| Literature DB >> 8052638 |
R Giraldo1, M Suzuki, L Chapman, D Rhodes.
Abstract
Repressor-activator protein 1 (RAP1) has an essential role in the maintenance of yeast telomeres. Yeast telomeric DNA consists of simple repeated G-rich sequences that are bound by RAP1. We have found that RAP1, in addition to its known binding activity for double-stranded DNA, interacts with the G-rich strand containing guanine base (G)-tetrads. We show here using circular dichroism spectroscopy that RAP1 promotes the formation of one particular type of DNA quadruplex, parallel G4-DNA. Furthermore, RAP1 is able to bind to both preformed parallel and antiparallel DNA quadruplexes. These results have implications for the possible use of DNA quadruplexes in telomere-telomere association in vivo.Entities:
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Year: 1994 PMID: 8052638 PMCID: PMC44461 DOI: 10.1073/pnas.91.16.7658
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205