Abstract:
:Slime mold, plant and insect dihydropyrimidine amidohydrolases (DHPases, EC 3.5.2.2), which catalyze the second step of pyrimidine and several anti-cancer drug degradations, were cloned and shown to functionally replace a defective DHPase enzyme in the yeast Saccharomyces kluyveri. The yeast and slime mold DHPases were over-expressed, shown to contain two zinc ions, characterized for their properties and compared to those of the calf liver enzyme. In general, the kinetic parameters varied widely among the enzymes, the mammalian DHPase having the highest catalytic efficiency. The ring opening was catalyzed most efficiently at pH 8.0 and competitively inhibited by the reaction product, N-carbamyl-beta-alanine. At lower pH values DHPases catalyzed the reverse reaction, the closing of the ring. Apparently, eukaryote DHPases are enzymatically as well as phylogenetically related to the de novo biosynthetic dihydroorotase (DHOase) enzymes. Modeling studies showed that the position of the catalytically critical amino acid residues of bacterial DHOases and eukaryote DHPases overlap. Therefore, only a few modifications might have been necessary during evolution to convert the unspecialized enzyme into anabolic and catabolic ones.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Gojkovic Z,Rislund L,Andersen B,Sandrini MP,Cook PF,Schnackerz KD,Piskur Jdoi
10.1093/nar/gkg258keywords:
subject
Has Abstractpub_date
2003-03-15 00:00:00pages
1683-92issue
6eissn
0305-1048issn
1362-4962journal_volume
31pub_type
杂志文章abstract::Two analog uridine triphosphates tethering additional functionality, one a primary amino group and the second a mercapto group, were prepared and tested for their compatibility with in vitro RNA selection procedures. 5-(3-Aminopropyl)uridine triphosphate (UNH(2)) as a uridine substitute was a more effective substrate ...
journal_title:Nucleic acids research
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更新日期:2017-05-19 00:00:00
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更新日期:1993-12-11 00:00:00
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更新日期:1979-04-01 00:00:00
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journal_title:Nucleic acids research
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更新日期:2005-07-01 00:00:00
abstract::Replacement of alpha-, beta- and gamma-phosphate groups in 2'-deoxynucleoside 5'-triphosphates (dNTP) with phosphonate groups yields a new set of dNTP mimics with potential biological and therapeutic applications. Here, we describe the synthesis of 15 new dNTPs modified at alpha-, beta- and gamma-phosphates containing...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:1998-02-01 00:00:00
abstract::Meiotic cells possess surveillance mechanisms that monitor critical events such as recombination and chromosome synapsis. Meiotic defects resulting from the absence of the synaptonemal complex component Zip1 activate a meiosis-specific checkpoint network resulting in delayed or arrested meiotic progression. Pch2 is an...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkw506
更新日期:2016-09-19 00:00:00
abstract::A sensitive gel retention assay has been utilized to detect proteins from uninfected Hela nuclei which interact with the adenovirus type 2 enhancer. This assay has been employed to monitor fractionation of nuclear extracts. Three enhancer binding factors were resolved by chromatography on DEAE-Sepharose and one of the...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/15.6.2719
更新日期:1987-03-25 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:1991-06-11 00:00:00
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journal_title:Nucleic acids research
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更新日期:1996-09-15 00:00:00
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journal_title:Nucleic acids research
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更新日期:2005-10-24 00:00:00
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journal_title:Nucleic acids research
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更新日期:1998-05-15 00:00:00
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journal_title:Nucleic acids research
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更新日期:1987-07-24 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2010-04-01 00:00:00
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journal_title:Nucleic acids research
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更新日期:1980-03-11 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章,评审
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更新日期:2006-01-01 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/12.13.5429
更新日期:1984-07-11 00:00:00
abstract::The nucleotide sequence of the Anacystis nidulans 23S rRNA gene, including the 5'- and 3'-flanking regions has been determined. The gene is 2876 nucleotides long and shows higher primary sequence homology to the 23S rRNAs of plastids (84.5%) than to that of E. coli (79%). The predicted rRNA transcript also shares many...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/12.7.3373
更新日期:1984-04-11 00:00:00