1em8

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Current revision (07:04, 7 February 2024) (edit) (undo)
 
(12 intermediate revisions not shown.)
Line 1: Line 1:
-
[[Image:1em8.gif|left|200px]]
 
-
<!--
+
==Crystal structure of chi and psi subunit heterodimer from DNA POL III==
-
The line below this paragraph, containing "STRUCTURE_1em8", creates the "Structure Box" on the page.
+
<StructureSection load='1em8' size='340' side='right'caption='[[1em8]], [[Resolution|resolution]] 2.10&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'>[[1em8]] is a 4 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=1EM8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EM8 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]] 2.1&#8491;</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=1em8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1em8 OCA], [https://pdbe.org/1em8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1em8 RCSB], [https://www.ebi.ac.uk/pdbsum/1em8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1em8 ProSAT]</span></td></tr>
-
{{STRUCTURE_1em8| PDB=1em8 | SCENE= }}
+
</table>
 +
== Function ==
 +
[https://www.uniprot.org/uniprot/HOLC_ECOLI HOLC_ECOLI] DNA polymerase III is a complex, multichain enzyme responsible for most of the replicative synthesis in bacteria. This DNA polymerase also exhibits 3' to 5' exonuclease activity.
 +
== 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/em/1em8_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=1em8 ConSurf].
 +
<div style="clear:both"></div>
-
'''Crystal structure of chi and psi subunit heterodimer from DNA POL III'''
+
==See Also==
-
 
+
*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
-
 
+
__TOC__
-
==Overview==
+
</StructureSection>
-
The chi (chi) and psi (psi) subunits of Escherichia coli DNA polymerase III form a heterodimer that is associated with the ATP-dependent clamp-loader machinery. In E. coli, the chi:psi heterodimer serves as a bridge between the clamp-loader complex and the single-stranded DNA-binding protein. We determined the crystal structure of the chi:psi heterodimer at 2.1 A resolution. Although neither chi (147 residues) nor psi (137 residues) bind to nucleotides, the fold of each protein is similar to the folds of mononucleotide-(chi) or dinucleotide-(psi) binding proteins, without marked similarity to the structures of the clamp-loader subunits. Genes encoding chi and psi proteins are found to be readily identifiable in several bacterial genomes and sequence alignments showed that residues at the chi:psi interface are highly conserved in both proteins, suggesting that the heterodimeric interaction is of functional significance. The conservation of surface-exposed residues is restricted to the interfacial region and to just two other regions in the chi:psi complex. One of the conserved regions was found to be located on chi, distal to the psi interaction region, and we identified this as the binding site for a C-terminal segment of the single-stranded DNA-binding protein. The other region of sequence conservation is localized to an N-terminal segment of psi (26 residues) that is disordered in the crystal structure. We speculate that psi is linked to the clamp-loader complex by this flexible, but conserved, N-terminal segment, and that the chi:psi unit is linked to the single-stranded DNA-binding protein via the distal surface of chi. The base of the clamp-loader complex has an open C-shaped structure, and the shape of the chi:psi complex is suggestive of a loose docking within the crevice formed by the open faces of the delta and delta' subunits of the clamp-loader.
+
-
 
+
-
==About this Structure==
+
-
1EM8 is a [[Protein complex]] structure of sequences 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=1EM8 OCA].
+
-
 
+
-
==Reference==
+
-
Crystal structure of the chi:psi sub-assembly of the Escherichia coli DNA polymerase clamp-loader complex., Gulbis JM, Kazmirski SL, Finkelstein J, Kelman Z, O'Donnell M, Kuriyan J, Eur J Biochem. 2004 Jan;271(2):439-49. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/14717711 14717711]
+
-
[[Category: DNA-directed DNA polymerase]]
+
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
-
[[Category: Protein complex]]
+
[[Category: Large Structures]]
-
[[Category: Donnell, M O.]]
+
[[Category: Finkelstein J]]
-
[[Category: Finkelstein, J.]]
+
[[Category: Gulbis JM]]
-
[[Category: Gulbis, J M.]]
+
[[Category: Kuriyan J]]
-
[[Category: Kuriyan, J.]]
+
[[Category: O'Donnell M]]
-
[[Category: Alpha-beta fold]]
+
-
[[Category: Clamp-loader]]
+
-
[[Category: Dna pol iii]]
+
-
[[Category: Heterodimer]]
+
-
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:16:12 2008''
+

Current revision

Crystal structure of chi and psi subunit heterodimer from DNA POL III

PDB ID 1em8

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1em8"
Personal tools