Type V-A Spacer Acquisition
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB34159 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:A whole transcriptome study was performed on Sulfolobus islandicus REY15A actively undergoing CRISPR spacer acquisition from the crenarchaeal monocaudavirus STSV2 in rich (TYS) and basal (SCV) media over a 6 day period. Spacer acquisition preceded strong host growth retardation, and changes in viral transcript abundance and virus copy numbers showed significant differences between the two media. Results showed that rich medium favoured CRISPR-Cas immunity generation.
2015-12-06 | E-MTAB-4027 | biostudies-arrayexpress
Project description:MiSeq analysis of spacer acquisition by a Gsu type I-G CRISPR system
| PRJEB41616 | ENA
Project description:Key to CRISPR-Cas adaptive immunity is maintaining an ongoing record of invading nucleic acids that are encountered, a process carried out by the Cas1-Cas2 complex that integrates short segments of foreign genetic material (spacers) into the CRISPR locus. It is hypothesized that Cas1 evolved from casposases, a novel class of transposases. We show here that casposase integration in vitro recapitulates several properties of CRISPR-Cas integrases. The X-ray structure of Methanosarcina mazei casposase bound to DNA representing the product of integration reveals a tetramer with target DNA bound snugly between two dimers in which single-stranded casposon end binding resembles that of spacer 3'-overhangs. The differences between transposase and CRISPR-Cas integrase are largely architectural, and it appears that evolutionary change involved changes in protein-protein interactions to favor Cas2 binding over tetramerization and the separation of Cas1 dimers. This, in turn, led to preferred integration of single spacers over two transposon ends.
2020-02-03 | GSE139037 | GEO
Project description:Casposase structure and the mechanistic link between DNA transposition and spacer acquisition by CRISPR-Cas
| PRJNA578121 | ENA
Project description:Spacer acquisition by Type III CRISPR-Cas system during bacteriophage infection of Thermus thermophilus
| PRJNA631468 | ENA
Project description:V. cholerae A50 has a functional CRISPR-cas system with a conserved boxA sequence. Plasmids harboring protospacers that are perfect targets for each spacer of the array are introduced into wt and boxA mutant V. cholerae. After a period of growth without selection, cells are collected and the protospacer plasmids are sequenced in a high throughput manner.
2020-10-08 | E-MTAB-9631 | biostudies-arrayexpress
Project description:We generated a collection of 13 plasmids, with each plasmid containing a variant of a CRISPR protospacer targeted by spacer 8 of the E. coli CRISPR-I array. We transformed the plasmids as a pool into delta cas3 E. coli cells expressing all other cas genes constitutively. We then transformed these cells with either an empty vector or a plasmid expressing the Cas3 nuclease. DNA surrounding the protospacers was PCR-amplified and sequenced.
2017-08-24 | E-MTAB-5969 | biostudies-arrayexpress
Project description:We generated a collection of 13 plasmids, with each plasmid containing a variant of a CRISPR protospacer targeted by spacer 8 of the E. coli CRISPR-I array. We transformed the plasmids as a pool into delta cas3 E. coli cells expressing all other cas genes constitutively, with FLAG-tagged casA. We then used ChIP to enrich for CasA-bound protospacers. DNA surrounding the protospacers was PCR-amplified from input (pre-immunocrecipitation) and ChIP (post-immunoprecipitation) samples and sequenced.
2017-08-24 | E-MTAB-5972 | biostudies-arrayexpress
Project description:In many bacteria, the ability to modulate biofilm production relies on specific signaling molecules that are either self-produced or made by neighboring microbes within the ecological niche. We analyzed the potential interspecies signaling effect of the Burkholderia diffusible signal factor (BDSF) on Francisella novicida, a model organism for Francisella tularensis, and demon- strated that BDSF both inhibits the formation and causes the dispersion of Francisella biofilm. Specificity was demonstrated for the cis versus the trans form of BDSF. Using transcriptome sequencing, quantitative reverse transcription-PCR, and activity as- says, we found that BDSF altered the expression of many F. novicida genes, including genes involved in biofilm formation, such as chitinases. Using a chitinase inhibitor, the antibiofilm activity of BDSF was also shown to be chitinase dependent. In addition, BDSF caused an increase in RelA expression and increased levels of (p)ppGpp, leading to decreased biofilm production. These results support our observation that exposure of F. novicida to BDSF causes biofilm dispersal. Furthermore, BDSF upregulated the genes involved in iron acquisition (figABCD), increasing siderophore production. Thus, this study provides the first evidence for a potential role and mechanism of diffusible signal factor (DSF) signaling in the genus Francisella and suggests the possibility of interspecies signaling between Francisella and other bacteria. Overall, this study suggests that in response to the interspecies DSF signal, F. novicida can alter its gene expression and regulate its biofilm formation.
2015-08-19 | GSE72142 | GEO