Deriving the ultrastructure of α-crustacyanin using lower-resolution structural and biophysical methods.
JOURNAL OF SYNCHROTRON RADIATION(2011)
摘要
The low-resolution structure of alpha-crustacyanin has been determined to 30 angstrom resolution using negative-stain electron microscopy (EM) with single-particle averaging. The protein, which is an assembly of eight beta-crustacyanin dimers, appears asymmetrical and rather open in layout. A model was built to the EM map using the X-ray crystallographic structure of beta-crustacyanin guided by PISA interface analyses. The model has a theoretical sedimentation coefficient that matches well with the experimentally derived value from sedimentation velocity analytical ultracentrifugation. Additionally, the EM model has similarities to models calculated independently by rigid-body modelling to small-angle X-ray scattering (SAXS) data and extracted in silico from the beta-crustacyanin crystal lattice. Theoretical X-ray scattering from each of these models is in reasonable agreement with the experimental SAXS data and together suggest an overall design for the alpha-crustacyanin assembly.
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关键词
alpha-crustacyanin,EM,SAXS,crystal packing of 1gka,PISA,analytical ultracentrifugation
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