Dear Thomas 

There are several Ig-like domains that do not contain S-S bridges . 
I am not aware of a software tool that does what you'd like. However, two key 
papers on the Ig-like fold (old but still very relevant) that might be useful 
to you are:

(1) Bork, Holm & Sander - The Immunoglobulin Fold. Strcutural Classification, 
Sequence Patterns and Common Core - J.Mol.Biol (1994) 242, 309-320.

(2) Harpaz & Chothia - Many of the Immunoglobulin Superfamily Domains in Cell 
Adhesion Molecules and Surface Receptors Belong to a New Structural Set Which 
is Close to That Containing Variable Domains - J. Mol. Biol. (1994), 238, 
528-539.

With best wishes
Roberto


On 9 Oct 2014, at 08:42, Thomas Krey <tk...@pasteur.fr> wrote:

> Dear all,
> 
> I was wondering, if there is a tool out there that allows the easy 
> classification of immunoglobulin and Ig-like domain subclasses based on a 
> given pdb file. As far as I am aware the state-of-the-art for immunoglobulin 
> domains is to determine the distance (in amino acids) between the two 
> cysteines forming the canonical disulfide bond between strands B and F. 
> However, I am facing a couple of Ig-like domains that do not contain this 
> disulfide bond !
> Any help will be highly appreciated.
> 
> Best regards
> Thomas
> 
> Dr. Thomas Krey
> Institut Pasteur
> Structural Virology Unit
> 25-28 Rue du Docteur Roux
> 75015 Paris
> France
> tk...@pasteur.fr


Roberto A. Steiner, PhD
Randall Division of Cell and Molecular Biophysics
Faculty of Life Sciences and Medicine 
King's College London

roberto.stei...@kcl.ac.uk
Phone 0044 20 78488216
Fax    0044 20 78486435

Room 3.10A
New Hunt's House
Guy's Campus
SE1 1UL
London

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