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(Received for publication, April 3, 1996, and in revised form, June 26, 1996)
From the Department of Biochemistry and Cancer Center, University
of Rochester School of Medicine and Dentistry, Rochester, New
York 14642
In eukaryotes, the endonucleolytic activity of
the calf RTH-1 class 5
Volume 271, Number 42,
Issue of October 18, 1996
pp. 25888-25897
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
- to 3
-exo/endonuclease can function without
RNase H1 to remove initiator RNA from Okazaki fragments. Cleavage
requires that the RNA be displaced to form an unannealed
single-stranded 5
-tail or flap structure. On substrates with
RNA-initiated primers, DNA oligomers that competed with the RNA for
template binding simulated strand displacement synthesis from an
upstream Okazaki fragment. This allowed cutting of displaced RNA
segments by RTH-1 nuclease. Requirements for the reaction also were
examined on substrates in which the tail was unannealed because it was
intentionally mispaired. On both types of substrate, the nuclease
slides over the RNA region from the 5
-end and cleaves at the beginning
of the annealed region, irrespective of whether ribo- or
deoxyribonucleotides are at the cleavage site. Presence of a
triphosphate or a 7-methyl 3
G5
ppp5
G cap structure at the 5
-end of
the RNA does not affect cleavage. The previously reported stimulation
of the nuclease by an upstream primer was not always observed,
suggesting that not every site in the downstream Okazaki fragment is
equally susceptible to cleavage during displacement synthesis in
vivo. The biological role of the endonuclease activity of RTH-1
nuclease in Okazaki fragment processing is discussed.
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