Comparative calorimetric studies on the dynamic conformation of plant 5S rRNA. I. Thermal unfolding pattern of lupin seeds and wheat germ 5S rRNAs, also in the presence of magnesium and sperminium cations.

Abstract:

:An attempt has been made to correlate differential scanning calorimetry melting profiles of 5S rRNAs from lupin seeds (L.s.) and wheat germ (W.g.) with their structure. It is suggested that the observed differences in thermal unfolding are due to differences in RNA nucleotide sequence and as a consequence in higher order structures. Interesting effects induced by magnesium cation, perprotonated and permethylated sperminium tetracations are discussed. It is suggested that the difference in the stabilizing effect of the three cations results from different mode of their interactions with RNA. "Pure" electrostatic interactions expected for permethylated tetracations are rather weak due to the steric hindrance around each positively charged nitrogen atom. Electrostatic interactions of the other two cations are significantly enhanced by coordination bonding for magnesium and by hydrogen bonding for protonated sperminium cation.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Barciszewski J,Bratek-Wiewiórowska MD,Górnicki P,Naskret-Barciszewska M,Wiewiórowski M,Zielenkiewicz A,Zielenkiewicz W

doi

10.1093/nar/16.2.685

subject

Has Abstract

pub_date

1988-01-25 00:00:00

pages

685-701

issue

2

eissn

0305-1048

issn

1362-4962

journal_volume

16

pub_type

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