, Volume 69, Issue 3, pp 281–286 | Cite as

Dynamics of serine/threonine protein kinase activity during the growth of the wild-typeStreptomyces avermitilis strain and its chloramphenicol-resistant mutant

  • S. M. Elizarov
  • V. A. Mironov
  • V. N. Danilenko
Experimental Articles


The dynamics of serine/threonine protein kinase activity during the growth of the wild-typeStreptomyces avermitilis strain 964 and its chloramphenicol-resistant (Cmlr) pleiotropic mutant with an enhanced production of avermectins was studied by measuring the transfer of radiolabeled phosphate from [y-32P]ATP to the serine and threonine residues of proteins in cell-free extracts. In both of the strains studied, radiolabeled phosphate was found to incorporate into polypeptides with molecular masses of 32, 35, 41, 68, 75, 79, 83, and 137 kDa; however, the degree and the dynamics of phosphorylation of particular peptides were different in these strains. The differences revealed could not be accounted for by the interference of ATPases or phosphoprotein phosphatases. The data obtained may be interpreted as evidence that Cmlr mutation activates the protein kinase signalling system ofS.avermitilis cells in the early stationary growth phase and thus enhances the production of avermectins and leads to some other physiological changes in the mutant strain.

Key words

phosphorylation of proteins serine/threonine protein kinase streptomycetes chloramphenicol resistance avermectin 


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Copyright information

© MAIK “Nauka/Interperiodica” 2000

Authors and Affiliations

  • S. M. Elizarov
    • 1
  • V. A. Mironov
    • 2
  • V. N. Danilenko
    • 2
  1. 1.Russian Academy of SciencesBach Institute of BiochemistryMoscowRussia
  2. 2.All-Russia Research Institute of Biosynthesis of Protein SubstancesMoscowRussia

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