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Related Experiment Videos

Solving DNA structures by MERLOT.

R Chattopadhyaya1, P Chakrabarti

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles 90024.

Acta Crystallographica. Section B, Structural Science
|December 1, 1988
PubMed
Summary
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MERLOT, a molecular replacement package, successfully determined initial phases for five oligonucleotide structures, including two solved ab initio. This study explores challenges and solutions for molecular replacement in DNA structure determination.

Area of Science:

  • Structural Biology
  • Computational Crystallography
  • Molecular Biology

Background:

  • Determining initial phases is crucial for solving complex molecular structures using X-ray crystallography.
  • Molecular replacement is a powerful technique for phasing, but its application to DNA structures can be challenging.
  • Oligonucleotide structures present unique challenges due to their size and symmetry.

Purpose of the Study:

  • To evaluate the efficacy of the MERLOT molecular replacement package for solving oligonucleotide structures.
  • To demonstrate the ab initio phasing capabilities of MERLOT for DNA structures.
  • To identify and discuss problems and solutions related to applying molecular replacement to DNA oligomers.

Main Methods:

  • Utilized the MERLOT computer package for molecular replacement.

Related Experiment Videos

  • Applied MERLOT to solve two new oligonucleotide structures (CCGG and CGCGCGTTTTCGCGCG) ab initio.
  • Re-examined four previously solved DNA oligomer structures (ioCCGG, CGCGAATTCGCG, CGCGAATTbrCGCG) using MERLOT.

    • Main Results:

    • Successfully determined initial phases for five diverse oligonucleotide structures.
    • Achieved ab initio structure solution for two complex oligonucleotide structures using MERLOT.
    • Demonstrated MERLOT's utility in re-analyzing existing DNA oligomer datasets.

    Conclusions:

    • MERLOT is an effective tool for determining initial phases of oligonucleotide structures.
    • Ab initio phasing with MERLOT is feasible for complex DNA oligomers.
    • The study provides insights into overcoming challenges in molecular replacement for DNA crystallography.