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Diagram the error-prone bypass system in E. coli.

   Diagram the error-prone bypass system in E. coli.

Molecular Biology

Molecular Biology

Robert F. Weaver 5th Edition

Chapter 20, Problem 34

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Solved by Expert Carlene Jimenez

07/06/2020

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coli, which is a mechanism that allows the bacteria to replicate DNA in the presence of damage, albeit with a higher chance of introducing mutations. Show more…

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Diagram the error-prone bypass system in E. coli.

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Key Concepts

Translesion DNA Synthesis

Translesion DNA synthesis (TLS) is a DNA damage tolerance mechanism that allows the DNA replication machinery to bypass lesions or distortions in the DNA template. This process is inherently error-prone because the specialized DNA polymerases involved lack proofreading activity, often resulting in mutations during synthesis.

SOS Response

The SOS response is a global regulatory network activated by significant DNA damage. In bacteria such as E. coli, the SOS response upregulates the expression of specialized DNA polymerases and other proteins that help the cell cope with DNA lesions, thereby enabling translesion synthesis despite the potential for introducing errors.

Specialized Low-Fidelity DNA Polymerases

Specialized low-fidelity DNA polymerases are distinct from the high-fidelity replication polymerases and are capable of synthesizing DNA across damaged templates. Their catalytic properties allow them to insert nucleotides opposite various lesions, albeit with a higher error rate, which is a key feature of error-prone bypass systems.

DNA Polymerase Switching Mechanism

The DNA polymerase switching mechanism refers to the process by which the replication machinery temporarily replaces the main high-fidelity polymerase with a specialized low-fidelity polymerase to bypass DNA lesions. Once the lesion is bypassed, the system typically reverts to the high-fidelity replicative polymerase to continue accurate DNA replication.

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