Re: [ccp4bb] problem with CNS bgroup refinement

2010-07-16 Thread Frederic VELLIEUX
Fred. > Message du 17/07/10 03:37 > De : "hongjunyu" > A : CCP4BB@JISCMAIL.AC.UK > Copie à : > Objet : Re: [ccp4bb] problem with CNS bgroup refinement > > > Dear Fred. and Martyn: > Thank you for your replies. I am new to CNS and I just followed the CNS >

Re: [ccp4bb] problem with CNS bgroup refinement

2010-07-16 Thread Pavel Afonine
Hi, at 2A resolution you do not need to do group B refinement. You might find this helpful in understanding some things about B-factor refinement (pages 24-31): http://www.phenix-online.org/newsletter/CCN_2010_07.pdf Pavel. On 7/16/10 6:30 PM, hongjunyu wrote: > Dear Fred. and Martyn: > Than

Re: [ccp4bb] problem with CNS bgroup refinement

2010-07-16 Thread hongjunyu
Dear Fred. and Martyn: Thank you for your replies. I am new to CNS and I just followed the CNS website protocols. I got your ideas. Since my resolution is 2A, I should skip the bgroup refinement. Hongjun Yu

Re: [ccp4bb] problem with CNS bgroup refinement

2010-07-16 Thread Ed Pozharski
The problem is the unrestrained nature of the grouped b-factor refinement itself. Read this thread http://www.mail-archive.com/ccp4bb@jiscmail.ac.uk/msg14133.html In a nutshell, just stick with (properly wighted) individual B-factors. On Fri, 2010-07-16 at 10:57 -0400, hongjunyu wrote: > Hi, >

[ccp4bb] problem with CNS bgroup refinement

2010-07-16 Thread hongjunyu
Hi, I am using CNS to refine the structure.But when I come to bgroup refinement, the produced bgroup.pdb have many residues with very high B factor. I read the bgroup.inp, and found the item‘B-factor groups'with following description: {* select atoms in group 1 - protein mainchain example *} {==