Hello Amit, without PRODRG I don't know of another way to make the SHELX 
dictionary restraints but it can be done by hand with a small-molecule 
structure to measure the bond lengths and 1-3 atom distances from. You can also 
use general values for the ideal bond lengths and angles and the cosine rule 
will give you the 1-3 distances, if things get really desperate. It would be 
worth looking at pdb2ins. I remember Ian Tickle wrote a program to make 
distance restraints for Restrain from a ligand pub file and I have a copy 
somewhere. The restrain dictionary was similar to the shelx one.

Best wishes, Jon Cooper. [email protected]

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-------- Original Message --------
On 28 Apr 2023, 08:41, StrBio wrote:

> Hello,
>
> Can you suggest how to make isopeptide bond in coot and generate .cif file to 
> refine the structure in phenix?
>
> Also need suggestions to create shelxl topology file for non standard amino 
> acids.
> I used PRODGR before but seems like the sever is down last couple of months. 
> Any alternatives?
>
> Thank you
> Amit
>
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