Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 15, 1995 | Published
Journal Article Open

A Yeast Gene Required for DNA Replication Encodes a Protein with Homology to DNA Helicases


A yeast gene has been identified by screening for DNA replication mutants using a permeabilized cell replication assay. The mutant is temperature sensitive for growth and shows a cell cycle phenotype typical of DNA replication mutants. RNA synthesis is normal in the mutant but DNA synthesis ceases upon shift to the nonpermissive temperature. The DNA2 gene was cloned by complementation of the dna2ts gene phenotype. The gene is essential for viability. The gene encodes a 172-kDa protein with characteristic DNA helicase motifs. A hemagglutinin epitope-Dna2 fusion protein was prepared and purified by conventional and immunoaffinity chromatography. The purified protein is a DNA-dependent ATPase and has 3' to 5' DNA helicase activity specific for forked substrates. A nuclease activity that endonucleolytically cleaves DNA molecules having a single-stranded 5' tail adjacent to a duplex region copurifies through all steps with the fusion protein.

Additional Information

© 1995 by National Academy of Sciences Communicated by John Abelson, California Institute of Technology, Pasadena, CA, April 28, 1995 This work was supported by U.S. Public Health Service Grant GM25508. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.

Attached Files

Published - BUDpnas95.pdf


Files (1.4 MB)
Name Size Download all
1.4 MB Preview Download

Additional details

August 22, 2023
October 16, 2023