Pseudo-dihedral Angles in Proteins Providing a New Description of the Ramachandran Map

Since the first years of structural biology, Ramachandran map has provided a simple definition curvilinear geometry protein backbone. Its is mainly based on values dihedral angles $$\phi $$ and $$\psi measured between heavy atoms Discontinuities in angle are observed, particularly region $$\beta -strand secondary structure. We introduce new pseudo-dihedral involving hydrogen positions instead some atoms. determine relationships old angles. show that combining parameters allows us to overcome discontinuity problem encountered map.