Mitochondrial rRNA-containing petite strains of yeast (Saccharomyces cerevisiae) show a normal nuclear-mitochondrial stringent response.

Abstract:

:The nuclear-mitochondrial stringent response was examined in isonuclear rho+, 21S rRNA-containing rho-, and rho o strains of S. cerevisiae. By 30 min after nutritional downshift, nuclear rDNA transcription falls to 15% of control levels congruently in all strains, as assayed via whole-cell RNA or by hybrid selection of specific double-labeled transcripts. Both in vivo and in vitro, the mitochondrial stringent response is identical between the rho- strain and its parental rho+ strain, and in both, the kinetics and magnitude of the organellar response mirror those of the nuclear response. The data show that mitochondrial transcription and protein synthesis are not required for stringent regulation of either nuclear or mitochondrial rDNA transcription.

authors

McEntee CM,Cantwell R,Thomas LC,Hudson AP

doi

10.1016/0006-291x(89)91727-0

subject

Has Abstract

pub_date

1989-10-16 00:00:00

pages

362-9

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(89)91727-0

journal_volume

164

pub_type

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