These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Effects of magnesium and temperature on the conformation and reassociation of Escherichia coli and Sulfolobus solfataricus ribosomes.
    Author: Pedone F, Bonincontro A, Briganti G, Giansanti A, Londei P, Risuleo G, Mengoni M.
    Journal: Biochim Biophys Acta; 1997 Jun 06; 1335(3):283-9. PubMed ID: 9202191.
    Abstract:
    The structural response of the ribosomes of the extremely thermophilic archaeon Sulfolobus solfataricus was analysed and compared to that of the mesophilic (E. coli) ribosomes by assaying ethidium bromide (EB) binding to the native 70S particles as a function of magnesium concentration. We found that the thermophilic ribosomes bound more EB than their mesophilic counterparts; on the other hand, inhibition of EB binding by Mg2+ ions was more effective in the E. coli 70S particle. In Sulfolobus, the separated 30S and 50S subunits and the 70S particle bound the drug in a similar fashion, whereas the E. coli 70S had a reduced number of binding sites with respect to the subunits. Light scattering measurements as a function of Mg2+ concentration were carried out at various temperatures to study the interaction between the ribosomal subunits from the thermophilic and the mesophilic bacteria. As expected, the association of ribosomal subunits in E. coli was magnesium dependent and could be observed also at low temperature. By contrast, the interaction between Sulfolobus ribosomal subunits was obligatorily dependent upon both magnesium ions and a temperature of at least 80 degrees C, close to the physiological optimum for cell growth (87 degrees C).
    [Abstract] [Full Text] [Related] [New Search]