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Related Concept Videos

Southern Blot02:57

Southern Blot

Agarose gel electrophoresis is very useful in separating DNA fragments by size. Running a DNA ladder containing fragments of the known length alongside the sample helps determine the approximate length of the sample DNA fragments. However, additional steps are needed to verify the sequence identity of the sample DNA fragments.
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...

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Visualizing Binding of Single SMC Complexes to DNA Substrates Using Combinational Optical Tweezers and Fluorescence

Anno I Koetje1, Gemma L M Fisher1, Menelaos Voulgaris1

  • 1DNA Motors Group, MRC Laboratory of Medical Sciences, London, UK.

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Summary

Structural Maintenance of Chromosomes (SMC) complexes are vital for genome organization. New single-molecule techniques visualize their DNA interactions, revealing binding dynamics and substrate preferences for cohesin and Smc5/6.

Keywords:
DNA substratesFluorescence microscopyMicrofluidicsOptical tweezersSingle molecule

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biophysics

Background:

  • Structural Maintenance of Chromosomes (SMC) complexes play crucial roles in genome organization and maintenance.
  • Characterizing SMC-DNA interactions is challenging due to complex dynamics and multiple binding sites.
  • Fundamental questions persist regarding SMC substrate specificity, binding stability, and loading/unloading mechanisms.

Purpose of the Study:

  • To detail methods for preparing eukaryotic SMC complexes (cohesin and Smc5/6) for single-molecule experiments.
  • To enable visualization and characterization of individual SMC complexes binding to DNA substrates.
  • To probe the influence of factors like ATP turnover and force on SMC-DNA interactions.

Main Methods:

  • Utilizing correlative optical tweezers and fluorescence microscopy with microfluidics.
  • Employing recombinant preparation of fluorophore-labeled SMC complexes and diverse DNA substrates.
  • Leveraging the LUMICKS C-Trap system for high-resolution real-time analysis.

Main Results:

  • Demonstrated a powerful toolkit for visualizing individual SMC complexes on DNA.
  • Enabled probing of ATP turnover, force dependencies, and complex stoichiometry.
  • Provided access to heterogeneous and transient SMC behaviors missed by ensemble assays.

Conclusions:

  • Single-molecule techniques offer unprecedented resolution for studying SMC-DNA interactions.
  • This approach facilitates a deeper understanding of genome organization and maintenance mechanisms.
  • Custom data analysis scripts aid in automated detection and localization of DNA binding events.