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Biochemistry (Moscow)

, Volume 76, Issue 11, pp 1210–1219 | Cite as

Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA

  • L. I. Fedoreyeva
  • I. I. Kireev
  • V. Kh. Khavinson
  • B. F. VanyushinEmail author
Article

Abstract

Marked fluorescence in cytoplasm, nucleus, and nucleolus was observed in HeLa cells after incubation with each of several fluorescein isothiocyanate-labeled peptides (epithalon, Ala-Glu-Asp-Gly; pinealon, Glu-Asp-Arg; testagen, Lys-Glu-Asp-Gly). This means that short biologically active peptides are able to penetrate into an animal cell and its nucleus and, in principle they may interact with various components of cytoplasm and nucleus including DNA and RNA. It was established that various initial (intact) peptides differently affect the fluorescence of the 5,6-carboxyfluorescein-labeled deoxyribooligonucleotides and DNA-ethidium bromide complexes. The Stern-Volmer constants characterizing the degree of fluorescence quenching of various single- and double-stranded fluorescence-labeled deoxyribooligonucleotides with short peptides used were different depending on the peptide primary structures. This indicates the specific interaction between short biologically active peptides and nucleic acid structures. On binding to them, the peptides discriminate between different nucleotide sequences and recognize even their cytosine methylation status. Judging from corresponding constants of the fluorescence quenching, the epithalon, pinealon, and bronchogen (Ala-Glu-Asp-Leu) bind preferentially with deoxyribooligonucleotides containing CNG sequence (CNG sites are targets for cytosine DNA methylation in eukaryotes). Epithalon, testagen, and pinealon seem to preferentially bind with CAG- but bronchogen with CTG-containing sequences. The site-specific interactions of peptides with DNA can control epigenetically the cell genetic functions, and they seem to play an important role in regulation of gene activity even at the earliest stages of life origin and in evolution.

Key words

short biologically active peptides peptide-oligonucleotide (DNA) binding DNA methylation regulation of genetic functions 

Abbreviations

DAPI

4′,6-diamidino-2-phenylindole

DNA-EB

DNA-ethidium bromide complex

FAM

5,6-carboxyfluorescein

FITC

fluorescein isothiocyanate

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • L. I. Fedoreyeva
    • 1
    • 2
  • I. I. Kireev
    • 2
  • V. Kh. Khavinson
    • 3
  • B. F. Vanyushin
    • 1
    • 2
    Email author
  1. 1.All Russia Research Institute of Agricultural BiotechnologyRussian Academy of Agricultural SciencesMoscowRussia
  2. 2.Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia
  3. 3.St. Petersburg Institute of Bioregulation and GerontologyRussian Academy of Medical SciencesSt. PetersburgRussia

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