Abstract:
:Ribonucleotide reductase activity is essential for progression through the cell cycle, catalyzing the rate-limiting step for the production of deoxyribonucleotides needed for DNA synthesis. The enzymatic activity of the enzyme fluctuates in the cell cycle with an activity maximum in S phase. We have identified and characterized two Saccharomyces cerevisiae genes encoding the regulatory subunit of ribonucleotide reductase, RNR1 and RNR3. They share approximately 80% amino acid identity with each other and 60% with the mammalian homolog, M1. Genetic disruption reveals that the RNR1 gene is essential for mitotic viability, whereas the RNR3 gene is not essential. A high-copy-number clone of RNR3 is able to suppress the lethality of rnr1 mutations. Analysis of mRNA levels in cell-cycle-synchronized cultures reveals that the RNR1 mRNA is tightly cell-cycle regulated, fluctuating 15- to 30-fold, and is coordinately regulated with the POL1 mRNA, being expressed in the late G1 and S phases of the cell cycle. Progression from the alpha-factor-induced G1 block to induction of RNR1 mRNA is blocked by cycloheximide, further defining the requirement for protein synthesis in the G1- to S-phase transition. Both RNR1 and RNR3 transcripts are inducible by treatments that damage DNA, such as 4-nitroquinoline-1-oxide and methylmethanesulfonate, or block DNA replication, such as hydroxyurea. RNR1 is inducible 3- to 5-fold, and RNR3 is inducible greater than 100-fold. When MATa cells are arrested in G1 by alpha-factor, RNR1 and RNR3 mRNA is still inducible by DNA damage, indicating that the observed induction can occur outside of S phase. Inhibition of ribonucleotide reductase activity by hydroxyurea treatment results in arrest of the cell cycle in S phase as large budded, uninucleate cells. This specific cell-cycle arrest is independent of the RAD9 gene, defining a separate pathway for the coordination of DNA synthesis and cell-cycle progression.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Elledge SJ,Davis RWdoi
10.1101/gad.4.5.740subject
Has Abstractpub_date
1990-05-01 00:00:00pages
740-51issue
5eissn
0890-9369issn
1549-5477journal_volume
4pub_type
杂志文章abstract::GRF2, an abundant yeast protein of Mr approximately 127,000, binds to the GAL upstream activating sequence (UASG) and creates a nucleosome-free region of approximately 230 bp. Purified GRF2 binds to sequences found in many other UASs, in the 35S rRNA enhancer, at centromeres, and at telomeres. Although GRF2 stimulates...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.4.4.503
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
pub_type: 杂志文章
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.504808
更新日期:2008-12-01 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.279003
更新日期:2003-12-15 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2004-08-15 00:00:00
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journal_title:Genes & development
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更新日期:2007-12-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.1.7.693
更新日期:1987-09-01 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.256003
更新日期:2003-06-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.823200
更新日期:2000-09-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
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journal_title:Genes & development
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更新日期:2005-07-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
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更新日期:2013-01-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章,评审
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更新日期:2012-03-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.512009
更新日期:2009-05-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.11.18.2438
更新日期:1997-09-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.12.22.3591
更新日期:1998-11-15 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
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更新日期:1997-11-01 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
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更新日期:2008-10-01 00:00:00
abstract::The sigma(28) protein is a member of the bacterial sigma(70)-family of transcription factors that directs RNA polymerase to flagellar late (class 3) promoters. The sigma(28) protein is regulated in response to flagellar assembly by the anti-sigma(28) factor FlgM. FlgM inhibits sigma(28)-dependent transcription of gene...
journal_title:Genes & development
pub_type: 杂志文章
doi:10.1101/gad.380406
更新日期:2006-08-15 00:00:00