Dear Eleanor,
Thank you very much for your reply. I think that the NCS operator is very close
to the crystallographic two fold symmetry because when I searched for the
solution with PHASER with one molecule as the model I could not find the
solution so I have to use two molecules as the search model but I did
not expect that will affect the NCS refinement. How to deal with this problem?
Thank you very much for your great help! I also greatly appreciated all the
replies to my question which help me clarify a lot.
Thank you All!
Best wishes,
Sun
________________________________
From: Eleanor Dodson <c...@ysbl.york.ac.uk>
To: Sun Tang <suntang2...@yahoo.com>
Cc: CCP4BB@jiscmail.ac.uk
Sent: Wednesday, July 8, 2009 10:06:41 AM
Subject: Re: [ccp4bb] Why NCS doesn't help?
There are many reasons why this could have ocurred.
One is that your NCS operator is very close to being a crystallographic
one.
But you need to give more details of the problem before I can comment
sensibly
Eleanor
Sun Tang wrote:
> Dear All,
>
> In refining my structure (two molecules in au) that was solved with molecular
> replacement, refinement starting with restrained lowered the R-free to about
> 0.35 while with NCS increased the R-free to 0.55. Does it imply that two
> molecules are quite different or something wrong with the refinement?
>
> Thank you very much for your suggestions?
>
> Best wishes,
>
> Sun Tang
>
>
>
>
>
