Project description:SMC complexes, loaded at ParB-parS sites, are key mediators of chromosome organization in bacteria. ParA/Soj proteins interact with ParB/Spo0J in a pathway involving ATP-dependent dimerization and DNA binding, leading to chromosome segregation and SMC loading. In Bacillus subtilis, ParA/Soj also regulates DNA replication initiation, and along with ParB/Spo0J is involved in cell cycle changes during endospore formation. The first morphological stage in sporulation is the formation of an elongated chromosome structure called an axial filament. We now show that a major redistribution of SMC complexes drives axial filament formation, in a process regulated by ParA/Soj. Unexpectedly, this regulation is dependent on monomeric forms of ParA/Soj that cannot bind DNA or hydrolyse ATP. These results reveal a new role for ParA/Soj proteins in the regulation of SMC dynamics in bacteria, and yet further complexity in the web of interactions involving chromosome replication, segregation, and organization, controlled by ParAB and SMC.
Project description:In the majority of bacterial species, the tripartite ParAB-parS system, composed of an ATPase (ParA), a DNA-binding protein (ParB), and its target parS sequence(s), assists in the chromosome partitioning. ParB forms large nucleoprotein complexes at parS(s), located in the vicinity of oriC, which after replication are subsequently relocated by ParA to polar positions. It was shown that ParB-parS complexes are loading platforms for structural maintenance of chromosome (Smc) proteins, which juxtapose the two arms of the circular chromosome. In this work, we characterized the Pseudomonas aeruginosa ParB interactions with DNA in the absence of Smc and interaction with the cognate ParA using chromatin immunoprecipitation-sequencing (ChIPseq). We show that in strains lacking Smc or strains with disturbed ParB-ParA interactions (ParA L84K or ParB G11A mutations) ParB is able to bind and spread around parS1-4 cluster and still binds to half-parS sites. Comparison of the ratio between the number of ChIP-seq reads mapping to region around parS1-4 with those mapping to ChIPseq peaks containing half-parSs indicate no major effect of the twod factors on the extent of ParB spreading, thus suggesting that the mechanisms controlling ParB association with the DNA do not involve interaction with cognate ParA partner and Smc.
Project description:The miRNA expression profiles in one pair of hTERT-positive gastric cancer tissue and an hTERT-negative para-cancerous tissue. The para-cancerous tissue is at least 5cm away from the cancer tisse. The expression of hTERT of identified by immunohistochemistry before RNA extraction for miRNA assay.
Project description:Comparisonof ParA levels in E. coli carrying mini-F plasmids (ParA expressed from the native ParA promoter) with ParA-GFP levels expressed froma weak Ptrc promoter in pDSW210 vector.
Project description:Primary objectives: Evaluar la eficacia de Cabazitaxel en pacientes con cáncer colorrectal metastásico resistente al tratamiento estándar.
Primary endpoints: Evaluar la eficacia de Cabazitaxel mediante la estimación de la tasa de respuesta global (ORR), entendida como el porcentaje de individuos que alcanzan una respuesta tumoral completa (CR) o una respuesta tumoral parcial (PR) en cada brazo y a su vez comparándolos entre sí. Se llevarán a cabo evaluaciones del tumor hasta progresión o abandono del estudio. Para ello se utilizarán los criterios RECIST 1.1 cada 8 semanas.
| 2529387 | ecrin-mdr-crc
Project description:Bioprospección de suelos de cultivos autóctonos en el Páramo ecuatoriano para la identificación de microorganismos de interés agrícola útiles para el desarrollo de biofertilizantes
Project description:The miRNA expression profiles in one pair of hTERT-positive gastric cancer tissue and an hTERT-negative para-cancerous tissue. The para-cancerous tissue is at least 5cm away from the cancer tisse. The expression of hTERT of identified by immunohistochemistry before RNA extraction for miRNA assay. One pair of gastric cancer tissue and para-cancerous tissue(Control). Four replicates per array.
