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Paper   IPM / Biological / 13242
School of Biological Sciences
  Title:   PROSIGN: A Method for Protein Secondary Structure Assignment Based on Three-Dimensional Coordinates of Cosecutive Ca atoms
1.  S. R. Hosseini.
2.  M. Sadeghi.
3.  H. Pezeshk.
4.  C. Eslahchi.
5.  M. Habibi.
  Status:   Published
  Journal: Computational Biology and Chemistry
  No.:  6
  Vol.:  32
  Year:  2008
  Pages:   406-411
  Supported by:  IPM
The automatic assignment of secondary structure from three-dimensional atomic coordinates of proteins is an essential step for the analysis and modeling of protein structures. So different methods based on different criteria have been designed to perform this task. We introduce a new method for protein secondary structure assignment based solely on Cα coordinates. We introduce four certain relations between Cα three-dimensional coordinates of consecutive residues, each of which applies to one of the four regular secondary structure categories: α-helix, 310-helix, �?-helix and β-strand. In our approach, the deviation of the Cα coordinates of each residue from each relation is calculated. Based on these deviation values, secondary structures are assigned to all residues of a protein. We show that our method agrees well with popular methods as DSSP, STRIDE and assignments in PDB files. It is shown that our method gives more information about helix geometry leading to more accurate secondary structure assignment.

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