title: [Effect of Ca2+, Mg2+-dependent deoxyribonuclease on DNA synthesis in cell nuclei from embryos of the sea urchin Strongylocentrotus intermedius].
abstract: The sea urchin embryo nuclei which retained their ability to maintain the DNA synthesis in an in vitro system were isolated. The DNA synthesis isolated nuclei was shown to be an ATP-dependent process which is inhibited by low concentrations of actinomycin D, a polymerase alpha araCTP inhibitor. The newly synthesized DNA is represented by short fragments of about 4S. After addition of Ca2+, Mg2+-dependent DNAase to sea urchin embryo nuclei, the synthesis of short DNA fragments is enhanced. This stimulating effect of Ca2+, Mg2+-dependent DNAase is ATP-dependent and is observed only within a narrow range of enzyme concentrations (of the order of 1-5 units of DNAase activity per ml of incubation sample). The increase in the enzyme concentration to 10 or more units of activity results in the depression of DNA synthesis. It is concluded that DNA replication in sea urchin embryo nuclei depends on the presence of active DNAases as well as on the number of accessible initiation sites of DNA replication.
authors.forename: V G
authors.initials: VG
authors.lastname: Vinter
authors.forename: N G
authors.initials: NG
authors.lastname: Khamidullina
authors.forename: Z I
authors.initials: ZI
authors.lastname: Abramova
authors.forename: Iu N
authors.initials: IuN
authors.lastname: Shumilov
authors.forename: V A
authors.initials: VA
authors.lastname: Rasskazov
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D004247:DNA / Q000096:biosynthesis*; D004261:DNA Replication; D004706:Endodeoxyribonucleases / Q000378:metabolism*; D010063:Ovum / Q000201:enzymology / Q000378:metabolism*; D012617:Sea Urchins / Q000201:enzymology / Q000378:metabolism*
chemical_list: D000255:Adenosine Triphosphate; D004247:DNA; D004706:Endodeoxyribonucleases; C029367:calcium magnesium dependent endodeoxyribonuclease
vernacular_title: Vliianie Ca2+, Mg2+-zavisimoĭ dezoksiribonukleazy na sintez DNK v iadrakh émbrionov morskogo ezha Strongylocentrotus intermedius.