Inactivation of the nonessential TOP1 gene, which codes for Saccharomyces cerevisiae DNA topoisomerase I, affects the rate of transcription starting at the ADH2 promoter. For both the chromosomal gene and the plasmid-borne promoter, mRNA accumulation is kinetically favored in the mutant relative to a wild-type isogenic strain. The addition of ethanol causes in wild-type yeast strains a substantial increase in linking number both on the ADH2-containing plasmid and on the resident 2 microns DNA. Evidence has been obtained that such an in vivo increase in linking number depends on (i) the activity of DNA topoisomerase I and of no other enzyme and (ii) ethanol addition, not on the release from glucose repression. A direct cause-effect relationship between the change in supercoiling and alteration of transcription cannot be defined. However, the hypothesis that a metabolism-induced modification of DNA topology in a eukaryotic cell plays a role in regulating gene expression is discussed.

DNA topoisomerase I controls the kinetics of promoter activation and DNA topology in Saccharomyces cerevisiae / DI MAURO, Ernesto; Camilloni, Giorgio; Verdone, Loredana; Caserta, M.. - In: MOLECULAR AND CELLULAR BIOLOGY. - ISSN 0270-7306. - STAMPA. - 13:5(1993), pp. 6479-6489.

DNA topoisomerase I controls the kinetics of promoter activation and DNA topology in Saccharomyces cerevisiae.

DI MAURO, Ernesto;CAMILLONI, Giorgio;VERDONE, Loredana;
1993

Abstract

Inactivation of the nonessential TOP1 gene, which codes for Saccharomyces cerevisiae DNA topoisomerase I, affects the rate of transcription starting at the ADH2 promoter. For both the chromosomal gene and the plasmid-borne promoter, mRNA accumulation is kinetically favored in the mutant relative to a wild-type isogenic strain. The addition of ethanol causes in wild-type yeast strains a substantial increase in linking number both on the ADH2-containing plasmid and on the resident 2 microns DNA. Evidence has been obtained that such an in vivo increase in linking number depends on (i) the activity of DNA topoisomerase I and of no other enzyme and (ii) ethanol addition, not on the release from glucose repression. A direct cause-effect relationship between the change in supercoiling and alteration of transcription cannot be defined. However, the hypothesis that a metabolism-induced modification of DNA topology in a eukaryotic cell plays a role in regulating gene expression is discussed.
01 Pubblicazione su rivista::01a Articolo in rivista
DNA topoisomerase I controls the kinetics of promoter activation and DNA topology in Saccharomyces cerevisiae / DI MAURO, Ernesto; Camilloni, Giorgio; Verdone, Loredana; Caserta, M.. - In: MOLECULAR AND CELLULAR BIOLOGY. - ISSN 0270-7306. - STAMPA. - 13:5(1993), pp. 6479-6489.
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/365568
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 21
  • ???jsp.display-item.citation.isi??? 12
social impact