Re: [ccp4bb] PHASER MR solution

2015-01-28 Thread Randy Read
Hi all, Actually, what I think has happened here is that Phaser has limited the resolution to what it estimated was needed to get a clear enough solution, and then the final refinement was carried out with all the data. The signal-to-noise is lower with limited data, but it’s a price that

Re: [ccp4bb] PHASER MR solution

2015-01-28 Thread Roger Rowlett
The Z-values may be marginal, but of course you should inspect the solution in Coot to see if the electron density makes sense, and the packing of the protein molecules in the unit cell (look at symmetry mates) is sensible. If this passes the sniff test, then you should clean up your model

Re: [ccp4bb] PHASER MR solution

2015-01-28 Thread Matthew Franklin
Hi Jeorge - Something seems to have changed for the worse in this MR run. In your earlier posting, where you failed to find a solution in P222, your log file had solutions with RFZ=23.4, generally a clear indication of a correct rotation function solution. (You didn't include this log file

Re: [ccp4bb] PHASER MR solution

2015-01-27 Thread jeorgemarley thomas
Thank you so much to all for your kind concern. Jeorge On Mon, Jan 26, 2015 at 5:55 PM, Kay Diederichs kay.diederi...@uni-konstanz.de wrote: Dear Jeorge, you'll find some information about this in http://strucbio.biologie.uni-konstanz.de/xdswiki/index.php/Space_group_determination . A

Re: [ccp4bb] PHASER MR solution

2015-01-26 Thread Kay Diederichs
Dear Jeorge, you'll find some information about this in http://strucbio.biologie.uni-konstanz.de/xdswiki/index.php/Space_group_determination . A practical and easy way is described in http://strucbio.biologie.uni-konstanz.de/xdswiki/index.php/Pointless HTH, Kay On Mon, 26 Jan 2015 11:24:27

Re: [ccp4bb] PHASER MR solution

2015-01-26 Thread Tim Gruene
Dear Jeorge, XDS make no claim to determine the SPACE GROUP but rather the LAUE GROUP, as only the latter is taken into account during data integration. This is definitely so during the indexing step (IDXREF.LP), but even in CORRECT, when systematic absences are sometimes indicated, XDS does not

Re: [ccp4bb] PHASER MR solution

2015-01-26 Thread Randy Read
Dear Jeorge, I can’t see anything in that output saying whether the systematic absences that would allow you to detect screw axes were covered in your data collection. In any case, it’s not necessary to reintegrate. All that happens when going from P222 to any one of the other 7 possible