Nucleic Acids Research, 1975, Vol. 2, No. 7 1005-1022
© 1975
Articles |
The binding of polyamines and of ethidium bromide to tRNA
Department of Microbiology, University of Colorado Medical Center Denver, Colorado 80220 *Department of Therapeutic Research, University of Pennsylvania School of Medicine Philadelphia, Pennsylvania, USA
Received March 19, 1975. The binding of spermidine and ethidium bromide to mixed tPNA and phenylalanine tRNA has been studied under equilibrium conditions. The numbers and classes of binding sites obtained have been compared to those found in complexes isolated by gel filtration a low ionic strength. The latter complexes contain 10–11 moles of either spermidine or ethidium per mole of tRNA; either cation is completely displaceable by the other. In ethidium complexes, the first 2–3 moles are bound in fluorescent binding sites; the remaining 7–8 molecules bind in non-fluorescent form. At least one of the binding sites for spermidine appears similar to a binding site for fluorescent ethidium. Similar results are found with E. coli formylmethionine tRNA. Spermine, in excess of 18–20 moles per mole tRNA, causes precipitation of the complex. Putrescine does not form isolable complexes with yeast tRNA and displaces ethidium less readily from preformed ethidium-tRNA complexes.
Under equilibrium conditions, in the absence of Mg++, there are 16–17 moles of spermidine bound per mole of tRNA as determined by equilibrium dialysis. Of these, 2-3 bind with a K2=6.6 x 104 M–1; the rest bind with a Ka = 7.6 x 103 M–1. In the presence of 9 mM. Mg–, the total number of binding sites is decreased slightly and there appears to be only one class of sites with a Ka = 600 M–1. Quantitatively similar results are obtained for the binding of spermidine to yeast phenylalanine tRNA. When the interaction between ethidium bromide and mixed tRNA is studied by equilibrium dialysis or spectrophotometric titration, two classes of binding sites are obtained: 2–3 molecules bind with an average Ka = 6.6 x 105 M–1 and 14-15 molecules bind with an average Ka = 4.1 x 104 M–1. Spermidine, spermine, and Mg++ compete effectively for both classes of ethidium sites and have the effect of reducing the apparent binding constants for ethidium. When the binding of ethidiun is studied by fluorometry, there are 3–4 highly fluorescent sites per tRNA. These sites are also affected by spermidine, spermine and Mg++. Putrescine has little effect on any of the classes of binding sites. These data are consistent with those found under non-equilibrium conditions. They suggest that polyamines bind to fairly snecific regions of tRNA and may be involved in the maintenance of certain structural features of tPHA.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  C. Bacchi, H. Nathan, S. Hutner, P. McCann, and A Sjoerdsma Polyamine metabolism: a potential therapeutic target in trypanosomes Science, October 17, 1980; 210(4467): 332 - 334. [Abstract] [PDF]
|
|