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Updated: Nov 21, 2025

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
Sequential Dihedral Angles (SDAs): A Method for Evaluating the 3D Structure of Proteins
Babak Esfandi1, Morteza Atabati2
1School of Chemistry, Damghan University, Damghan, Iran.
Abstract:
One of the most important steps in modeling three-dimensional (3D) structures of proteins is the evaluation of the constructed models. The present study suggests that the correctness of a structure may be tested by using the characteristics of sequential dihedral angles (SDAs) between adjacent alpha-carbons (Cα) in the main chains of proteins. From our studies on protein structures in the protein data bank (PDB), the SDAs between the Cα in the main chains are limited in their values. In addition, the sum of the absolute values of the three sequential dihedral angles (SDAs) can never be 0 degree. Moreover, 48 degrees is the lowest value existing for the sum of the absolute values of three sequential dihedral angles (SDAs). Thus, the SDAs between the alpha-carbons along the main chains of proteins may be a useful parameter for evaluating anomalies in protein structures.
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