Insight into helicase mechanism and function revealed through single-molecule approaches

Jaya G. Yodh, Michael Schlierf, Taekjip Ha

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


Helicases are a class of nucleic acid (NA) motors that catalyze NTP-dependent unwinding of NA duplexes into single strands, a reaction essential to all areas of NA metabolism. In the last decade, single-molecule (sm) technology has proven to be highly useful in revealing mechanistic insight into helicase activity that is not always detectable via ensemble assays. A combination of methods based on fluorescence, optical and magnetic tweezers, and flow-induced DNA stretching has enabled the study of helicase conformational dynamics, force generation, step size, pausing, reversal and repetitive behaviors during translocation and unwinding by helicases working alone and as part of multiprotein complexes. The contributions of these sm investigations to our understanding of helicase mechanism and function will be discussed.

Original languageEnglish (US)
Pages (from-to)185-217
Number of pages33
JournalQuarterly Reviews of Biophysics
Issue number2
StatePublished - May 2010
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics


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