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Related Experiment Videos

How the multifunctional yeast Rap1p discriminates between DNA target sites: a crystallographic analysis.

H O Taylor1, M O'Reilly, A G Leslie

  • 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK. rhodes@mrc-lmb.cam.ac.uk

Journal of Molecular Biology
|November 4, 2000
PubMed
Summary
This summary is machine-generated.

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Researchers studied the Rap1p DNA-binding protein from Saccharomyces cerevisiae to understand how it recognizes different DNA sites. The crystal structures reveal subtle protein movements, not large domain changes, enable Rap1p to bind distinct DNA sequences.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Yeast Genetics

Background:

  • Rap1p is a key Saccharomyces cerevisiae protein regulating gene expression and telomere length.
  • Understanding Rap1p's DNA-binding specificity is crucial for deciphering its diverse cellular roles.

Purpose of the Study:

  • To elucidate the structural basis of Rap1p's discrimination between different DNA-binding sites.
  • To determine the crystal structure of the Rap1p DNA-binding domain (Rap1pDBD) complexed with two distinct DNA sequences.

Main Methods:

  • X-ray crystallography was employed to determine the structures of Rap1pDBD bound to HMRE and TeloS DNA sites.
  • Merohedral twinning was addressed by identifying the twinning operator and calculating untwinned electron density maps.
  • Analysis of protein-DNA interactions at the interface was performed.

Related Experiment Videos

Main Results:

  • Crystal structures of Rap1pDBD complexed with HMRE and TeloS binding sites were successfully determined.
  • Rap1pDBD binds to these distinct sites via subtle side-chain adjustments at the protein-DNA interface.
  • No global domain rearrangements were observed in response to different DNA sequences.

Conclusions:

  • Rap1p achieves sequence specificity through fine-tuned conformational changes in its DNA-binding domain.
  • These findings provide atomic-level insights into Rap1p's regulatory mechanisms in gene silencing and telomere maintenance.
  • The study overcomes challenges posed by crystal twinning to deliver high-resolution structural data.