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MCM forked substrate specificity involves dynamic interaction with the 5'-tail.

Eli Rothenberg1, Michael A Trakselis, Stephen D Bell

  • 1Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801, USA..

The Journal of Biological Chemistry
|September 22, 2007
PubMed
Summary
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The archaeal minichromosome maintenance protein (MCM) preferentially binds forked DNA substrates. This binding interaction, involving MCM loading onto the 3'-tail, enhances complex stability and influences unwinding mechanisms.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • The minichromosome maintenance (MCM) protein complex is a crucial DNA replicative helicase in archaea and eukaryotes.
  • Archaeal MCM serves as a model system for understanding eukaryotic MCM function.
  • Understanding MCM substrate specificity and binding mechanisms is key to elucidating DNA replication initiation.

Purpose of the Study:

  • To investigate the substrate specificity of the archaeal MCM complex from Sulfolobus solfataricus.
  • To elucidate the binding mechanism of MCM on various DNA substrates using single-molecule techniques.
  • To explore the dynamic interactions between MCM and forked DNA structures.

Main Methods:

  • Single-molecule fluorescence resonance energy transfer (smFRET) assays.

Related Experiment Videos

  • Utilized various DNA substrates including forked, partial duplex, and full duplex forms.
  • Characterized binding preference and interaction dynamics of S. solfataricus MCM.

    • Main Results:

    • S. solfataricus MCM exhibits a preference for forked DNA substrates over partial or full duplexes.
    • MCM demonstrates distinct binding to Y-shaped substrates, loading on the 3 -tail while interacting with the 5 -tail.
    • This interaction enhances the stability of the forked DNA-MCM complex.

    Conclusions:

    • The study provides the first dynamic view of a ring-shaped helicase interacting with single-stranded DNA tails.
    • MCM's interaction with forked DNA contributes to substrate selectivity and complex stability.
    • Findings offer insights into the broader MCM unwinding mechanism and its role in DNA replication.