Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
292
datasets available to search
ShareScore release 0.9.0
Dataset results
292 results for “Helicase”
Human RECQL5 helicase; A Target Enabling Package
<p>RECQL5 is a member of the RecQ family of helicase which have important functions in DNA repair pathways and maintenance of genome integrity. RECQL5 has recently been identified as a synthetic lethal candidate in various haematological malignancies and has been verified by knockdown to sensitize myeloproliferative neoplasms (MPN) to DNA damaging agents. In this TEP we have expressed purified and determined the first ever crystal structures of RECQL5, in both APO and ADP/Mg2+ bound forms which crystallize in two distinctly different conformations. In vitro DNA stimulated ATPase assays suitable for high throughput screening have been developed as well as lower throughput orthogonal assays to verify potential hits. A fragment screening campaign has been initiated and single fragment hit has identified a potential allosteric site that may be targeted to block the transition between conformations that it thought to be part of the helicase mechanism. Finally included as part of the package we present 3 validated RECQL5 binding nanobodies, one of which is a potent inhibitor of RECQL5 ATPase activity and is suitable for use as a tool reagent to investigate inhibition of RECQL5 and its complexes in vitro.</p>
Strand-switching mechanism of Pif1 helicase induced by its collision with a G-quadruplex embedded in dsDNA_data_NAR
<p>This document includes data corresponding to the paper entitled :"Strand-switching mechanism of Pif1 helicase induced by its collision with a G-quadruplex embedded in dsDNA" published in Nucleic Acid Research, 2022. The link to the zenodo depository of the homemade software to open the data is given in the readme.txt file as well as the way the data files are organized</p>
Cdt1 inhibits CMG helicase in early S phase to separate origin licensing from DNA synthesis
A fundamental concept in eukaryotic DNA replication is the temporal separation of G1 origin licensing from S phase origin firing. Re-replication and genome instability ensue if licensing occurs after DNA synthesis has started. In humans and other vertebrates, the E3 ubiquitin ligase CRL4Cdt2 starts to degrade the licensing factor Cdt1 after origins fire, raising the question of how cells prevent re-replication in early S phase. Here, using quantitative microscopy, we show that Cdt1 inhibits DNA synthesis during an overlap period when cells fire origins while Cdt1 is still present. Cdt1 inhibits DNA synthesis by suppressing CMG helicase progression at replication forks through the MCM-binding domain of Cdt1, and DNA synthesis commences once Cdt1 is degraded. Thus, instead of separating licensing from firing to prevent re-replication in early S phase, cells separate licensing from DNA synthesis through Cdt1-mediated inhibition of CMG helicase after firing.
Datasets and Software for publication "Distinct RPA domains promote recruitment and the helicase-nuclease activities of Dna2"
<p>- Magnetic tweezers and mass photometry datasets for the publication "Distinct RPA domains promote recruitment and the helicase-nuclease activities of Dna2, Nature Communications 2021"</p> <p>- costum written Matlab Software for Helicase Analysis</p>
Protein Structure Files and Galaxy Workflows for Conducting Molecular Dynamics Simulations of Coronavirus Helicases
<p>The files included here are a set of Galaxy workflows, starting structure files (PDB, mol2, and frcmod), and specialized force field files (ZAFF) for the simulation of coronavirus helicases in the apo and drug-bound state. The inhibitor molecules include those from virtual screening (FCID1 and thioguanine), as well as experimentally validated candidates (Lumacaftor and SSYA10-001).</p>
Protein Structure Files and Galaxy Workflows for Conducting Molecular Dynamics Simulations of Flavivirus Helicases
<p>The files included here are a set of Galaxy workflows and starting structure files (PDB, mol2, and frcmod) for the simulation of flavivirus helicases in the apo and drug-bound state. The inhibitors include the 4th highest ranking compound from a virtual screening of more than 12.7 million drug-like molecules.</p>
Protein Structure Files and Galaxy Workflows for Conducting Molecular Dynamics Simulations of Coronavirus Helicases -- Output Files
<p>These are the output files generated using the input files and Galaxy workflows for coronavirus helicase simulations, from: </p> <pre>https://doi.org/10.5281/zenodo.7492987</pre>
Data for: Cdt1 inhibits CMG helicase in early S phase to separate origin licensing from DNA synthesis
Open the record for dataset details and reuse information.
SIRAH-CoV2 initiative: SARS-CoV-2 helicase (PDB id:6ZSL)
<p>This dataset contains the trajectory of a 10 microseconds-long coarse-grained molecular dynamics simulation of SARS-CoV2 Helicase protein (PDB id:6ZSL). Simulations have been performed using the SIRAH force field running with the Amber18 package at the Uruguayan National Center for Supercomputing (ClusterUY) under the conditions reported in <a href="https://pubs.acs.org/doi/10.1021/acs.jctc.9b00006">Machado et al. JCTC 2019</a>, adding 150 mM NaCl according to <a href="https://pubs.acs.org/doi/10.1021/acs.jctc.9b00953">Machado & Pantano JCTC 2020</a>. Parameters for Zinc ions are those reported in <a href="https://pubs.acs.org/doi/10.1021/acs.jcim.0c00160">Klein et al. 2020</a>.</p> <p>The files 6ZSL_SIRAHcg_rawdata_0-4us.tar, 6ZSL_SIRAHcg_rawdata_4-8us.tar, and 6ZSL_SIRAHcg_rawdata_8-10us.tar contain all the raw information required to visualize (using VMD), analyze, backmap, and eventually continue the simulations using Amber18 or higher. Step-By-Step tutorials for running, visualizing, and analyzing CG trajectories using <a href="https://academic.oup.com/bioinformatics/article/32/10/1568/1743152">SirahTools</a> can be found at www.sirahff.com.</p> <p>Additionally, the file 6ZSL_SIRAHcg_10us_prot.tar contains only the protein coordinates, while 6ZSL_SIRAHcg_10us_prot_skip10ns.tar contains one frame every 10ns.</p> <p>To take a quick look at the trajectory:</p> <p>1- Untar the file 6ZSL_SIRAHcg_10us_prot_skip10ns.tar</p> <p>2- Open the trajectory on VMD using the command line:</p> <p>vmd 6ZSL_SIRAHcg_prot.prmtop 6ZSL_SIRAHcg_prot.ncrst 6ZSL_SIRAHcg_prot_10us_skip10ns.nc -e sirah_vmdtk.tcl</p> <p>Note that you can use normal VMD drawing methods as vdw, licorice, etc., and coloring by restype, element, name, etc. </p> <p>This dataset is part of the SIRAH-CoV2 initiative.</p> <p>For further details, please contact Pablo Garay (pgaray@pasteur.edu.uy) or Sergio Pantano (spantano@pasteur.edu.uy).</p>
Protein Structure Files and Galaxy Workflows for Conducting Molecular Dynamics Simulations of Flavivirus Helicases -- Output Files
<p>These are the output files generated using the input files and Galaxy workflows for flavivirus helicase simulations, from: </p> <pre>https://doi.org/10.5281/zenodo.7493015</pre>
MM and QMMM trayectories from "Conformational Changes and ATP Hydrolysis in Zika Helicase. The Molecular Basis of a Biomolecular Motor Unveiled by Multiscale Simulations"
<p>Here are provided two trayectories from the results of "Conformational Changes and ATP Hydrolysis in Zika Helicase. The Molecular Basis of a Biomolecular Motor Unveiled by Multiscale Simulations".</p> <p><em>ZikaNS3h-MMtrajectory.nc</em> contains a Molecular Mechanics MD simulation of the system with ATP bound to the active site.</p> <p><em>TS1-mech1-QMMMtrajectory.nc</em> contains a QMMM MD simulation of the system with TS1 of the base-assisted mechanism bound to the active site.</p> <p><em>ZikaNS3h.prmtop</em> is the parameter file.</p> <p> </p>
Hemizygous loss of helicases promotes genomic instability and cancer development
Open the record for dataset details and reuse information.
Data from: Gene function rather than reproductive mode drives the evolution of RNA helicases in sexual and apomictic Boechera
Open the record for dataset details and reuse information.
A helicase-tethered ORC flip enables bidirectional helicase loading
<p>Replication origins are licensed by loading two Mcm2‑7 helicases around DNA in a head-to-head conformation poised to initiate bidirectional replication. This process requires ORC, Cdc6, and Cdt1. Although different Cdc6 and Cdt1 molecules load each helicase, whether two ORC proteins are required is unclear. Using c<span>olocalization single-molecule spectroscopy combined with</span> FRET, we investigated interactions between ORC and Mcm2‑7 during helicase loading. In the large majority of events, we observed a single ORC molecule recruiting both Mcm2‑7/Cdt1 complexes via similar interactions that end upon Cdt1 release. Between first and second helicase recruitment, a rapid change in interactions between ORC and the first Mcm2-7 occurs. Within seconds, ORC breaks the interactions mediating first Mcm2-7 recruitment, releases from its initial DNA-binding site, and forms a new interaction with the opposite face of the first Mcm2-7. This rearrangement requires release of the first Cdt1 and tethers ORC as it flips over the first Mcm2-7 to form an inverted Mcm2‑7-ORC-DNA complex required for second-helicase recruitment. To ensure correct licensing, this complex is maintained until head-to-head interactions between the two helicases are formed. Our findings reconcile previous observations and reveal a highly-coordinated series of events through which a single ORC molecule can load two oppositely-oriented helicases.</p>
Continuous millisecond conformational cycle of a DEAH box helicase reveals control of domain motions by atomic-scale transitions
<p>Data sets for the manuscript with the title "Continuous millisecond conformational cycle of a DEAH box helicase reveals control of domain motions by atomic-scale transitions".</p> <p>For further information read README</p> <p> </p> <p>Code for the MSM construction in the jupyter notebook file.</p> <p>Trajectories of opening and closing in the Trajectories.zip<br> </p> <p> </p>
Data for: Biochemical properties of naturally occurring human bloom helicase variants
<p>Bloom syndrome helicase (BLM) is a RecQ-family helicase implicated in a variety of cellular processes, including DNA replication, DNA repair, and telomere maintenance. Mutations in human <em>BLM</em> cause Bloom syndrome (BS), an autosomal recessive disorder that leads to myriad negative health impacts including a predisposition to cancer. BS-causing mutations in <em>BLM</em> often negatively impact BLM ATPase and helicase activity. While <em>BLM</em> mutations that cause BS have been well characterized both in vitro and in vivo, there are other less studied <em>BLM</em> mutations that exist in the human population that do not lead to BS. Two of these non-BS mutations, encoding BLM P868L and BLM G1120R, when homozygous, increase sister chromatid exchanges in human cells. To characterize these naturally occurring BLM mutant proteins <em>in vitro</em>, we purified the BLM catalytic core with either the P868L or G1120R substitution. We also purified a BLM K869A K870A mutant protein, which alters a lysine-rich loop proximal to the P868 residue. We found that BLM P868L and BLM G1120R were both able to hydrolyze ATP, bind diverse DNA substrates, and unwind G-quadruplex and duplex DNA structures. Molecular dynamics simulations suggest that the P868L substitution weakens the DNA interaction with the winged-helix domain of BLM and alters the orientation of lobe 1 of the ATPase domain. Because BLM P868L and BLM G1120R retain helicase function in vitro, it is likely that the increased genome instability is caused by specific impacts of the mutant proteins in vivo. Interestingly, we found that BLM K869A K870A has diminished ATPase activity compared to wild-type BLM, weakened binding to duplex DNA structures, and less robust helicase activity. Thus, the lysine-rich loop may have an important role in ATPase activity and specific binding and DNA unwinding functions in BLM.</p>
A helicase-tethered ORC flip enables bidirectional helicase loading
Open the record for dataset details and reuse information.
Data for: Biochemical properties of naturally occurring human bloom helicase variants
Open the record for dataset details and reuse information.
Data from: Rev7 and 53BP1/Crb2 prevent RecQ helicase-dependent hyper-resection of DNA double-strand breaks
Poly(ADP ribose) polymerase inhibitors (PARPi) target cancer cells deficient in homology-directed repair of DNA double-strand breaks (DSBs). In preclinical models, PARPi resistance is tied to altered nucleolytic processing (resection) at the 5' ends of a DSB. For example, loss of 53BP1 or Rev7/MAD2L2/FANCV derepresses resection to drive PARPi resistance, although the mechanisms are poorly understood. Long-range resection can be catalyzed by two machineries: the exonuclease Exo1, or the combination of a RecQ helicase and Dna2. Here, we develop a single cell microscopy assay that allows the distinct phases and machineries of resection to be interrogated simultaneously in living S. pombe cells. Using this assay, we find that the 53BP1 orthologue and Rev7 specifically repress long-range resection through the RecQ helicase-dependent pathway, thereby preventing hyper-resection. These results suggest that 'rewiring' of BRCA1-deficient cells to employ an Exo1-independent hyper-resection pathway is a driver of PARPi resistance.
Preliminary results from Zika virus helicase fragment screening
<p>Preliminary results from Zika virus helicase fragment screening</p>
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.