Partial melting of the segment around pseudouridine in yeast 5S RNA.

Abstract:

:Pseudouridine in yeast 5S RNA was modified with 4-bromomethyl-7-methoxy-coumarin(BMC). Temperature dependence of fluorescence intensity was measured at various concentrations of Mg2+ and K+ cations. Hyperchromicity was also measured. At 100mM KCl and 10mM Mg2+, fluorescence intensity decreased with temperature as free BMC except a plateau at 45 degrees C. Withdrawal of Mg2+ from the buffer resulted in a large quenching at 20 degrees C and showed a gradual increase of fluorescence intensity with temperature, indicating a partial melting of the segment around pseudouridine. The temperature range agrees with the low melting temperature shown by hyperchromicity. In 10 mM KCl solution, the effects are more exaggerated.

authors

Nagamatsu K,Miyazawa Y

doi

10.1016/0006-291x(83)91596-6

subject

Has Abstract

pub_date

1983-07-18 00:00:00

pages

81-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(83)91596-6

journal_volume

114

pub_type

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