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    • Extracellular polypeptides ofAnabaena L-31: Evidence for their role in regulation of heterocyst formation

      K A V David Joseph Thomas

      Volume 1 Issue 4 December 1979 pp 447-455

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jbsc/001/04/0447-0455

    • Keywords

       

      Anabaena L-31; blue-green algae; heterocyst differentiation; extracellular peptides; heterocyst regulation

    • Abstract

       

      Extracellular polypeptides released by both N2-grown [peptide I] and NO3-grown [peptide II]Anabaena L-31 have molecular weight of approximately 3,500 but have distinctly different amino acid composition. Acid hydrolysis of the peptide I fraction (obtained by separation on Sephadex G-25) yielded ten amino acids whereas that from peptide II fraction yielded only 3 amino acids. On addition to a freshly inoculated N2-grown culture, the peptide I fraction stimulated pro-heterocyst and to a lesser extent heterocyst differentiation, whereas the peptide II fraction strongly inhibited differentiation. The inhibitory effect of polypeptide II fraction could not be relieved by methionine sulphoximine, which by itself enhances differentiation, but was greatly relieved by addition of the peptide I fraction. The data suggest but does not prove, thatAnabaena L-31 synthesises “inducer” or “inhibitor” peptides which could possibly control pattern formation.

    • Author Affiliations

       

      K A V David1 Joseph Thomas1

      1. Biology and Agriculture Division, Bhabha Atomic Research Centre, Trombay, Bombay - 400 085

    • Dates

       
      Published
      December 1979
      Manuscript received
      12 October 1978
      Manuscript revised
      5 September 1979

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      Plant mitochondria are quite distinct and have unique features, such as a cyanide-insensitive alternate pathway. They also interact with chloroplasts to optimize photosynthetic carbon assimilation.


      Submissions are welcome until 30 July 2023. The contributions can be original articles, short communications, reviews, or mini-reviews on any topic related to plant mitochondria.


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