Re: [ccp4bb] Refinement of anisotropic data

2008-05-21 Thread yang li
Hi, All, Thanks for all your replies. I checked the server as Pavel said, and found that the 2.3A data has strong anisotropy and other two has severe anisotropy. The recommend resolution cutoff in the c axis is only 3.4A. I need to read more about the manual but I think this is the problem. Ho

Re: [ccp4bb] Refinement of anisotropic data

2008-05-20 Thread Anastassis Perrakis
On 21 May 2008, at 7:00, yang li wrote: Hi, I have a structure with 3 different resolutions, 2.3A, 2.4A, 2.5A, the qualities seem normal, not good but also not too bad. The B factors along a,b,c axis have notable difference, for example B(a)=80, B(b)=30, B(c)=20. We used molecular replac

Re: [ccp4bb] Refinement of anisotropic data

2008-05-20 Thread Ethan A Merritt
On Tuesday 20 May 2008 22:24, Pavel Afonine wrote: I agree with Pavel - it is suspicious that TLS refinement would increase Rfree. That really shouldn't happen. Are your 3 data sets are truly isomorphous, or could it be that the one with the bad R factors is really in a lower symmetry space grou

Re: [ccp4bb] Refinement of anisotropic data

2008-05-20 Thread Pavel Afonine
Hi Yang Li, - the data-to-parameters ratio is not good for individual anisotropic ADP refinement at this resolution; - I'm wondering why TLS refinement increases the Rfree... How did you select the TLS groups? Did you try to use TLSMD for this (thanks Ethan, it produces TLS groups selections r

[ccp4bb] Refinement of anisotropic data

2008-05-20 Thread yang li
Hi, I have a structure with 3 different resolutions, 2.3A, 2.4A, 2.5A, the qualities seem normal, not good but also not too bad. The B factors along a,b,c axis have notable difference, for example B(a)=80, B(b)=30, B(c)=20. We used molecular replacement to solve the structure. For the 2.3A data