why don't you read in that chain in Coot and run the find ligand option with 
flexible ligand turned on and select that 6kDa ligand ? You should also choose 
Fo-Fc map to fit the ligand to maybe at 2.7 sigma. You might have to split up 
the ligand into pieces, not sure what the limitations in Coot/Find Ligand are.

You already have a MR solution of the rest of your protein right ? So you are 
just asking how to make your life easier to not built de novo 45-50 residues ?

Jürgen

On Oct 19, 2011, at 10:00 AM, Ed Pozharski wrote:

Why not do the molecular replacement - 6kDa is rather small but it most
likely will work

On Wed, 2011-10-19 at 06:13 -0700, Afshan Begum wrote:
Hello CCP4 user


I have collected a data set 2.1 for my complex. Actually after  first
run of Rafmac i can see the density for my inhibitor but the problem
is my inhibitor is 6 KDa and i know the sequence of my inhibitor as
well this inhibitor already crystallize with other protein molecule
present in PDB data bank so how can i put in to that electron density
i mean are there any ways to combine two Pdb in one molecule?



I would be thankful for your help




Best Regards

AFSHAN








--
Oh, suddenly throwing a giraffe into a volcano to make water is crazy?
                                               Julian, King of Lemurs

......................
Jürgen Bosch
Johns Hopkins University
Bloomberg School of Public Health
Department of Biochemistry & Molecular Biology
Johns Hopkins Malaria Research Institute
615 North Wolfe Street, W8708
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Office: +1-410-614-4742
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