In case it helps… After you've done unrestrained refinement, you can use 
prosmart to generate external self-restraints to the current conformation 
(using the -self_restrain keyword). This is flexible - you can specify residue 
ranges, and it works for protein, ligand, DNA/RNA, waters, etc. These external 
restraints will attempt to maintain the original relative conformation 
throughout refinement. If you want any help doing this, feel free to email me 
off-board.

Cheers,
Rob


On 12 Sep 2012, at 21:11, Edwin Pozharski wrote:

> You can do unrestrained refinement in refmac, at your resolution it may be 
> OK.   If you want to keep protein restrained, you can either use harmonic 
> restraints or come up with a special cif-file for your ligand with large esd 
> targets.  There is no direct way to tell refmac to exclude specific residue 
> from restraints, at least to my knowledge.
> 
> Cheers,
> 
> Ed.
> 
> On 09/12/2012 02:44 PM, Yuri Pompeu wrote:
>> What is the best way to refine the ligand unrestrained and then generate 
>> measurements?

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