8glx: Difference between revisions
From Proteopedia
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
==CryoEM structure of the TnsC(1-503)-TnsD(1-318)-DNA complex in a 6:2:1 stoichiometry from E. coli Tn7== | |||
<StructureSection load='8glx' size='340' side='right'caption='[[8glx]], [[Resolution|resolution]] 3.88Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[8glx]] is a 10 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=8GLX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8GLX FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.88Å</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>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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=8glx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8glx OCA], [https://pdbe.org/8glx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8glx RCSB], [https://www.ebi.ac.uk/pdbsum/8glx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8glx ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/TNSC_ECOLX TNSC_ECOLX] TnsC binds non-specifically to DNA in the presence of ATP. It is required for Tn7 transposition. TnsABC + TnsD promote high-frequency insertion of Tn7 into a specific target site known as att-Tn7 whereas TnsABC + TnsE promote low-frequency insertion into many different sites. | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The Tn7 family of transposons is notable for its highly regulated integration mechanisms, including programmable RNA-guided transposition. The targeting pathways rely on dedicated target selection proteins from the TniQ family and the AAA+ adaptor TnsC to recruit and activate the transposase at specific target sites. Here, we report the cryoelectron microscopy (cryo-EM) structures of TnsC bound to the TniQ domain of TnsD from prototypical Tn7 and unveil key regulatory steps stemming from unique behaviors of ATP- versus ADP-bound TnsC. We show that TnsD recruits ADP-bound dimers of TnsC and acts as an exchange factor to release one protomer with exchange to ATP. This loading process explains how TnsC assembles a heptameric ring unidirectionally from the target site. This unique loading process results in functionally distinct TnsC protomers within the ring, providing a checkpoint for target immunity and explaining how insertions at programmed sites precisely occur in a specific orientation across Tn7 elements. | |||
Assembly of the Tn7 targeting complex by a regulated stepwise process.,Shen Y, Krishnan SS, Petassi MT, Hancock MA, Peters JE, Guarne A Mol Cell. 2024 Jun 20;84(12):2368-2381.e6. doi: 10.1016/j.molcel.2024.05.012. , Epub 2024 Jun 3. PMID:38834067<ref>PMID:38834067</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 8glx" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Escherichia coli]] | |||
[[Category: Large Structures]] | |||
[[Category: Guarne A]] | |||
[[Category: Shen Y]] | |||
Latest revision as of 06:03, 31 July 2024
CryoEM structure of the TnsC(1-503)-TnsD(1-318)-DNA complex in a 6:2:1 stoichiometry from E. coli Tn7
| ||||||||||||
