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Related Experiment Videos

Sequence specificity of the human autonomously replicating sequence binding protein.

S Izuta1, M Suzuki, K Kojima

  • 1Research Institute for Disease Mechanism and Control, Nagoya University School of Medicine, Japan.

Nucleic Acids Symposium Series
|January 1, 1989
PubMed
Summary

Researchers identified the specific DNA sequence and structure recognized by a protein that binds to human autonomously replicating sequences (ARS). This finding advances understanding of DNA replication origins and potential c-myc proto-oncogene interactions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Autonomously replicating sequences (ARS) are crucial for DNA replication initiation in eukaryotes.
  • The c-myc proto-oncogene product was previously implicated as a protein binding to essential regions of human ARS.
  • Understanding ARS-binding proteins is key to elucidating DNA replication mechanisms.

Purpose of the Study:

  • To determine the precise binding specificity of the human ARS binding protein.
  • To investigate whether the protein recognizes specific nucleotide sequences or DNA structural elements.
  • To further characterize the interaction between ARS and potential regulatory proteins.

Main Methods:

  • Purification of human ARS binding protein from Raji cells (Burkitt's lymphoma).

Related Experiment Videos

  • Oligodeoxynucleotide binding assays to identify sequence preferences.
  • Competition analysis to assess recognition of sequence versus structure.

    • Main Results:

    • The purified ARS binding protein specifically bound to oligodeoxynucleotides containing the 5'-CAPyCTCTNA-3' sequence.
    • Competition assays demonstrated that the protein recognizes both the nucleotide sequence and the higher-ordered DNA structure.
    • This indicates a complex binding mechanism beyond simple sequence complementarity.

    Conclusions:

    • The human ARS binding protein exhibits specific recognition of a defined DNA sequence motif (5'-CAPyCTCTNA-3').
    • The protein's binding is influenced by DNA secondary or tertiary structure, suggesting a sophisticated interaction.
    • These findings refine our understanding of DNA replication origin recognition and the role of associated proteins.