Re: [ccp4bb] How to compare the same protein crystallized in different conditions?

2024-04-09 Thread Hekstra, Doeke Romke
Hi Murpholino, You could go the route of comparing refined models, as described by Dr. Yorke. As Dr. Dodson describes, isomorphous difference maps are another way to compare datasets. A benefit is that they do not require separate refinement of models for both states, which can render the

Re: [ccp4bb] How to compare the same protein crystallized in different conditions?

2024-04-09 Thread Eleanor Dodson
I like to use difference maps between Fa and Fb .. It is a bit tricky now to set them up..but they do highlight changes. Obviously 1) you need to have the same spacegroup and cell, and the same indexing convention. (Easy to check this in the data processing task when importing the second data

Re: [ccp4bb] How to compare the same protein crystallized in different conditions?

2024-04-09 Thread Briony Yorke
Hi Murpholino, Helen Ginn is developing software to characterise changes in protein structures (especially informative when the changes are small but significant)– there is a web app and a download here: https://rope.hginn.co.uk I recommend watching the youtube tutorial. From: CCP4 bulletin

Re: [ccp4bb] How to compare the same protein crystallized in different conditions?

2024-04-09 Thread Robbie Joosten
Make sure everything is built. Sometimes it is the crystallisation agents that sit at surprising places: https://onlinelibrary.wiley.com/doi/full/10.1002/pro.2923 Cheers, Robbie > -Original Message- > From: CCP4 bulletin board On Behalf Of > Murpholino Peligro > Sent: Tuesday, April

[ccp4bb] How to compare the same protein crystallized in different conditions?

2024-04-08 Thread Murpholino Peligro
Hi... Let's say I want to compare the same protein crystallized in different conditions. Same space group, almost same resolution. The global RMSD will be pretty small (around 0.3 Angstroms). There will be some changes in rotamers in some residues and some extra waters here and there... Besides