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Molecular and Cellular Biology, February 2000, p. 1361-1369, Vol. 20, No. 4
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Yeast Meiosis-Specific Protein Hop1 Binds to G4 DNA and Promotes Its Formation

K. Muniyappa,1,2 S. Anuradha,1 and Breck Byers2,*

Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India,1 and Department of Genetics, University of Washington, Seattle, Washington 981952

Received 28 July 1999/Returned for modification 22 September 1999/Accepted 19 November 1999

DNA molecules containing stretches of contiguous guanine residues can assume a stable configuration in which planar quartets of guanine residues joined by Hoogsteen pairing appear in a stacked array. This conformation, called G4 DNA, has been implicated in several aspects of chromosome behavior including immunoglobulin gene rearrangements, promoter activation, and telomere maintenance. Moreover, the ability of the yeast SEP1 gene product to cleave DNA in a G4-DNA-dependent fashion, as well as that of the SGS1 gene product to unwind G4 DNA, has suggested a crucial role for this structure in meiotic synapsis and recombination. Here, we demonstrate that the HOP1 gene product, which plays a crucial role in the formation of synaptonemal complex in Saccharomyces cerevisiae, binds robustly to G4 DNA. The apparent dissociation constant for interaction with G4 DNA is 2 × 10-10, indicative of binding that is about 1,000-fold stronger than to normal duplex DNA. Oligonucleotides of appropriate sequence bound Hop1 protein maximally if the DNA was first subjected to conditions favoring the formation of G4 DNA. Furthermore, incubation of unfolded oligonucleotides with Hop1 led to their transformation into G4 DNA. Methylation interference experiments confirmed that modifications blocking G4 DNA formation inhibit Hop1 binding. In contrast, neither bacterial RecA proteins that preferentially interact with GT-rich DNA nor histone H1 bound strongly to G4 DNA or induced its formation. These findings implicate specific interactions of Hop1 protein with G4 DNA in the pathway to chromosomal synapsis and recombination in meiosis.

* Corresponding author. Mailing address: Department of Genetics, Box 357360, University of Washington, Seattle, WA 98195-7360. Phone: (206) 543-9068. Fax: (206) 543-0754. E-mail:byers{at}genetics.washington.edu.

Molecular and Cellular Biology, February 2000, p. 1361-1369, Vol. 20, No. 4
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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