Coiled-coil Accommodation Index analysis
This program analyses imperfections in coiled-coil structures via the "accommodation index" (AI) parameter. AI enables the detection and classification of disruptions in the ideal coiled-coil geometry, also identifying the "accommodation length" over which the perturbation is integrated [1].

PDB File:      OR     PDB ID:

Coiled-coil region*: (PyMOL-style selection)

Scan window**:

* all residues must at least have a CA atom
** perturbations will be detected by fitting local Crick parameters in windows of this width

[1] N. W. Schmidt, G. Grigoryan, W. F. DeGrado, "The accommodation index measures the perturbation associated with insertions and deletions in coiled coils. Application to understand signaling in histidine kinases," Protein Science (in press).