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Related Experiment Videos

A method to identify and characterize Z-DNA binding proteins using a linear oligodeoxynucleotide

A G Herbert1, A Rich

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Nucleic Acids Research
|June 11, 1993
PubMed
Summary

Researchers developed a novel Z-DNA oligodeoxynucleotide probe for detecting Z-DNA binding proteins. This labeled probe enables precise determination of protein binding specificity and molecular weight via bandshift and crosslinking experiments.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • The Z-DNA conformation is a left-handed double helix distinct from the canonical B-DNA.
  • Identifying proteins that specifically bind to Z-DNA is crucial for understanding its biological roles.

Purpose of the Study:

  • To synthesize a labeled oligodeoxynucleotide probe capable of forming Z-DNA.
  • To establish methods for characterizing Z-DNA binding proteins using this probe.

Main Methods:

  • Incorporation of 5-bromodeoxycytosine and deoxyguanosine into a (dC-dG)22 template using Klenow enzyme.
  • Radioactive labeling with 32P for bandshift assays.
  • UV crosslinking of DNA-protein complexes to estimate protein molecular weight.
  • Competition assays with unlabeled DNA competitors.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-20NASA Program ExobiologyNon-NASA Center

Related Experiment Videos

Main Results:

  • Successfully synthesized a Z-DNA-forming oligodeoxynucleotide.
  • Demonstrated the utility of the labeled probe in bandshift experiments to detect Z-DNA binding proteins.
  • Showcased UV crosslinking for estimating the molecular weight of bound proteins.
  • Validated the techniques using anti-Z-DNA antiserum.

Conclusions:

  • The developed Z-DNA oligodeoxynucleotide probe is a valuable tool for studying Z-DNA-protein interactions.
  • The combined bandshift and crosslinking approach provides reliable characterization of Z-DNA binding proteins.