Re: [ccp4bb] ATP solution

2010-08-29 Thread Carlos Huerta
If you are using malachite green assay, there will be an issue with the solution turning green at high ATP concentrations. There is a protocol to reduce ATP hydrolysis after the addition of malachite green (http://www.ncbi.nlm.nih.gov/pubmed/16674910). An alternative to malachite green assay is

Re: [ccp4bb] Manipulating electron density

2009-05-11 Thread Carlos Huerta
s will look lovely too if you just touch them up with with some white-out and a sharpie. Do the honest thing and show the whole truth, using the z-clipping to get a comprehensible slab. Original message >Date: Sat, 9 May 2009 18:53:35 -0500 >From: Carlos Huerta >Subject

Re: [ccp4bb] Manipulating electron density

2009-05-09 Thread Carlos Huerta
Hi Jason, If you already created a .map from CCP4 and changed the extension to .ccp4. Then, to create a map in PyMol for your protein only is the following. create chainA, (chain A & pdb name) #I think you can leave out the pdb name isomesh mesh1, your map, 1.0, (chainA), carve=1.5 If th

Re: [ccp4bb] Summary crystallisation of an extremely soluble protein

2007-02-22 Thread Carlos Huerta
This may sound like hocus-pocus but it worked for me and may work in other conditions. Try chilling your solution in ice, or prepare your plate with reservoir solution and chill the plate in a tub of ice (surround the plate with ice, do not place the plate on top of the ice). Finishing setting

Re: [ccp4bb] Anisotropic Refinement Question

2007-02-19 Thread Carlos Huerta
Dear All, I appreciate the feed back from my question. I refined anisotropically without hydrogens and when I was satisfied with the model I added hydrogens with zero refinement cycles in REFMAC5. This worked equally well as adding hydrogens earlier in the refinement stage and keeping them pr

[ccp4bb] Anisotropic Refinement Question

2007-02-11 Thread Carlos Huerta
Dear Everyone, I have performed an anisotropic restrained refinement in REFMAC5 with hydrogens added, and later read there is no need to refine the hydrogens anisotropically. Is there a way to refine all atoms anisotropically except hydrogens in REFMAC5? I would like to keep the hydrogens dur