Question

Diagram the mismatch repair mechanism in E. coli.

   Diagram the mismatch repair mechanism in E. coli.

Molecular Biology

Molecular Biology

Robert F. Weaver 5th Edition

Chapter 20, Problem 32

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This could be a base-base mismatch or an insertion/deletion loop. MutS binds to the mismatched DNA segment, recognizing the error. Show more…

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Diagram the mismatch repair mechanism in E. coli.

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Key Concepts

Mismatch Recognition Proteins

Proteins responsible for detecting base pair mismatches play a critical role in initiating the repair process. They bind to the distorted DNA helix caused by a mismatch and serve as a signal to recruit other proteins needed for repair.

Endonuclease Activity

The repair process involves an endonuclease enzyme that introduces a nick or a cut near the mismatch on the newly synthesized strand. This incision serves as the entry point for the excision of the faulty segment of DNA.

Mismatch Repair Mechanism

This is a cellular process that identifies and corrects erroneous insertions, deletions, and misincorporated bases that can arise during DNA replication and recombination. It maintains genomic stability by scanning newly synthesized DNA for mismatches and initiating repair processes to correct these errors.

DNA Methylation and Strand Discrimination

In many organisms, specific patterns of DNA methylation are used to distinguish the parental or original template strand from the newly synthesized strand. This discrimination is crucial because it allows the repair machinery to target the newly formed strand, which is more likely to contain replication errors.

Excision and Resynthesis

Following the incision, a combination of helicases and exonucleases remove the segment of DNA that includes the mismatch. The resulting gap is then refilled by DNA polymerase using the correct template as a guide, and the newly synthesized patch is sealed by DNA ligase to restore the continuity of the DNA strand.

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