View source for 6rax


==D. melanogaster CMG-DNA, State 1B==
<SX load='6rax' size='340' side='right' viewer='molstar' caption='[[6rax]], [[Resolution|resolution]] 3.99&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6rax]] is a 13 chain structure with sequence from [http://en.wikipedia.org/wiki/Drome Drome]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6RAX OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6RAX FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Mcm2, CG7538 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Psf1, CG9187-PA, Dmel\CG9187, psf1, CG9187, Dmel_CG9187 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Psf2, CG18013 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Psf3, Dmel\CG2222, CG2222, Dmel_CG2222 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Sld5, anon-WO0172774.61, Dmel\CG14549, CG14549, Dmel_CG14549 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Mcm3, Mcm3-RA, CG4206 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), dpa, CG1616 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Mcm5, CG4082 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Mcm6, CG4039 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), Mcm7, CG4978 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME]), CDC45L, anon-1Ec, CDC45, Cdc45, cdc45, D, dCDC45, dCDC45L, DmCdc45, Dmel\CG3658, EG:BACR7A4.11, CG3658, Dmel_CG3658 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME])</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://proteopedia.org/fgij/fg.htm?mol=6rax FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6rax OCA], [http://pdbe.org/6rax PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6rax RCSB], [http://www.ebi.ac.uk/pdbsum/6rax PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6rax ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/MCM7_DROME MCM7_DROME]] Acts as component of the Mcm2-7 complex (Mcm complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the Mcm2-7 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 six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity.<ref>PMID:16798881</ref> <ref>PMID:20122406</ref>  [[http://www.uniprot.org/uniprot/PSF2_DROME PSF2_DROME]] The GINS complex plays an essential role in the initiation of DNA replication. [[http://www.uniprot.org/uniprot/MCM4_DROME MCM4_DROME]] Acts as component of the Mcm2-7 complex (Mcm complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the Mcm2-7 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 six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity. Required for DNA replication and cell proliferation. Essential role in mitotic DNA replication but not in endoreplication.<ref>PMID:16798881</ref> <ref>PMID:20122406</ref>  [[http://www.uniprot.org/uniprot/MCM3_DROME MCM3_DROME]] Acts as component of the Mcm2-7 complex (Mcm complex) (Mcm complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the Mcm2-7 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 six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity.<ref>PMID:16798881</ref> <ref>PMID:20122406</ref>  [[http://www.uniprot.org/uniprot/MCM2_DROME MCM2_DROME]] Acts as component of the Mcm2-7 complex (Mcm complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the Mcm2-7 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 six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity. Required for DNA replication and cell proliferation.<ref>PMID:16798881</ref> <ref>PMID:20122406</ref> <ref>PMID:7622035</ref>  [[http://www.uniprot.org/uniprot/MCM5_DROME MCM5_DROME]] Acts as component of the Mcm2-7 complex (Mcm complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the Mcm2-7 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 six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity.<ref>PMID:16798881</ref> <ref>PMID:20122406</ref>  [[http://www.uniprot.org/uniprot/Q9VBI1_DROME Q9VBI1_DROME]] The GINS complex plays an essential role in the initiation of DNA replication.[PIRNR:PIRNR007764] [[http://www.uniprot.org/uniprot/MCM6_DROME MCM6_DROME]] Acts as component of the Mcm2-7 complex (Mcm complex) which is the putative replicative helicase essential for 'once per cell cycle' DNA replication initiation and elongation in eukaryotic cells. The active ATPase sites in the Mcm2-7 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 six ATPase active sites, however, are likely to contribute differentially to the complex helicase activity Required for DNA replication and cell proliferation. Required for mitotic cycles, endocycles, and the special S phase associated with the amplification of chorion genes; has a role in origin unwinding or fork elongation at chorion loci.<ref>PMID:11854416</ref> <ref>PMID:16798881</ref> <ref>PMID:20122406</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In the eukaryotic replisome, DNA unwinding by the Cdc45-MCM-Go-Ichi-Ni-San (GINS) (CMG) helicase requires a hexameric ring-shaped ATPase named minichromosome maintenance (MCM), which spools single-stranded DNA through its central channel. Not all six ATPase sites are required for unwinding; however, the helicase mechanism is unknown. We imaged ATP-hydrolysis-driven translocation of the CMG using cryo-electron microscopy (cryo-EM) and found that the six MCM subunits engage DNA using four neighboring protomers at a time, with ATP binding promoting DNA engagement. Morphing between different helicase states leads us to suggest a non-symmetric hand-over-hand rotary mechanism, explaining the asymmetric requirements of ATPase function around the MCM ring of the CMG. By imaging of a higher-order replisome assembly, we find that the Mrc1-Csm3-Tof1 fork-stabilization complex strengthens the interaction between parental duplex DNA and the CMG at the fork, which might support the coupling between DNA translocation and fork unwinding.

Molecular Basis for ATP-Hydrolysis-Driven DNA Translocation by the CMG Helicase of the Eukaryotic Replisome.,Eickhoff P, Kose HB, Martino F, Petojevic T, Abid Ali F, Locke J, Tamberg N, Nans A, Berger JM, Botchan MR, Yardimci H, Costa A Cell Rep. 2019 Sep 3;28(10):2673-2688.e8. doi: 10.1016/j.celrep.2019.07.104. PMID:31484077<ref>PMID:31484077</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6rax" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</SX>
[[Category: DNA helicase]]
[[Category: Drome]]
[[Category: Large Structures]]
[[Category: Costa, A]]
[[Category: Eickhoff, P]]
[[Category: Martino, F]]
[[Category: Aaa+]]
[[Category: Atpase]]
[[Category: Dna unwinding]]
[[Category: Helicase]]
[[Category: Hydolase]]
[[Category: Hydrolase]]