4.4 Article

Application of DEN refinement and automated model building to a difficult case of molecular-replacement phasing: the structure of a putative succinyl-diaminopimelate desuccinylase from Corynebacterium glutamicum

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INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S090744491104978X

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Funding

  1. NIH, National Institutes of General Medical Sciences, Protein Structure Initiative [U54 GM094586, GM074898]
  2. Department of Energy, Office of Biological and Environmental Research
  3. National Institutes of Health (National Center for Research Resources, and the National Institute of General Medical Sciences)
  4. Howard Hughes Medical Institute
  5. Wellcome Trust
  6. NIH [GM063817]
  7. US Department of Energy at Lawrence Berkeley National Laboratory [DE-AC03-76SF00098]
  8. NIH/NIGMS [1P01GM063210]

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Phasing by molecular replacement remains difficult for targets that are far from the search model or in situations where the crystal diffracts only weakly or to low resolution. Here, the process of determining and refining the structure of Cgl1109, a putative succinyl-diaminopimelate desuccinylase from Corynebacterium glutamicum, at similar to 3 angstrom resolution is described using a combination of homology modeling with MODELLER, molecular-replacement phasing with Phaser, deformable elastic network (DEN) refinement and automated model building using AutoBuild in a semi-automated fashion, followed by final refinement cycles with phenix.refine and Coot. This difficult molecular-replacement case illustrates the power of including DEN restraints derived from a starting model to guide the movements of the model during refinement. The resulting improved model phases provide better starting points for automated model building and produce more significant difference peaks in anomalous difference Fourier maps to locate anomalous scatterers than does standard refinement. This example also illustrates a current limitation of automated procedures that require manual adjustment of local sequence misalignments between the homology model and the target sequence.

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