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Related Experiment Videos

Solving a 300 kDa multimeric protein by low-resolution MAD phasing and averaging/phase extension.

F X Gomis-Rüth1, M Coll

  • 1Institut de Biologia Molecular de Barcelona, CSIC, c/Jorda Girona 18-26, E-08034 Barcelona, Spain. xgrcri@ibmb.csic.es

Acta Crystallographica. Section D, Biological Crystallography
|May 26, 2001
PubMed
Summary

Researchers determined the structure of the conjugative coupling protein TrwB (TrwBDeltaN70) from E. coli plasmid R388. This protein is crucial for DNA transfer between bacterial cells.

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Area of Science:

  • Structural biology
  • Molecular biology
  • Microbiology

Background:

  • The conjugative coupling protein TrwBDeltaN70 is essential for DNA transfer mediated by Escherichia coli plasmid R388.
  • Understanding its structure is key to elucidating the mechanism of bacterial conjugation.

Purpose of the Study:

  • To determine the high-resolution three-dimensional structure of the TrwBDeltaN70 protein.
  • To provide insights into the molecular mechanisms of DNA transfer during bacterial conjugation.

Main Methods:

  • X-ray crystallography was employed using two crystal forms (trigonal and monoclinic).
  • Multi-wavelength anomalous dispersion (MAD) phasing was utilized for initial phase determination.
  • Molecular replacement was used to solve the monoclinic crystal structure.

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Main Results:

  • The structure of TrwBDeltaN70 was solved to 4.5 Å resolution using MAD phasing and further refined.
  • Two distinct hexameric structures of TrwBDeltaN70 were observed in the asymmetric units of the trigonal and monoclinic crystals.
  • The protein forms a large multimeric complex, consistent with its role in DNA transfer.

Conclusions:

  • The determined structures provide a detailed molecular model of TrwBDeltaN70.
  • This structural information will facilitate further studies on the mechanism of conjugative DNA transfer in bacteria.