Scientists at Penn State University (University Park, PA) used a fluorescent tagging method to uncover a key step in the process of human DNA replication. The work was led by Stephen J. Benkovic, an Evan Pugh Professor of Chemistry and holder of the Eberly Family Chair in Chemistry at Penn State.
Part of the DNA replication process—in humans and in other life forms—involves loading of molecular structures called sliding clamps onto DNA. This crucial step in DNA replication had remained somewhat mysterious and had not been well studied in human DNA replication. Mark Hedglin, a postdoctoral researcher in Penn State's Department of Chemistry and a member of Benkovic's team, explains that the sliding clamp is a ring-shaped protein that acts to encircle the DNA strand. The sliding clamp then serves to anchor polymerases to the DNA, ensuring efficient copying of the genetic material. "Without a sliding clamp, polymerases can copy very few bases—the molecular 'letters' that make up the code of DNA—at a time. But the clamp helps the polymerase to stay in place, allowing it to copy thousands of bases before being removed from the strand of DNA," Hedglin says.
Hedglin explains that, due to the closed circular structure of sliding clamps, another necessary step in DNA replication is the presence of a "clamp loader," which acts to latch and unlatch the sliding clamps at key stages during the process. "The big unknown has always been how the sliding clamp and the clamp loader interact and the timing of latching and unlatching of the clamp from the DNA," says Hedglin. "We know that polymerases and clamp loaders can't bind the sliding clamp at the same time, so the hypothesis was that clamp loaders latched sliding clamps onto DNA, then left for some time during DNA replication, returning only to unlatch the clamps after the polymerase left so they could be recycled for further use."
|Stephen J. Benkovic, Mark Hedglin, and other members of Professor Benkovic's research team have studied the importance of "clamp loader" enzymes and their activities during DNA replication. In this image, the clamp loader is represented, for illustrative purposes, by a hand, which is loading the sliding clamp ring onto DNA. (Image courtesy of the Benkovic lab, Penn State University)|
To test this hypothesis, the researchers used a method called Förster resonance energy transfer (FRET), a technique of attaching fluorescent "tags" to human proteins and sections of DNA in order to monitor the interactions between them. "With these tags in place, we then observed the formation of holoenzymes—the active form of the polymerase involved in DNA replication, which consists of the polymerase itself along with any accessory factors that optimize its activity," Hedglin says. "We found that whenever a sliding clamp is loaded onto a DNA template in the absence of polymerase, the clamp loader quickly removed the clamp so that free clamps did not build up on the DNA. However, whenever a polymerase was present, it captured the sliding clamp and the clamp loader then dissociated from the DNA strand."
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The team members also found that, during the moments when both the clamp loader and the clamp were bound to the DNA, they were not intimately engaged with each other. Rather, the clamp loader released the closed clamp onto the DNA, allowing an opportunity for the polymerase to capture the clamp, completing the assembly of the holoenzyme. Subsequently, the clamp loader dissociated from DNA. "Our research demonstrates that the DNA polymerase holoenzyme in humans consists of only a clamp and a DNA polymerase. The clamp loader is not part of it. It disengages from the DNA after the polymerase binds the clamp," Hedglin adds.
Benkovic notes that this mechanism provides a means for the cell to recycle scarce clamps when they are not in use for productive replication.
Full results of work are published in the open-access journal eLife; for more information, please visit http://elife.elifesciences.org/content/2/e00278.
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