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  • Article
    Chirino B, Strahsburger E, Agulló L, González M, Seeger M.
    PLoS One. 2013;8(10):e75746.
    2-aminophenol (2-AP) is a toxic nitrogen-containing aromatic pollutant. Burkholderia xenovorans LB400 possess an amn gene cluster that encodes the 2-AP catabolic pathway. In this report, the functionality of the 2-aminophenol pathway of B. xenovorans strain LB400 was analyzed. The amnRJBACDFEHG cluster located at chromosome 1 encodes the enzymes for the degradation of 2-aminophenol. The absence of habA and habB genes in LB400 genome correlates with its no growth on nitrobenzene. RT-PCR analyses in strain LB400 showed the co-expression of amnJB, amnBAC, amnACD, amnDFE and amnEHG genes, suggesting that the amn cluster is an operon. RT-qPCR showed that the amnB gene expression was highly induced by 2-AP, whereas a basal constitutive expression was observed in glucose, indicating that these amn genes are regulated. We propose that the predicted MarR-type transcriptional regulator encoded by the amnR gene acts as repressor of the amn gene cluster using a MarR-type regulatory binding sequence. This report showed that LB400 resting cells degrade completely 2-AP. The amn gene cluster from strain LB400 is highly identical to the amn gene cluster from P. knackmussi strain B13, which could not grow on 2-AP. However, we demonstrate that B. xenovorans LB400 is able to grow using 2-AP as sole nitrogen source and glucose as sole carbon source. An amnBA (-) mutant of strain LB400 was unable to grow with 2-AP as nitrogen source and glucose as carbon source and to degrade 2-AP. This study showed that during LB400 growth on 2-AP this substrate was partially converted into picolinic acid (PA), a well-known antibiotic. The addition of PA at lag or mid-exponential phase inhibited LB400 growth. The MIC of PA for strain LB400 is 2 mM. Overall, these results demonstrate that B. xenovorans strain LB400 posses a functional 2-AP catabolic central pathway, which could lead to the production of picolinic acid.
    Digital Access Access Options
  • Book
    edited by Kirill A. Afonin, Morgan Chandler.
    Summary: This collection of research articles and reviews covers the latest work in the design, delivery, dynamic abilities, and immune stimulation of RNA nanoparticles which have driven the utilization of their immunomodulatory properties. The unknown immune properties of nucleic acid nanoparticles have been a major hurdle in their adaptation until the works herein began assessing their structure-activity relationships. This collection chronologically follows the path of investigating the recognition of design components to implementing them into nucleic acid nanostructures. RNA nanotechnology is an emerging platform for therapeutics with increasing clinical relevance as this approach becomes more widely used and approved for the treatment of various diseases. The latest research aims to take advantage of RNA's modular nature for the design of nanostructures which can interact with their environments to communicate programmed messages with intracellular pathways. In doing so, nanoparticles can be used to elicit or elude responses by the immune system as desired in conjunction with their therapeutic applications.
    Digital Access TandFonline 2021