Question

What evidence indicates that RecA coats single-stranded DNA? What role does SSB play in the interaction between RecA and single-stranded DNA?

   What evidence indicates that RecA coats single-stranded DNA? What role does SSB play in the interaction between RecA and single-stranded DNA?

Molecular Biology

Molecular Biology

Robert F. Weaver 5th Edition

Chapter 22, Problem 2

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RecA is a protein essential for DNA repair and recombination in bacteria. It binds to single-stranded DNA (ssDNA) and facilitates strand invasion and exchange during homologous recombination. Single-stranded DNA-binding protein (SSB) binds to ssDNA exposed during Show more…

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What evidence indicates that RecA coats single-stranded DNA? What role does SSB play in the interaction between RecA and single-stranded DNA?

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Key Concepts

RecA Nucleoprotein Filament Formation

RecA is known to polymerize along single-stranded DNA (ssDNA) to form a filamentous structure that is essential for homologous recombination and DNA repair. Evidence such as electron microscopy imaging and kinetic assays has demonstrated that RecA molecules cover the ssDNA, providing both a physical barrier and a framework for subsequent strand exchange processes.

Single-Stranded DNA Binding (SSB) Protein Function

The single-stranded DNA binding protein (SSB) binds to ssDNA with high affinity to protect it from degradation and prevent the formation of secondary structures that could impede repair. However, SSB must eventually be displaced or reorganized to allow for the nucleation and stable binding of RecA. This interaction between SSB and RecA ensures that the ssDNA remains protected until the appropriate recombination machinery is assembled, thus playing a crucial regulatory role in DNA repair mechanisms.

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