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{{Seed}}
[[Image:3vub.png|left|200px]]


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==CCDB, A TOPOISOMERASE POISON FROM E. COLI==
The line below this paragraph, containing "STRUCTURE_3vub", creates the "Structure Box" on the page.
<StructureSection load='3vub' size='340' side='right'caption='[[3vub]], [[Resolution|resolution]] 1.40&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[3vub]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VUB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3VUB FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.4&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
{{STRUCTURE_3vub|  PDB=3vub  |  SCENE=  }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3vub FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3vub OCA], [https://pdbe.org/3vub PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3vub RCSB], [https://www.ebi.ac.uk/pdbsum/3vub PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3vub ProSAT]</span></td></tr>
 
</table>
===CCDB, A TOPOISOMERASE POISON FROM E. COLI===
== Function ==
 
[https://www.uniprot.org/uniprot/CCDB_ECOLI CCDB_ECOLI] Toxic component of a toxin-antitoxin (TA) module, functioning in plasmid maintainence. Responsible for the post-segregational killing (PSK) of plasmid-free cells, also referred to as a plasmid addiction system. Half-life of over 2 hours. Cell killing by CcdB is accompanied by filamentation, defects in chromosome and plasmid segregation, defects in cell division, formation of anucleate cells, decreased DNA synthesis and plasmid loss. Interferes with the activity of DNA gyrase, inducing it to form a covalent GyrA-DNA complex that cannot be resolved, thus promoting breakage of plasmid and chromosomal DNA. DNA breakage requires hydrolyzable ATP. Toxicity is inhibited by labile antitoxin CcdA, which blocks the activity of CcdB; CcdA also removes bound CcdB protein from the CcdB-GyrA complex by forming a CcdA-CcdB complex, a process termed rejuvenation. Also acts to inhibit partitioning of the chromosomal DNA. Functions as a transcriptional corepressor for the ccdAB operon, repression also requires CcdA.<ref>PMID:6327993</ref> <ref>PMID:2651399</ref> <ref>PMID:6308648</ref> <ref>PMID:2615761</ref> <ref>PMID:1324324</ref> <ref>PMID:8604132</ref>
 
== Evolutionary Conservation ==
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    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/vu/3vub_consurf.spt"</scriptWhenChecked>
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    <text>to colour the structure by Evolutionary Conservation</text>
==About this Structure==
  </jmolCheckbox>
3VUB is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VUB OCA].  
</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=3vub ConSurf].
 
<div style="clear:both"></div>
==Reference==
== References ==
Crystal structure of CcdB, a topoisomerase poison from E. coli., Loris R, Dao-Thi MH, Bahassi EM, Van Melderen L, Poortmans F, Liddington R, Couturier M, Wyns L, J Mol Biol. 1999 Jan 29;285(4):1667-77. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9917404 9917404]
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Bahasi, E M.]]
[[Category: Bahasi EM]]
[[Category: Couturier, M.]]
[[Category: Couturier M]]
[[Category: Dao-Thi, M H.]]
[[Category: Dao-Thi M-H]]
[[Category: Liddington, R.]]
[[Category: Liddington R]]
[[Category: Loris, R.]]
[[Category: Loris R]]
[[Category: Melderen, L Van.]]
[[Category: Poortmans F]]
[[Category: Poortmans, F.]]
[[Category: Van Melderen L]]
[[Category: Wyns, L.]]
[[Category: Wyns L]]
[[Category: Ccdb]]
[[Category: Plasmid]]
[[Category: Topoisomerase poison]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul  3 13:12:24 2008''

Latest revision as of 13:35, 1 March 2024

CCDB, A TOPOISOMERASE POISON FROM E. COLICCDB, A TOPOISOMERASE POISON FROM E. COLI

Structural highlights

3vub is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.4Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CCDB_ECOLI Toxic component of a toxin-antitoxin (TA) module, functioning in plasmid maintainence. Responsible for the post-segregational killing (PSK) of plasmid-free cells, also referred to as a plasmid addiction system. Half-life of over 2 hours. Cell killing by CcdB is accompanied by filamentation, defects in chromosome and plasmid segregation, defects in cell division, formation of anucleate cells, decreased DNA synthesis and plasmid loss. Interferes with the activity of DNA gyrase, inducing it to form a covalent GyrA-DNA complex that cannot be resolved, thus promoting breakage of plasmid and chromosomal DNA. DNA breakage requires hydrolyzable ATP. Toxicity is inhibited by labile antitoxin CcdA, which blocks the activity of CcdB; CcdA also removes bound CcdB protein from the CcdB-GyrA complex by forming a CcdA-CcdB complex, a process termed rejuvenation. Also acts to inhibit partitioning of the chromosomal DNA. Functions as a transcriptional corepressor for the ccdAB operon, repression also requires CcdA.[1] [2] [3] [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.

References

  1. ↑ Miki T, Yoshioka K, Horiuchi T. Control of cell division by sex factor F in Escherichia coli. I. The 42.84-43.6 F segment couples cell division of the host bacteria with replication of plasmid DNA. J Mol Biol. 1984 Apr 25;174(4):605-25. PMID:6327993
  2. ↑ Tam JE, Kline BC. Control of the ccd operon in plasmid F. J Bacteriol. 1989 May;171(5):2353-60. PMID:2651399
  3. ↑ Ogura T, Hiraga S. Mini-F plasmid genes that couple host cell division to plasmid proliferation. Proc Natl Acad Sci U S A. 1983 Aug;80(15):4784-8. PMID:6308648
  4. ↑ Tam JE, Kline BC. The F plasmid ccd autorepressor is a complex of CcdA and CcdB proteins. Mol Gen Genet. 1989 Oct;219(1-2):26-32. PMID:2615761
  5. ↑ Bernard P, Couturier M. Cell killing by the F plasmid CcdB protein involves poisoning of DNA-topoisomerase II complexes. J Mol Biol. 1992 Aug 5;226(3):735-45. PMID:1324324
  6. ↑ Maki S, Takiguchi S, Horiuchi T, Sekimizu K, Miki T. Partner switching mechanisms in inactivation and rejuvenation of Escherichia coli DNA gyrase by F plasmid proteins LetD (CcdB) and LetA (CcdA). J Mol Biol. 1996 Mar 1;256(3):473-82. PMID:8604132 doi:http://dx.doi.org/10.1006/jmbi.1996.0102

3vub, resolution 1.40Å

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