4 March 2026: Apologies for the downtime this morning caused by a problem with our ISP

Peptide Builder

This page allows you to enter phi and psi values for a peptide. These will be used to generate a poly-alanine peptide with the specified geometry, generating a picture of your peptide and allowing you to view it interactively.

For an phi = -57.8; psi = -47
For a phi = -139; psi = +135
For a phi = -49; psi = -26
For a phi = -57.1; psi = -69.7
For a phi = -51; psi = +153
For a phi = -79; psi = +150
For a phi = +57 psi = +47

Phi
Psi

Optionally, you can randomize the phi/psi angles by +/-5 degrees: No    Yes