Yeast Rvb1 and Rvb2 are ATP-dependent DNA helicases that form a heterohexameric complex

J Mol Biol. 2008 Mar 7;376(5):1320-33. doi: 10.1016/j.jmb.2007.12.049. Epub 2008 Jan 3.


Rvb1 and Rvb2 are highly conserved proteins present in archaea and eukaryotes. These proteins are members of a large superfamily of ATPases associated with diverse cellular activities--the AAA(+) superfamily. The Rvbs have been found in multiprotein complexes that have wide ranges of functions, including DNA repair, transcription, chromatin remodeling, ribosomal RNA processing, and small nucleolar RNA accumulation. Here we show that yeast Rvb1 and Rvb2 form a heterohexameric ring structure rather than the double-hexameric ring structure proposed to be formed by the human proteins. The yeast Rvb1/2 complex has enhanced ATPase activity compared with the individual Rvb proteins; furthermore, the ATPase activity of the Rvb1/2 complex is further increased in the presence of double-stranded DNA with 5' or 3' overhangs. The yeast Rvb1/2 ring undergoes nucleotide-dependent conformational changes as observed by electron microscopy. In addition, consistent with a role for these proteins in chromatin remodeling and DNA repair, the yeast Rvb1/2 complex exhibits DNA helicase activity with a preference for unwinding in the 5'-to-3' direction. The individual Rvb proteins also exhibit helicase activity, albeit weaker than that of the Rvb1/2 complex. These results clearly establish the yeast Rvb1/2 complex as a heterohexameric ATP-dependent DNA helicase and highlight the possible roles played by the Rvb proteins within multiprotein complexes.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • ATPases Associated with Diverse Cellular Activities
  • Adenosine Triphosphatases / chemistry
  • Adenosine Triphosphatases / metabolism*
  • Amino Acid Sequence
  • Carrier Proteins / chemistry
  • DNA Helicases / chemistry
  • DNA Helicases / metabolism*
  • Humans
  • Molecular Sequence Data
  • Multiprotein Complexes / chemistry
  • Multiprotein Complexes / metabolism
  • Saccharomyces cerevisiae / enzymology*
  • Saccharomyces cerevisiae Proteins / chemistry
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Sequence Alignment
  • Transcription Factors


  • Carrier Proteins
  • Multiprotein Complexes
  • Saccharomyces cerevisiae Proteins
  • Transcription Factors
  • Adenosine Triphosphatases
  • RVB1 protein, S cerevisiae
  • RVB2 protein, S cerevisiae
  • ATPases Associated with Diverse Cellular Activities
  • DNA Helicases
  • RUVBL1 protein, human