Role of the cytoplasmic membrane in the synthesis of ribonucleic acid by disrupted spheroplasts of Pseudomonas schuylkilliensis.

Abstract:

:Disrupted spheroplast preparations of Pseudomonas schuylkilliensis strain P contained fragments of cytoplasmic membrane and approximately 82% of the total cellular phospholipid. The protoplast-bursting factor (PB-factor), partially purified from pig pancreas, and a heat-treated pancreatic lipase fraction both inhibited ribonucleic acid (RNA) synthesis by disrupted spheroplasts but did not inhibit or only slightly inhibited RNA synthesis by intact cells or intact spheroplasts. The PB-factor preparation and the heat-treated pancreatic lipase fraction catalyzed partial (15 to 50%) deacylation of diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine in disrupted spheroplasts but not in intact spheroplasts. Phospholipase A activity was demonstrated in the PB-factor preparation by use of isolated phospholipids as substrates. Treatment of disrupted spheroplasts with the PB-factor preparation caused a 70% inhibition in oxidative phosphorylation and RNA synthesis, but had little effect on electron transport. Addition of adenosine-5'-triphosphate or adenosine-5'-diphosphate and a mixture of ribonucleosides after treatment with the PB-factor preparation partially restored oxidative phosphorylation but did not relieve the inhibition in RNA synthesis. The most reasonable explanation for the latter observation appears to be that the concentrations of newly synthesized nucleotides retained by the preparations with partially deacylated membrane phospholipids were insufficient to permit the synthesis of RNA.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Mizuno S,Maruo B

doi

10.1128/JB.109.1.218-228.1972

subject

Has Abstract

pub_date

1972-01-01 00:00:00

pages

218-28

issue

1

eissn

0021-9193

issn

1098-5530

journal_volume

109

pub_type

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