitani R, Fukai S, Tanaka T, Perederina A, Vassylyev DG, Kohno T, Maturana AD, Ito K, Nureki O Nature. 2011 May 11;474(7350):235-8. doi: 10.1038/nature09980. PMID:21562494<ref>PMID:21562494</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 2rrn" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Thet8]]
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[[Category: Thermus thermophilus HB8]]
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[[Category: Echizen, Y]]
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[[Category: Echizen Y]]
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[[Category: Kohno, T]]
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[[Category: Kohno T]]
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[[Category: Nureki, O]]
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[[Category: Nureki O]]
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[[Category: Tanaka, T]]
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[[Category: Tanaka T]]
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[[Category: Tsukazaki, T]]
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[[Category: Tsukazaki T]]
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[[Category: Periplasmic domain]]
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[[Category: Protein transport]]
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[[Category: Secdf]]
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Current revision

Solution structure of SecDF periplasmic domain P4

PDB ID 2rrn

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