Re: [ccp4bb] Refmac and metal on a two-fold?

2012-01-02 Thread Herman . Schreuder
Dear Ed, I thought the clumsy way of handling special positions you describe was abandoned after the Xplor days, that even rounding errors could cause special atoms to fly apart, but you may be right. The Mn ion might not really be special, but might have two minima, one closer to one protein mole

Re: [ccp4bb] MERGING THREE DATASETS

2012-01-02 Thread Eleanor Dodson
If you still have the input to scalepack you can rerun it to get an unmerged file for both sets of data.. You dont need to change the SG unless of course there is a different indexing convention for the sets.. pointless should handle that - you can generate a mtz file for each data set, then

Re: [ccp4bb] Refmac and metal on a two-fold?

2012-01-02 Thread George M. Sheldrick
I am surprised that this is such a mess. Small molecule crystallographers frequently encounter special positions and have been able to handle them correctly for many years. A well known small molecule refinement program that I don't need to advertise here has been able to generate the special posit

Re: [ccp4bb] refmac low resolution REMARK

2012-01-02 Thread Ian Tickle
Hi Bernhard So what's new? See http://ccp4bb.blogspot.com/2011/11/pdb-header-info-wrong.html (17-Nov-11). Cheers -- Ian On 2 January 2012 06:58, Bernhard Rupp (Hofkristallrat a.D.) wrote: > Dear Developers, > > it seems to me that at least Refmac 5.6.0117 does not report the actual > lowest

Re: [ccp4bb] Refmac and metal on a two-fold?

2012-01-02 Thread Herman . Schreuder
Dear George, I think for small molecules the situation is much easier as for proteins. With small molecules, the resolution of the data is in general much higher and a water or metal ion will force the small molecules in such a position that the special position is exact. With proteins, the water

Re: [ccp4bb] refmac low resolution REMARK

2012-01-02 Thread Bernhard Rupp (Hofkristallrat a.D.)
> So what's new? Alzheimer's and late night senile dementia :-) BR PS: nice site! -Original Message- From: Ian Tickle [mailto:ianj...@gmail.com] Sent: Monday, January 02, 2012 4:34 AM To: b...@hofkristallamt.org Cc: CCP4BB@jiscmail.ac.uk Subject: Re: [ccp4bb] refmac low resolution RE