The proposed work will continue our laboratory's effort to detail the events that occur during the initiation of lagging-strand DNA synthesis and the subsequent maintenance of the priming apparatus on the DNA. Two regions of pBR322 DNA have been shown to act as effector DNAs for the singlestrand DNA-dependent ATPase activity of replication factor Y (Zipursky and Marians, PNAS, 77, 6521-6525 (1980)), a pre-priming E. coli replication protein which directs the assembly of the primosome. We have demonstrated that the factor Y effector sites of pBR322 DNA can act as origins of complementary strand synthesis when cloned into single-strand phage vectors (Zipursky and Marians, PNAS, 78, 6111-6115(1981). The proposed work can be divided into two major sections. We will first study the interaction of factor Y with its effector sites on a molecular level. Through the use of DNA footprinting, methylation enhancement and in vitro mutant construction we will determine precisely those bases within a factor Y effector site which are required for origin function. This work will define the mechanism of interaction between factor Y and its effector DNAs and define the requirements for a region of DNA to function as a lagging-strand origin of replication. The second section of the proposed work is biochemical in nature. Reconstitution of ss(c) greater than RF DNA synthesis with purified proteins using the recombinant Y-site-fl phage DNAs as templates will allow us to determine which proteins are involved, the direction of primosome movement, and the role of the ATP hydrolyzing proteins (factor Y and the dnaB protein) in unwinding duplex DNA during replication.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM034557-04
Application #
3285793
Study Section
Biochemistry Study Section (BIO)
Project Start
1984-07-01
Project End
1987-12-31
Budget Start
1987-01-01
Budget End
1987-12-31
Support Year
4
Fiscal Year
1987
Total Cost
Indirect Cost
Name
Sloan-Kettering Institute for Cancer Research
Department
Type
DUNS #
064931884
City
New York
State
NY
Country
United States
Zip Code
10065
Nevin, Philip; Gabbai, Carolina C; Marians, Kenneth J (2017) Replisome-mediated translesion synthesis by a cellular replicase. J Biol Chem 292:13833-13842
Graham, James E; Marians, Kenneth J; Kowalczykowski, Stephen C (2017) Independent and Stochastic Action of DNA Polymerases in the Replisome. Cell 169:1201-1213.e17
Gupta, Sankalp; Yeeles, Joseph T P; Marians, Kenneth J (2014) Regression of replication forks stalled by leading-strand template damage: II. Regression by RecA is inhibited by SSB. J Biol Chem 289:28388-98
Gabbai, Carolina B; Yeeles, Joseph T P; Marians, Kenneth J (2014) Replisome-mediated translesion synthesis and leading strand template lesion skipping are competing bypass mechanisms. J Biol Chem 289:32811-23
Gupta, Sankalp; Yeeles, Joseph T P; Marians, Kenneth J (2014) Regression of replication forks stalled by leading-strand template damage: I. Both RecG and RuvAB catalyze regression, but RuvC cleaves the holliday junctions formed by RecG preferentially. J Biol Chem 289:28376-87
Gupta, Milind K; Guy, Colin P; Yeeles, Joseph T P et al. (2013) Protein-DNA complexes are the primary sources of replication fork pausing in Escherichia coli. Proc Natl Acad Sci U S A 110:7252-7
Yeeles, Joseph T P; Marians, Kenneth J (2013) Dynamics of leading-strand lesion skipping by the replisome. Mol Cell 52:855-65
Yeeles, Joseph T P; Poli, Jérôme; Marians, Kenneth J et al. (2013) Rescuing stalled or damaged replication forks. Cold Spring Harb Perspect Biol 5:a012815
Marceau, Aimee H; Bahng, Soon; Massoni, Shawn C et al. (2011) Structure of the SSB-DNA polymerase III interface and its role in DNA replication. EMBO J 30:4236-47
Yeeles, Joseph T P; Marians, Kenneth J (2011) The Escherichia coli replisome is inherently DNA damage tolerant. Science 334:235-8

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