Nuclear sphingomyelin protects RNA from RNase action.

Abstract:

:Chromatin phospholipidic fraction, as previously demonstrated, shows the same localization as RNA inside the nuclei. DNase and RNase treatment of nuclei removed almost totally the DNA, 63% of RNA and caused a 50% loss of phospholipids. The aim of the present investigation is to study the fraction of RNase undigested nuclear RNA and its relationship with the phospholipids still present in the nuclei. Isolated hepatocyte nuclei were treated with Triton X-100 and digested with RNase and DNase. The undigested nuclear material contained proteins (98%) and a small amount of RNA (1.7%), DNA (0.4%) and phospholipids (0.18%). The analysis of phospholipids showed the presence of two components only, namely phosphatidylcholine and sphingomyelin. In the same complex, the activity of sphingomyelin synthase, phosphatidylcholine-dependent phospholipase C and neutral sphingomyelinase has been detected. Treatment of isolated RNA with neutral sphingomyelinase modified the RNA in RNase sensitive RNA, thus suggesting that the SM may represent a bridge between two RNA strands possibly regulating transcription.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Micheli M,Albi E,Leray C,Magni MV

doi

10.1016/s0014-5793(98)00810-2

subject

Has Abstract

pub_date

1998-07-24 00:00:00

pages

443-7

issue

3

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(98)00810-2

journal_volume

431

pub_type

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