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4r7y

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Revision as of 15:52, 4 August 2016

Crystal structure of an active MCM hexamer

Structural highlights

4r7y is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , ,
Related:	4r7z
Activity:	DNA helicase, with EC number 3.6.4.12
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[MCM_SULSO] Presumptive replicative helicase. Has ATPase and DNA helicase activities. The latter preferentially melts 5'-tailed oligonucleotides and is stimulated by the SSB protein (single-stranded DNA binding protein). The active ATPase sites in the MCM ring are formed through the interaction surfaces of two neighboring subunits such that a critical structure of a conserved arginine finger motif is provided in trans relative to the ATP-binding site of the Walker A box of the adjacent subunit. The helicase function is proposed to use a partially sequential mode of ATP hydrolysis; the complex appears to tolerate multiple catalytically inactive subunits.^[1]

Publication Abstract from PubMed

In a previous Research article (<xref>Froelich et al., 2014</xref>), we suggested an MCM helicase activation mechanism, but were limited in discussing the ATPase domain because it was absent from the crystal structure. Here we present the crystal structure of a nearly full-length MCM hexamer that is helicase-active and thus has all features essential for unwinding DNA. The structure is a chimera of Sulfolobus solfataricus N-terminal domain and Pyrococcus furiosus ATPase domain. We discuss three major findings: 1) a novel conformation for the A-subdomain that could play a role in MCM regulation; 2) interaction of a universally conserved glutamine in the N-terminal Allosteric Communication Loop with the AAA+ domain helix-2-insert (h2i); and 3) a recessed binding pocket for the MCM ssDNA-binding motif influenced by the h2i. We suggest that during helicase activation, the h2i clamps down on the leading strand to facilitate strand retention and regulate ATP hydrolysis.

Analysis of the crystal structure of an active MCM hexamer.,Miller JM, Arachea BT, Epling LB, Enemark EJ Elife. 2014 Sep 29;3. doi: 10.7554/eLife.03433. PMID:25262915^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Carpentieri F, De Felice M, De Falco M, Rossi M, Pisani FM. Physical and functional interaction between the mini-chromosome maintenance-like DNA helicase and the single-stranded DNA binding protein from the crenarchaeon Sulfolobus solfataricus. J Biol Chem. 2002 Apr 5;277(14):12118-27. Epub 2002 Jan 30. PMID:11821426 doi:10.1074/jbc.M200091200
↑ Miller JM, Arachea BT, Epling LB, Enemark EJ. Analysis of the crystal structure of an active MCM hexamer. Elife. 2014 Sep 29;3. doi: 10.7554/eLife.03433. PMID:25262915 doi:http://dx.doi.org/10.7554/eLife.03433

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4r7y"

@@ Line 1: / Line 1: @@
 ==Crystal structure of an active MCM hexamer==
 <StructureSection load='4r7y' size='340' side='right' caption='[[4r7y]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4r7z|4r7z]]</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA_helicase DNA helicase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.4.12 3.6.4.12] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4r7y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4r7y OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4r7y RCSB], [http://www.ebi.ac.uk/pdbsum/4r7y PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4r7y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4r7y OCA], [http://pdbe.org/4r7y PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4r7y RCSB], [http://www.ebi.ac.uk/pdbsum/4r7y PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4r7y ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4r7y" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4r7y

From Proteopedia

Revision as of 15:52, 4 August 2016

Crystal structure of an active MCM hexamer

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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