NSD Search and Computational Engines 

Normal-Coordinate Structural Decomposition (NSD) for Hemeproteins in the PDB.
The NSD method is illustrated for the heme of horse cytochrome c here (html or pdf format).  There are 1,579 heme structures from about 750 hemeprotein structures in the Protein Data Bank (PDB) that have been analyzed by NSD.  Search engines are provided for retrieving the data by the PDB code.  For proteins that have not already been analyzed by NSD and other porphyrin structures, a web version of the NSD program is also provided so you analyze your own structures.

• Out-of-plane NSD results for hemeproteins in the PDB. 
• In-plane NSD result for hemeproteins in the PDB. 
  The in-plane deformations are not usually statistically significant...but there are exceptions.

NSD for Arbitrary Tetrapyrrole Structures.
A JAVA program is provide for web-based NSD calculation for arbitrary tetrapyrrole structures.  All you need is a structure file in PDB format.

• NSD Computational Engine.  New Version 3.0 - June 1, 2005  (Now with ).