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Related Experiment Videos

Auracyanin B structure in space group P6(5).

Mihwa Lee1, Megan J Maher, Hans C Freeman

  • 1School of Molecular and Microbial Biosciences, University of Sydney, NSW 2006, Australia.

Acta Crystallographica. Section D, Biological Crystallography
|August 20, 2003
PubMed
Summary
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The crystal structure of auracyanin B, a blue copper protein from Chloroflexus aurantiacus, was determined in a new space group. This reveals how molecules rotate to form a different crystal lattice.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Crystallography

Background:

  • Auracyanin B is a blue copper protein from the bacterium Chloroflexus aurantiacus.
  • Its previous crystal structure was solved in space group P6(4)22.

Purpose of the Study:

  • To determine the crystal structure of auracyanin B in a new space group.
  • To understand the structural differences between crystal forms.

Main Methods:

  • Crystallization of auracyanin B in space group P6(5).
  • Structure solution using molecular replacement.
  • Refinement of the structure at 1.9 A resolution.

Main Results:

  • The new crystal form has unit-cell parameters a = b = 115.9, c = 108.2 A.

Related Experiment Videos

  • The asymmetric unit contains four protein molecules.
  • The structure was refined with final residuals R = 19.2% and R(free) = 21.9%.

    • Conclusions:

    • The observed changes in unit-cell volume and symmetry are due to small rotations between molecules.
    • This provides new insights into the crystal packing of auracyanin B.