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Chapter 11: Problem 15

List the proteins that unwind DNA during in vivo DNA synthesis. How do they function?

Short Answer

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Question: List the proteins that unwind DNA during in vivo DNA synthesis and briefly describe their functions. Answer: The primary proteins involved in unwinding DNA during in vivo DNA synthesis are Helicase, Topoisomerase, and Single-strand binding proteins (SSB). Helicase unwinds the DNA by separating the two strands, Topoisomerase resolves issues caused by overwinding, and SSBs stabilize the single-stranded DNA, ensuring that the replication machinery can access and copy the genetic information.

Step by step solution

01

Identify the primary proteins involved in unwinding DNA

In in vivo DNA synthesis, the proteins that are primarily responsible for unwinding the DNA molecule are Helicase, Topoisomerase, and Single-strand binding proteins (SSB).
02

Understanding the function of Helicase

Helicase is an enzyme that plays a key role in DNA replication by separating the two strands of the double helix. Its primary function is to use ATP to break the hydrogen bonds between the two nucleotide strands, thereby leading to the unwinding of the DNA molecule. Helicase moves along the DNA in a 5' to 3' direction, creating a replication fork.
03

Understanding the function of Topoisomerase

Topoisomerase is an enzyme that helps to manage the supercoiling or overwinding that occurs during the DNA unwinding process. The DNA ahead of the replication fork tends to become overwound, or supercoiled, due to the activity of helicase. Topoisomerase resolves this problem by cutting one or both DNA strands and allowing them to rotate around each other, thereby relieving the tension caused by overwinding. After this, Topoisomerase reseals the DNA strands, allowing the unwinding process to continue smoothly.
04

Understanding the function of Single-strand binding proteins (SSB)

Single-strand binding proteins (SSBs) are small proteins that bind to the separated single-strands of DNA after they are unwound by helicase. They play an essential role in stabilizing the single-stranded DNA and preventing them from reforming the double helix structure, thus allowing the replication machinery to successfully access and copy the genetic information on each strand.
05

Summary

During in vivo DNA synthesis, the proteins responsible for unwinding the DNA molecule are Helicase, Topoisomerase, and Single-strand binding proteins (SSB). Helicase unwinds the DNA by separating the two strands, Topoisomerase resolves issues caused by overwinding, and SSBs stabilize the single-stranded DNA, ensuring that the replication machinery can access and copy the genetic information.

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Most popular questions from this chapter

Suppose that \(E .\) coli synthesizes DNA at a rate of 100,000 nucleotides per minute and takes 40 minutes to replicate its chromo- some. (a) How many base pairs are present in the entire \(E .\) coli chromosome? (b) What is the physical length of the chromosome in its helical configuration- that is, what is the circumference of the chromosome if it were opened into a circle?

You have generated a mutant strain of eukaryotic cells that constitutively express proteins required for translesion DNA synthesis (TLS). Would these cells have a mutator phenotype? Explain. One of the strains that you are working with shows an additional mutation whereby the processivity of a TLS polymerase is increased. What would be the consequence of this mutation?

Many of the gene products involved in DNA synthesis were initially defined by studying mutant \(E .\) coli strains that could not synthesize DNA. (a) The \(d n a E\) gene encodes the a subunit of DNA polymerase III. What effect is expected from a mutation in this gene? How could the mutant strain be maintained? (b) The \(d n a Q\) gene encodes the \(\varepsilon\) subunit of DNA polymerase. What effect is expected from a mutation in this gene?

List and describe the function of the ten subunits constituting DNA polymerase III. Distinguish between the holoenzyme and the core enzyme.

Summarize and compare the properties of DNA polymerase I II, and III.
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