Re: [ccp4bb] Can I refine the B values only for the modified/added structure while keeping already refined B values unchanged?

2010-08-15 Thread Hailiang Zhang
Dear Pavel: Thanks a lot! I will try phenix.refine! Best Regards, Hailaing > Hi Hailiang, > > you didn't specify which program you are using... > > For example, you can do it in phenix.refine: > > phenix.refine model.pdb data.mtz strategy=individual_adp > adp.individual.iso="chain A and resseq

Re: [ccp4bb] Method to calculate the axis of an alpha helix

2010-08-15 Thread Edwin Pozharski
Interhlx may be what you are looking for http://nmr.uhnres.utoronto.ca/ikura/resources/data+sw/interhlx/ > Dear all, >I want to compare the conformational change of two similar structures, > using one alpha helix as the reference. Then, how can I get a vector that > can represent both the

Re: [ccp4bb] Can I refine the B values only for the modified/added structure while keeping already refined B values unchanged?

2010-08-15 Thread Pavel Afonine
Hi Hailiang, you didn't specify which program you are using... For example, you can do it in phenix.refine: phenix.refine model.pdb data.mtz strategy=individual_adp adp.individual.iso="chain A and resseq 123" which will refine isotropic ADPs for residue number 123 in chain A only, or pheni

[ccp4bb] Can I refine the B values only for the modified/added structure while keeping already refined B values unchanged?

2010-08-15 Thread Hailiang Zhang
Hi there: For a PDB with B values refined, if I modify/addto its local structure (mutation, add 1 residue...), is there any way I can refine the B values only for the modified/added structure while keeping already refined B values unchanged? Thanks! Best Regards, Hailiang

Re: [ccp4bb] Method to calculate the axis of an alpha helix

2010-08-15 Thread Phil Evans
I don't know of any standard programs that do this, but I have a couple of programs that do this sort of thing, using a "standard" helix as a reference and the clipper libraries. I could send you the code if you like, though you'd probably have to hack them to do exactly what you want (I found t

[ccp4bb] Method to calculate the axis of an alpha helix

2010-08-15 Thread 商元
Dear all, I want to compare the conformational change of two similar structures, using one alpha helix as the reference. Then, how can I get a vector that can represent both the position and direction of the helix? Is there any well-known software can do this? Or, should I build a cylinder mo