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      https://www.ias.ac.in/article/fulltext/jbsc/019/02/0183-0192

    • Keywords

       

      DNA maturation; bacteriophage 9NA; fatty acid auxotroph

    • Abstract

       

      The fatty acid composition of the membrane of the conditional auxotroph fabB2 can be altered by allowing the cells to grow at non-permissive temperature (37°C) in the presence of a cis-unsaturated fatty acid. The phage 9NA, a virulent phage ofSalmonella typhimurium, can not multiply in fabB2. Synthesis and maturation of the phage DNA are differentially affected by variation in the fatty acid composition of the cell membrane. The replicating DNA associates with the membrane complex, the site of DNA synthesis. The association is comparatively weak in oleic, claidic, palmitoleic, palmitelaidic and linolelaidic acid enriched cells. When the cells are grown in the presence of palmitoleic acid, a large pool of concatemeric phage DNA accumulates in the cytoplasm within 10 min of infection. The conversion of concatemeric DNA to monomeric one i.e., mature phage length DNA, is inhibited in such cells. The presence of concatemeric DNA can be visualized by electron microscope. Such a situation is not observed when the cells are grown in media supplemented with other types of unsaturated fatty acids. The mechanism by which the host cell membrane lipid controls phage development is yet to be worked out.

    • Author Affiliations

       

      Ruby Goyal1 Grace Sasane1 Sabita Majumdar1 2 Maharani Chakravorty1

      1. Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi - 221 005, India
      2. Biophysics Division, Indian Institute of Chemical Biology, 4, Raja S C Mullick Road, Calcutta - 700 032, India
    • Dates

       
  • Journal of Biosciences | News

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