منابع مشابه
Okazaki Fragment Maturation in Yeast
In the presence of proliferating cell nuclear antigen, yeast DNA polymerase (Pol ) replicated DNA at a rate of 40–60 nt/s. When downstream double-stranded DNA was encountered, Pol paused, but most replication complexes proceeded to carry out strand-displacement synthesis at a rate of 1.5 nt/s. In the presence of the flap endonuclease FEN1 (Rad27), the complex carried out nick translation (1.7 n...
متن کاملJunction ribonuclease: an activity in Okazaki fragment processing.
The initiator RNAs of mammalian Okazaki fragments are thought to be removed by RNase HI and the 5'-3' flap endonuclease (FEN1). Earlier evidence indicated that the cleavage site of RNase HI is 5' of the last ribonucleotide at the RNA-DNA junction on an Okazaki substrate. In current work, highly purified calf RNase HI makes this exact cleavage in Okazaki fragments containing mismatches that dist...
متن کاملFlap endonuclease disengages Dna2 helicase/nuclease from Okazaki fragment flaps.
Okazaki fragments contain an initiator RNA/DNA primer that must be removed before the fragments are joined. In eukaryotes, the primer region is raised into a flap by the strand displacement activity of DNA polymerase delta. The Dna2 helicase/nuclease and then flap endonuclease 1 (FEN1) are proposed to act sequentially in flap removal. Dna2 and FEN1 both employ a tracking mechanism to enter the ...
متن کاملCrystal structure of an Okazaki fragment at 2-A resolution.
In DNA replication, Okazaki fragments are formed as double-stranded intermediates during synthesis of the lagging strand. They are composed of the growing DNA strand primed by RNA and the template strand. The DNA oligonucleotide d(GGGTATACGC) and the chimeric RNA-DNA oligonucleotide r(GCG)d(TATACCC) were combined to form a synthetic Okazaki fragment and its three-dimensional structure was deter...
متن کاملCytarabine-induced destabilization of a model Okazaki fragment.
Cytarabine is a potent anticancer drug that interferes with elongation of the lagging strand at the replication fork during DNA synthesis. The effects of cytarabine substitution on the structural and thermodynamic properties of a model Okazaki fragment were investigated using UV hyperchromicity and 1H NMR spectroscopy to determine how cytarabine alters the physicochemical properties of Okazaki ...
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ژورنال
عنوان ژورنال: Cold Spring Harbor Perspectives in Biology
سال: 2013
ISSN: 1943-0264
DOI: 10.1101/cshperspect.a010173