Re: [ccp4bb] simulated annealing omit map

2012-12-07 Thread Chen, Yu Wai
On 07/12/2012 10:43, Appu kumar wrote: Dear Users, I am refining a enzyme structure with ligand. I want to make the simulated annealing omit map of ligand including with 4 Angestron radius around the ligand. I am seeking your valuable advice to help me out. I know how

Re: [ccp4bb] Model submission

2012-06-19 Thread Chen, Yu-Wai
I echo with Nat and support depositing both structures. Despite the fact that the 38 residues are disordered, these are 2 different proteins (chemically). The disordered residues may not lead to a better model, but they do carry information. They are there and still take up physical space, thus

[ccp4bb] Integration of highly anisotropic data

2009-06-19 Thread Chen, Yu Wai
Dear all, I have a data set which is highly anisotropic (3.5-4A in one direction and 2A in the other) and huge amount of scattering in some rotation ranges. I know there is the anisotropic correction server which I can use to do scaling to the weaker data and get it into a kind-of isotropic

Re: [ccp4bb] homology modeling

2009-05-05 Thread Chen, Yu Wai
I would recommend Modeller http://www.salilab.org/modeller/ Wai Suppose I have two proteins A and B, they are structurally homologous, however the sequence identity is only about 20%. A has crystal structure available, so if I want to model protein B, what's the best way to do it? I don't thin

[ccp4bb] O/T: use of heparin in crystallisation

2008-12-17 Thread Chen, Yu Wai
Dear All, Does anybody has any comment on using heparin as an additive to co-crystallise an RNA-binding protein? I am not asking about using it to form a complex with proteins that are know to bind heparin specifically, but using it as a general RNA analogue, when we lack the knowledge of th