Fork Protection Complex
Fork Protection Complex - Related Videos
02:37
Restarting Stalled Replication Forks
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2020
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
01:02
The DNA Replication Fork
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2020
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
01:02
The DNA Replication Fork
0 Views •
2023
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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Cited by 10 •
2010
The fate of the replisome following a collision with a head-on RNA polymerase (RNAP) is unknown. We find that the replisome stalls upon collision with a head-on RNAP, but resumes elongation after displacing the RNAP from DNA. Mfd promotes replication restart by facilitating displacement of the RNAP after the collision.
06:44
Hydrolysis of a Ni-Schiff-Base Complex Using Conditions Suitable for Retention of Acid-labile Protecting Groups
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2017
Here, we present an efficient hydrolysis and subsequent Fmoc protection of an amino acid isolated from a Ni-Schiff-base complex. Hydrolysis conditions presented here are suitable for use when retention of acid-labile side-chain protecting groups is required. This technique may be adaptable to a variety of unnatural amino acid substrates.
FAQs
BRCA1, BRCA2, and RAD51 help coat and preserve newly formed DNA when synthesis is disrupted. This coating limits access by nucleases, enzymes that can degrade nucleic acids, while the protected DNA remains available for repair or replication restart. Their coordinated activity connects fork stability with recovery from replication stress.
Newly formed DNA at a stalled fork is vulnerable to degradation by nucleases. Limiting this degradation helps preserve the DNA structure that must be repaired or used for replication restart. If protection fails, the resulting loss of replication-associated DNA can undermine genome integrity and increase the likelihood of chromosome instability.
The complex supports genome stability by maintaining the integrity of replication forks during disrupted DNA synthesis. When its protective function is impaired, chromosome instability can arise, linking fork protection to broader cellular consequences. This relationship helps explain why defects in replication-stress responses are relevant to cancer development and inherited repair disorders.
Researchers can examine how cells respond when DNA synthesis is disrupted, focusing on preservation of newly formed DNA, nuclease-associated degradation, and the coordination of repair or replication restart. They can then relate these fork-level outcomes to chromosome stability, providing a framework for understanding how replication stress affects genome integrity.
Its relevance to cancer research comes from the connection between defective fork protection, chromosome instability, and cancer development. Studying this connection can help characterize how cells respond to replication stress and clarify why altered protection may influence disease biology. The complex is also important for investigating how tumors respond to therapeutic treatments.
Replication stress can result from DNA damage or from limited cellular resources that disrupt DNA synthesis. Under these conditions, fork protection becomes important because the cell must preserve newly formed DNA and coordinate repair or restart. Examining these responses gives biology researchers insight into inherited repair disorders and therapeutic responses.