[ccp4bb] Lysozyme fusion protein-bacteria

2012-02-22 Thread R.Srinivasan
Dear All,    We are working with proteins with a lot of surface hydrophobicity and hence solubility is a big issue. We so far have tried expressing them as fusion proteins.The strategy has yielded soluble protein but most of the protein elutes in the void volume on a gel-filtration colum.

[ccp4bb] Detergent and globular proteins

2010-10-06 Thread R.Srinivasan
Dear all, We work with lipid droplet binding proteins in our group. These proteins behave more like membrane associated proteins, have a very hydrophobic surface and require detergents right from solubilization to crytallization. We use 1% DDM for solubilization, 0.03% DDM t

[ccp4bb] PEG 1000

2010-06-23 Thread R.Srinivasan
Dear All, I have got initial crystals in a condition with PEG 1000. The PEG 1000 stock we had in our lab was rock solid and when i heated it to about 50 degrees for 15 to 20 minutes it became a solution. We thought the compound has got out dated or something like that and bought a bran

[ccp4bb] validating ligand density

2013-03-11 Thread R.Srinivasan
Hello all,     We co-crystallized an inactive variant of our enzyme in the presence of substrate and have determined the structure at 1.85A.     Now, we want to validate the fitting of the ligand into the electron density. We tried validating using the difference map (2Fo-Fc)

Re: [ccp4bb] validating ligand density

2013-03-12 Thread R.Srinivasan
gt;>>>>Although the Twilight program can only look at deposited PDB entries, the >>>>>tips about ligand validation in the paper are very useful. I suggest you >>>>>start from there. >>>>>You can use EDSTATS in CCP4 to