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Titolo:
CHARACTERIZATION OF DNA-SYNTHESIS AT A RESTRICTIVE TEMPERATURE IN THETEMPERATURE-SENSITIVE MUTANTS, TSFT5 CELLS, THAT BELONG TO THE COMPLEMENTATION GROUP OF TS85 CELLS CONTAINING A THERMOLABILE UBIQUITIN-ACTIVATING ENZYME E1 - INVOLVEMENT OF THE UBIQUITIN-CONJUGATING SYSTEM IN DNA-REPLICATION
Autore:
MORI M; EKI T; TAKAHASHIKUDO M; HANAOKA F; UI M; ENOMOTO T;
Indirizzi:
UNIV TOKYO,FAC PHARMACEUT SCI,DEPT PHYSIOL CHEM,7-3-1 HONGO,BUNKYO KUTOKYO 113 JAPAN UNIV TOKYO,FAC PHARMACEUT SCI,DEPT PHYSIOL CHEM,7-3-1 HONGO,BUNKYO KUTOKYO 113 JAPAN
Titolo Testata:
The Journal of biological chemistry
fascicolo: 22, volume: 268, anno: 1993,
pagine: 16803 - 16809
SICI:
0021-9258(1993)268:22<16803:CODAAR>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOUSE FM3A CELLS; CHROMOSOME CONDENSATION; HEAT-LABILE; POLYMERASE-ALPHA; PROTEIN LIGASE; X-CHROMOSOME; G2 PHASE; PHOSPHORYLATION; DISAPPEARANCE; PURIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
M. Mori et al., "CHARACTERIZATION OF DNA-SYNTHESIS AT A RESTRICTIVE TEMPERATURE IN THETEMPERATURE-SENSITIVE MUTANTS, TSFT5 CELLS, THAT BELONG TO THE COMPLEMENTATION GROUP OF TS85 CELLS CONTAINING A THERMOLABILE UBIQUITIN-ACTIVATING ENZYME E1 - INVOLVEMENT OF THE UBIQUITIN-CONJUGATING SYSTEM IN DNA-REPLICATION", The Journal of biological chemistry, 268(22), 1993, pp. 16803-16809

Abstract

A temperature-sensitive mutant defective in DNA replication, tsFT5, has been isolated from the mouse mammary carcinoma cell line FM3A. DNA synthesis in tsFT5 cells at a restrictive temperature (39-degrees-C) has been characterized in detail. Incorporation of H-3!-thymidine decreased rapidly after an increase in temperature to 39-degrees-C and theincorporation was less than 20% and 10% of the initial level after 4 and 8 h, respectively. Analysis by DNA fiber autoradiography revealed that the initiation of DNA replication at the origin of the replicons was impaired in tsFT5 cells but that the DNA chain elongation rate of the mutant cells did not decrease at the nonpermissive temperature. tsFT5 cells were confirmed to belong to the complementation group which includes ts85 cells arrested mainly in the G2 phase at the nonpermissive temperature. It has been observed that the amount of ubiquitin-conjugated histone H2A (uH2A) in ts85 cells decreases at the nonpermissivetemperature (Marunouchi, T., Yasuda, H., Matsumoto, Y., and Yamada, M. (1980) Biochem. Biophys. Res. Commun. 95, 126-131). The amount of uH2A in tsFT5 cells also decreased rapidly at 39-degrees-C. This decrease occurred at the same time as or slightly preceding to reduction in DNA synthesis, and the reappearance of uH2A was followed by the restoration of DNA synthesis after the temperature was reduced. A similar temporal relationship between decrease in the amount of uH2A and reduction in DNA synthesis was observed in ts85 cells cultured at 39-degrees-C. However, the rates of the decrease of uH2A and of the reduction in DNA synthesis in ts85 cells were slower than those observed in tsFT5 cells. A comparison of the thermolability of purified ubiquitin-activating enzyme E1s revealed that the E1 from ts85 cells had a thermolability intermediate between those of the E1 from tsFT5 cells and of the wild-type cells. A reduction in the phosphorylation of histone H1 was observed in tsFT5 cells cultured at 39-degrees-C, but the reduction occurred several hours after the decrease in uH2A and the reduction in DNA synthesis.

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Documento generato il 01/10/20 alle ore 16:13:57