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Lagging strand synthesis in coordinated DNA synthesis by bacteriophage t7 replication proteins.

Abstract：

:The proteins of bacteriophage T7 DNA replication mediate coordinated leading and lagging strand synthesis on a minicircle template. A distinguishing feature of the coordinated synthesis is the presence of a replication loop containing double and single-stranded DNA with a combined average length of 2600 nucleotides. Lagging strands consist of multiple Okazaki fragments, with an average length of 3000 nucleotides, suggesting that the replication loop dictates the frequency of initiation of Okazaki fragments. The size of Okazaki fragments is not affected by varying the components (T7 DNA polymerase, gene 4 helicase-primase, gene 2.5 single-stranded DNA binding protein, and rNTPs) of the reaction over a relatively wide range. Changes in the size of Okazaki fragments occurs only when leading and lagging strand synthesis is no longer coordinated. The synthesis of each Okazaki fragment is initiated by the synthesis of an RNA primer by the gene 4 primase at specific recognition sites. In the absence of a primase recognition site on the minicircle template no lagging strand synthesis occurs. The size of the Okazaki fragments is not affected by the number of recognition sites on the template.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Lee J,Chastain PD 2nd,Griffith JD,Richardson CC

doi

10.1006/jmbi.2001.5325

keywords:

subject

Has Abstract

pub_date

2002-02-08 00:00:00

pages

19-34

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022283601953252

journal_volume

316

pub_type

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