Abstract:
:We developed an experimental system for studying genome instability caused by fragile X (CGG)n repeats in mammalian cells. Our method uses a selectable cassette carrying the HyTK gene under the control of the FMR1 promoter with (CGG)n repeats in its 5' UTR, which is integrated into the unique RL5 site in murine erythroid leukemia cells. Carrier-size (CGG)n repeats markedly elevated the frequency of reporter inactivation, making cells ganciclovir resistant. These resistant clones had a unique mutational signature: a change in repeat length concurrent with mutagenesis in the reporter gene. Inactivation of genes implicated in break-induced replication, including Pold3, Pold4, Rad52, Rad51, and Smarcal1, reduced the frequency of ganciclovir-resistant clones to the baseline level that was observed in the absence of (CGG)n repeats. We propose that replication fork collapse at carrier-size (CGG)n repeats can trigger break-induced replication, which results in simultaneous repeat length changes and mutagenesis at a distance.
journal_name
Nat Struct Mol Bioljournal_title
Nature structural & molecular biologyauthors
Kononenko AV,Ebersole T,Vasquez KM,Mirkin SMdoi
10.1038/s41594-018-0094-9subject
Has Abstractpub_date
2018-08-01 00:00:00pages
669-676issue
8eissn
1545-9993issn
1545-9985pii
10.1038/s41594-018-0094-9journal_volume
25pub_type
杂志文章abstract::Lipoteichoic acids (LTAs) are essential cell-wall components in Gram-positive bacteria, including the human pathogen Staphylococcus aureus, contributing to cell adhesion, cell division and antibiotic resistance. Genetic evidence has suggested that LtaA is the flippase that mediates the translocation of the lipid-linke...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/s41594-020-0425-5
更新日期:2020-06-01 00:00:00
abstract::The association of Zika virus (ZIKV) infections with microcephaly has resulted in an ongoing public-health emergency. Here we report the crystal structure of a C-terminal fragment of ZIKV nonstructural protein 1 (NS1), a major host-interaction molecule that functions in flaviviral replication, pathogenesis and immune ...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.3213
更新日期:2016-05-01 00:00:00
abstract::Intracellular membrane fusion proceeds via distinct stages of membrane docking, hemifusion and fusion pore opening and depends on interacting families of Rab, SNARE and SM proteins. Trans-SNARE complexes dock the membranes in close apposition. Efficient fusion requires further SNARE-associated proteins. They might inc...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1809
更新日期:2010-06-01 00:00:00
abstract::The regulated exocytotic release of neurotransmitter and hormones is accomplished by a complex protein machinery whose core consists of SNARE proteins and the calcium sensor synaptotagmin-1. We propose a mechanism in which the lipid membrane is intimately involved in coupling calcium sensing to release. We found that ...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/s41594-018-0130-9
更新日期:2018-10-01 00:00:00
abstract::The iota toxin produced by Clostridium perfringens type E is a binary toxin comprising two independent polypeptides: Ia, an ADP-ribosyltransferase, and Ib, which is involved in cell binding and translocation of Ia across the cell membrane. Here we report cryo-EM structures of the translocation channel Ib-pore and its ...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/s41594-020-0388-6
更新日期:2020-03-01 00:00:00
abstract::The type III secretion system (T3SS) is a macromolecular 'injectisome' that allows bacterial pathogens to transport virulence proteins into the eukaryotic host cell. This macromolecular complex is composed of connected ring-like structures that span both bacterial membranes. The crystal structures of the periplasmic d...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1603
更新日期:2009-05-01 00:00:00
abstract::Gating the ion-permeation pathway in K(+) channels requires conformational changes in activation and inactivation gates. Here we have investigated the structural alterations associated with pH-dependent inactivation gating of the KcsA-Kv1.3 K(+) channel using solid-state NMR spectroscopy in direct reference to electro...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1430
更新日期:2008-06-01 00:00:00
abstract::An amendment to this paper has been published and can be accessed via a link at the top of the paper. ...
journal_title:Nature structural & molecular biology
pub_type: 已发布勘误
doi:10.1038/s41594-019-0272-4
更新日期:2019-08-01 00:00:00
abstract::In voltage-gated sodium, potassium and calcium channels, the functions of ion conduction and voltage sensing are performed by two distinct structural units: the pore domain and the voltage-sensing domain (VSD). In the hydrogen voltage-gated channel 1 (Hv1), the VSD, unusually, performs both functions. Hv1 was recently...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1738
更新日期:2010-01-01 00:00:00
abstract::Catalysis by members of the RNase H superfamily of enzymes is generally believed to require only two Mg2+ ions that are coordinated by active-site carboxylates. By examining the catalytic process of Bacillus halodurans RNase H1 in crystallo, however, we found that the two canonical Mg2+ ions and an additional K+ faile...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/s41594-018-0099-4
更新日期:2018-08-01 00:00:00
abstract::Heterochromatin causes epigenetic repression that can be transmitted through multiple cell divisions. However, the mechanisms underlying silencing and stability of heterochromatin are not fully understood. We show that heterochromatin differs from euchromatin in histone turnover and identify histone deacetylase (HDAC)...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.2565
更新日期:2013-05-01 00:00:00
abstract::In nutrient-starved bacteria, RelA and SpoT proteins have key roles in reducing cell growth and overcoming stresses. Here we identify functional SpoT orthologs in metazoa (named Mesh1, encoded by HDDC3 in human and Q9VAM9 in Drosophila melanogaster) and reveal their structures and functions. Like the bacterial enzyme,...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1906
更新日期:2010-10-01 00:00:00
abstract::Binding of the gp120 envelope (Env) glycoprotein to the CD4 receptor is the first step in the HIV-1 infectious cycle. Although the CD4-binding site has been extensively characterized, the initial receptor interaction has been difficult to study because of major CD4-induced structural rearrangements. Here we used cryog...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.3382
更新日期:2017-04-01 00:00:00
abstract::Brr2 is a DExD/H-box helicase responsible for U4/U6 unwinding during spliceosomal activation. Brr2 contains two helicase-like domains, each of which is followed by a Sec63 domain with unknown function. We determined the crystal structure of the second Sec63 domain, which unexpectedly resembles domains 4 and 5 of DNA h...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1625
更新日期:2009-07-01 00:00:00
abstract::Bacteriophages express proteins that inactivate the CRISPR-Cas bacterial immune system. Here we report the crystal structure of the anti-CRISPR protein AcrF3 in complex with Pseudomonas aeruginosa Cas3 (PaCas3). AcrF3 forms a homodimer that locks PaCas3 in an ADP-bound form, blocks the entrance of the DNA-binding tunn...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.3269
更新日期:2016-09-01 00:00:00
abstract::Mutually exclusive splicing is a regulated means to generate protein diversity, but the underlying mechanisms are poorly understood. Here comparative genome analysis revealed the built-in intronic elements for controlling mutually exclusive splicing of the 14-3-3ξ pre-mRNA. These elements are clade specific but are ev...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1959
更新日期:2011-02-01 00:00:00
abstract::The eukaryotic exosome is a multisubunit complex typically composed of a catalytically inactive core and the Rrp44 protein, which contains 3'-to-5' exo- and endo-RNase activities. RNA substrates have been shown to be recruited through the core to reach Rrp44's exo-RNase (EXO) site. Using single-particle EM and biochem...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.2736
更新日期:2014-01-01 00:00:00
abstract::We present a structural analysis of the folding transition states of three SH3 domains. Our results reveal that the secondary structure is not yet fully formed at this stage of folding and that the solvent is only partially excluded from the interior of the protein. Comparison of the members of the transition state en...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb765
更新日期:2004-05-01 00:00:00
abstract::Multiple Argonaute proteins are implicated in gene silencing by RNA interference (RNAi), but only one is known to be an endonuclease that can cleave target mRNAs. Chimeric Argonaute proteins now reveal an unexpected mechanism by which mutations distal to the catalytic center can unmask intrinsic catalytic activity, re...
journal_title:Nature structural & molecular biology
pub_type: 评论,新闻
doi:10.1038/nsmb.2620
更新日期:2013-07-01 00:00:00
abstract::The noncoding RNA Xist recruits silencing factors to the inactive X chromosome (Xi) and facilitates re-organization of Xi structure. Here, we examine the mouse epigenomic landscape of Xi and assess how Xist alters chromatin accessibility. Xist deletion triggers a gain of accessibility of select chromatin regions that ...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/s41594-018-0176-8
更新日期:2019-02-01 00:00:00
abstract::We have isolated a soluble cytochrome from Shewanella oneidensis that contains eight covalently attached heme groups and determined its crystal structure. One of these hemes exhibits novel ligation of the iron atom by the epsilon-amino group of a lysine residue, despite its attachment via a typical CXXCH motif. This h...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb827
更新日期:2004-10-01 00:00:00
abstract::Polycomb repressive complex 2 (PRC2) trimethylates histone H3 at lysine 27 to mark genes for repression. We measured the dynamics of PRC2 binding on recombinant chromatin and free DNA at the single-molecule level using total internal reflection fluorescence (TIRF) microscopy. PRC2 preferentially binds free DNA with mu...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.3488
更新日期:2017-12-01 00:00:00
abstract::STING functions as both an adaptor protein signaling cytoplasmic double-stranded DNA and a direct immunosensor of cyclic diguanylate monophosphate (c-di-GMP). The crystal structures of the C-terminal domain of human STING (STING(CTD)) and its complex with c-di-GMP reveal how STING recognizes c-di-GMP. In response to c...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.2332
更新日期:2012-06-24 00:00:00
abstract::Simultaneous profiling of transcriptome and chromatin accessibility within single cells is a powerful approach to dissect gene regulatory programs in complex tissues. However, current tools are limited by modest throughput. We now describe an ultra high-throughput method, Paired-seq, for parallel analysis of transcrip...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/s41594-019-0323-x
更新日期:2019-11-01 00:00:00
abstract::Immunoglobulin G4 antibodies exhibit unusual properties with important biological consequences. We report the structure of the human full-length IgG4 S228P anti-PD1 antibody pembrolizumab, solved to 2.3-Å resolution. Pembrolizumab is a compact molecule, consistent with the presence of a short hinge region. The Fc doma...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.3129
更新日期:2015-12-01 00:00:00
abstract::Seven-helix membrane proteins represent a challenge for structural biology. Here we report the first NMR structure determination of a detergent-solubilized seven-helix transmembrane (7TM) protein, the phototaxis receptor sensory rhodopsin II (pSRII) from Natronomonas pharaonis, as a proof of principle. The overall qua...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.1807
更新日期:2010-06-01 00:00:00
abstract::Small G proteins have key roles in signal transduction pathways. They are switched from the signaling 'on' to the non-signaling 'off' state when GTPase-activating proteins (GAPs) provide a catalytic residue. The ancient signal recognition particle (SRP)-type GTPases form GTP-dependent homo- and heterodimers and deviat...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.2141
更新日期:2011-11-06 00:00:00
abstract::Advances in structure determination of the bacterial and eukaryotic transcription machinery have led to a marked increase in the understanding of the mechanism of transcription. Models for the specific assembly of the RNA polymerase II transcription machinery at a promoter, conformational changes that occur during ini...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章,评审
doi:10.1038/nsmb763
更新日期:2004-05-01 00:00:00
abstract::The Saccharomyces cerevisiae proteasome comprises a 19-subunit regulatory particle and a 28-subunit core particle. To be degraded, substrates must cross the core particle-regulatory particle interface, a site for complex conformational changes and regulatory events. This interface includes two aligned heteromeric ring...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.2147
更新日期:2011-10-30 00:00:00
abstract::We present the first large-scale identification of lariats-the transient branched introns that are released as a byproduct of pre-mRNA splicing. The locations of the branchpoints in these introns provide insight into the early steps of splicing. From this data set, we have developed a comprehensive model of 3' splice-...
journal_title:Nature structural & molecular biology
pub_type: 杂志文章
doi:10.1038/nsmb.2327
更新日期:2012-06-17 00:00:00