Abstract:
:dCMP-deaminase-deficient V79/dC hamster cells have highly imbalanced deoxyribonucleoside triphosphate (dNTP) pools, i.e. a 17-fold larger dCTP pool, a slightly reduced dTTP and a very low dGTP pool, compared to dCMP-deaminase-proficient V79/p cells. Nevertheless, the two lines showed the same rates of spontaneous mutation at the hprt and ouabain-resistance loci. Analysis of spontaneous hprt mutations indicated an increase in misincorporation of C in V79/dC cells, although it was not statistically significant. When the dCTP pool was further increased fivefold by incubating V79/dC cells with cytidine, C misincorporation increased to 88%, but the mutation frequency remained unchanged. The dNTP pools of V79/dC cells were also altered by treatment with thymidine, or with thymidine plus deoxycytidine. After incubation with thymidine alone, the dCTP pool all but disappeared, whereas it maintained a normal level in the presence of deoxycytidine. In both cases dTTP rose to nmol amounts, and dGTP accumulated. Incubation with 10 mM thymidine was the only treatment that increased the mutation frequency; T misincorporation then accounted for 94% of the base substitutions. In the presence of deoxycytidine the cells had a dTTP/dCTP ratio of 0.04, but 86% of the base substitutions involved C misincorporation and most probably originated from G mis-incorporation caused by excess dGTP. Alterations of RNA splicing and hot spots for base substitutions varied with the imbalance, the latter showed "next-nucleotide effects". Our results suggest that the fidelity of DNA replication in V79 cells is only affected by large changes in the pool and is more sensitive to changes in dGTP than in dCTP or dTTP.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Darè E,Zhang LH,Jenssen D,Bianchi Vdoi
10.1006/jmbi.1995.0516subject
Has Abstractpub_date
1995-10-06 00:00:00pages
514-21issue
5eissn
0022-2836issn
1089-8638pii
S0022283685705165journal_volume
252pub_type
杂志文章abstract::Carbohydrate-binding polypeptides, including carbohydrate-binding modules (CBMs) from polysaccharidases, and lectins, are widespread in nature. Whilst CBMs are classically considered distinct from lectins, in that they are found appended to polysaccharide-degrading enzymes, this distinction is blurring. The crystal st...
journal_title:Journal of molecular biology
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1006/jmbi.2000.3886
更新日期:2000-07-21 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:1998-05-29 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:1988-05-05 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:2008-03-21 00:00:00
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更新日期:1988-08-05 00:00:00
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journal_title:Journal of molecular biology
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更新日期:1987-12-05 00:00:00
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journal_title:Journal of molecular biology
pub_type: 杂志文章
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更新日期:1994-09-02 00:00:00
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