Ramachandran Principle: Protein Atomic Clashes vs. Phi & Psi
Channel: Eric Martz
Date: 2018-07-10

Animated atomic models illustrating Phi and Psi dihedral (torsion) angles in proteins, and how atomic clashes make certain angles impossible, favoring the secondary structures of alpha helices, beta sheets, and turns. Clashes are shown forming in real time as phi or psi rotate. Related resources:
-- Quiz (9 questions): http://proteopedia.org/w/User:Eric_Martz/Ramachandran_Principle_Quiz
-- Slideshow: http://tinyurl.com/RamachandranPrinciple
-- Interactive 3D tutorial with rotation controls:
   -- http://bioinformatics.org/molvis/phipsi  or
   -- http://proteopedia.org/w/Tutorial:Ramachandran_principle_and_phi_psi_angles
-- Other Ramachandran and Phi/Psi Resources: http://proteopedia.org/w/Dihedral/Index
EN ESPAÑOL:
 -- Cuestionario: http://proteopedia.org/w/Dihedral/Ramachandran_Principle_Quiz_%28Spanish%29
 -- Presentación: http://tinyurl.com/PrincipioRamachandran
 -- Otros recursos: http://proteopedia.org/w/Dihedral/Index

The RAMACHANDRAN PLOT shown excludes glycine, proline, and pre-proline. Those other plots are available at https://en.wikipedia.org/wiki/Ramachandran_plot#Gallery

Also recommended: Understanding PHI and PSI Angles, Ramachandran Plots, & Newman Projections -- https://www.youtube.com/watch?v=JyUMLSsbecI