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Reference: Nazar RN (1978) The release and reassociation of 5.8 S rRNA with yeast ribosomes. J Biol Chem 253(13):4505-7

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Abstract

Yeast 5.8 S rRNA is released from purified 26 S rRNA when it is dissolved in water or low salt buffer (50 mM KCl, 10mM Tris-HCl, pH 7.5); it is not released from 60 S ribosomal subunits under similar conditions. The 5.8 S RNA component together with 5 S rRNA can be released from subunits or whole ribosomes by brief heat treatment or in 50% formamide; the Tm for the heat dissociation of 5.8 S RNA is 47 degrees C. This Tm is only slightly lower when 5 S rRNA is released first with EDTA treatment prior to heat treatment. No ribosomal proteins are released by the brief heat treatment. A significant portion of the 5.8 S RNA reassociates with the 60 S subunit when suspended in a higher salt buffer (e.g.0.4 m KCl, 25 mM Tris-HCl, pH 7.5, 6 mM magnesium acetate, 5 mM beta-mercaptoethanol). The Tm of this reassociated complex is also 47 degrees C. The results indicate that in yeast ribosomes the 5.8 S-26 S rRNA interaction is stabilized by ribosomal proteins but that the association is sufficiently loose to permit a reversible dissociation of the 5.8 S rRNA molecule.FAU - Nazar, R .

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Nazar RN
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