2e0g: Difference between revisions
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== | ==DnaA N-terminal domain== | ||
<StructureSection load='2e0g' size='340' side='right'caption='[[2e0g]]' scene=''> | |||
== Structural highlights == | |||
[[ | <table><tr><td colspan='2'>[[2e0g]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2E0G OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2E0G FirstGlance]. <br> | ||
[[ | </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=2e0g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2e0g OCA], [https://pdbe.org/2e0g PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2e0g RCSB], [https://www.ebi.ac.uk/pdbsum/2e0g PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2e0g ProSAT]</span></td></tr> | ||
[ | </table> | ||
[[ | == Function == | ||
[https://www.uniprot.org/uniprot/DNAA_ECOLI DNAA_ECOLI] Plays a key role in the initiation and regulation of chromosomal replication. Binds in an ATP-dependent fashion to the origin of replication (oriC) to initiate formation of the DNA replication initiation complex exactly once per cell cycle. Binds the DnaA box (consensus sequence 5'-TTATC[CA]A[CA]A-3'); subsequent binding of DNA polymerase III subunits leads to replisome formation. The DnaA-ATP form converts to DnaA-ADP; once converted to ADP the protein cannot initiate replication, ensuring only 1 round of replication per cell cycle. DnaA can inhibit its own gene expression as well as that of other genes such as dam, rpoH, ftsA and mioC.<ref>PMID:9242693</ref> <ref>PMID:16077105</ref> <ref>PMID:17699754</ref> Also required for replication of plasmid DNA; binds 4 dnaA boxes in the minimal plasmid RK2 replication origin (oriV).<ref>PMID:9242693</ref> <ref>PMID:16077105</ref> <ref>PMID:17699754</ref> | |||
[ | == 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/e0/2e0g_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=2e0g ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
DnaA forms a homomultimeric complex with the origin of chromosomal replication (oriC) to unwind duplex DNA. The interaction of the DnaA N terminus with the DnaB helicase is crucial for the loading of DnaB onto the unwound region. Here, we determined the DnaA N terminus structure using NMR. This region (residues 1-108) consists of a rigid region (domain I) and a flexible region (domain II). Domain I has an alpha-alpha-beta-beta-alpha-beta motif, similar to that of the K homology (KH) domain, and has weak affinity for oriC single-stranded DNA, consistent with KH domain function. A hydrophobic surface carrying Trp-6 most likely forms the interface for domain I dimerization. Glu-21 is located on the opposite surface of domain I from the Trp-6 site and is crucial for DnaB helicase loading. These findings suggest a model for DnaA homomultimer formation and DnaB helicase loading on oriC. | |||
Structure and function of DnaA N-terminal domains: specific sites and mechanisms in inter-DnaA interaction and in DnaB helicase loading on oriC.,Abe Y, Jo T, Matsuda Y, Matsunaga C, Katayama T, Ueda T J Biol Chem. 2007 Jun 15;282(24):17816-27. Epub 2007 Apr 9. PMID:17420252<ref>PMID:17420252</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2e0g" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[DnaA|DnaA]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Escherichia coli K-12]] | |||
[[Category: Large Structures]] | |||
[[Category: Abe Y]] | |||
[[Category: Katayama T]] | |||
[[Category: Ueda T]] | |||