[Dock-fans] Unknown Close Contact Warning

Fuhrman, Kit kit.fuhrman at pathology.ufl.edu
Thu Sep 23 08:25:17 PDT 2010


Hi Scott, 
That makes a lot more sense now.  Thanks for looking into it.  In the meantime, I've just flagged the compounds in my analysis.

Kit

On Sep 23, 2010, at 3:27 AM, Scott Brozell wrote:

> Hi,
> 
> On Tue, Sep 14, 2010 at 11:36:53AM -0400, Fuhrman, Kit wrote:
>> I'm re-scoring my compounds with the Amber score.  Some of my ligands display an error in the amberize_ligand log
>> 
>> "Warning: Close contact of 0.618328 angstroms between .R<<0> 1>.A<H24 37> and .R<<0> 1>.A<H28 44>"
>> 
>> The problem is that when I measure the distance between the atoms, H24 and H28, the distance is not even close to .618328.  In this case it's 0.786114712.  This happens for quite a number of ligands.  When I view the mol2 in chimera or pymol, I can't find anything terribly wrong with the molecules.  If I ignore the errors, I get a reasonable amber score.
>> 
>> I've attached the ligand.  Has anyone seen this before?  Any suggestions on how to zero in on the cause?
> 
> The close contact reported is actually the square of the distance:
> sqrt(0.618328) = 0.786
> At the very least the warning should be clearer, but this may be a
> legacy issue within Amber.  I'll investigate.
> 
> Scott
> 








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