24 Matching Annotations
  1. Oct 2023
    1. sRNAs that repress transcription have been engineered to create orthogonal and composable regulators that can be used to construct RNA-only transcriptional networks
  2. Dec 2022
    1. Diagram of immunoprecipitation (IP) using either pre-immobilized or free antibodies.

      Immunoprecipitation is a technique for the isolation of protein or a complex (protein-protein interactions) Sample is combined with a specific antibody for the epitope of interest. The antibody-protein complex is removed and analysed.

      1. Molecules from biological sample (lysed) +incubated with antibodies (free or mounted onto support (like agarose bead, magnetic bead))
      2. protein A or G coupled beads added.
      3. Centrifuged
      4. Results in Beads with protein A/G bound to antibody-POI complex.
      5. Well separated in this way, differentially based on sedimentation coefficient.

      Co-immunoprecipitation (can isolate one type of protein in its complex)

      Isolate POI(s) Good with low conc. of POI Protein interactions Unknown proteins Determine if protein is actually being expressed in a given tissue.

      Western blot is carried out to analyse the output.

      Vary salt and detergent levels to preserve or destroy protein interactions.

  3. Apr 2022
    1. GenExpDB is the world’s largest repository for E. coli gene expression data. This site is a widely used public resource for gene expression analysis.
  4. May 2021
    1. The basal level of T7-dependent tran-scription in this strain can be reduced by constitutive produc-tion of T7 lyzozyme, a natural inhibitor of T7 RNAP, usingplasmids pLysS and pLysE

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  5. Nov 2020
  6. Sep 2020
    1. genetic devices have been designed for suppressing leaky basal expression levels through the engineering of super‐repressors (Ruegg et al, 2018), exploitation of antisense RNAs (O'Connor & Timmis, 1987), or physical decoupling of regulatory elements along with conditional proteolysis
  7. Feb 2020
    1. Consequently, the plasmid donor cells do not express gfp

      Does the leaky expression not hinder the detecting and quantification of transconjugants in epifluorescence microscopy?

  8. Oct 2019
    1. We have demonstrated that small RNAs can tightly repress their target genes when their synthesis rate is smaller than some threshold, but have little or no effect when the synthesis rate is much larger than that threshold
    1. In particular, small RNAs are shown to establish a threshold for the expression of their target, providing safety mechanism against random fluctuations and transient signals. The threshold level is set by the transcription rate of the small RNA and can thus be modulated dynamically to reflect changing environmental conditions.
    1. in the absence of tamoxifen, it exhibits some activity
    2. strong promoters capable of driving expression of microbial opsins or fluorescent proteins in specific populations can exhibit leaky expression elsewhere. This low-level leak may be virtually undetectable as light responsiveness or fluorescence but can be a serious issue when expressing Cre recombinase.
    1. We report the construction of a family of vectors that contain a reengineered lacIq-lac promoter-operator complex in which cloned genes are strongly repressed in the absence of inducer.
  9. Aug 2019
  10. Jul 2019
  11. Oct 2018
  12. Jul 2018
    1. repeat expansion at IIL1 leads to increased accumulation of 24-nt siRNAs in a temperature-dependent manner that correlates with the iil phenotype. We show that DCL3 and other components of the RNA-dependent DNA methylation (RdDM) pathway are essential for this siRNA-directed epigenetic gene silencing
  13. Nov 2017
  14. Sep 2017
  15. Jul 2017