Visualizing helicases unwinding DNA at the single molecule level.

Abstract:

:DNA helicases are motor proteins that catalyze the unwinding of double-stranded DNA into single-stranded DNA using the free energy from ATP hydrolysis. Single molecule approaches enable us to address detailed mechanistic questions about how such enzymes move processively along DNA. Here, an optical method has been developed to follow the unwinding of multiple DNA molecules simultaneously in real time. This was achieved by measuring the accumulation of fluorescent single-stranded DNA-binding protein on the single-stranded DNA product of the helicase, using total internal reflection fluorescence microscopy. By immobilizing either the DNA or helicase, localized increase in fluorescence provides information about the rate of unwinding and the processivity of individual enzymes. In addition, it reveals details of the unwinding process, such as pauses and bursts of activity. The generic and versatile nature of the assay makes it applicable to a variety of DNA helicases and DNA templates. The method is an important addition to the single-molecule toolbox available for studying DNA processing enzymes.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Fili N,Mashanov GI,Toseland CP,Batters C,Wallace MI,Yeeles JT,Dillingham MS,Webb MR,Molloy JE

doi

10.1093/nar/gkq173

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

4448-57

issue

13

eissn

0305-1048

issn

1362-4962

pii

gkq173

journal_volume

38

pub_type

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