[ccp4bb] ATP binding

2013-01-23 Thread Jan Rashid Umar
Dear All , Could anybody suggest the best possible manner to measure the halflife time of a protein-ATP complex? Our protein binds to ATP and we would like to measure its half life time after it is bound to radiolabelled ATP. Looking forward for your valuable suggestions. Best wishes, Jan

[ccp4bb] crosslinking protein by non-natural amino acids

2012-07-15 Thread Jan Rashid Umar
Dear All, I am interested in cross-linking of a protein molecule with a complex (isolated). The protein is expressed recombinantly from E.coli and we are would like to precisely map the residues involved in interaction. So far, all other crosslinking methods (targeting amines etc.) have not

[ccp4bb] FE-Sulfur proteins

2012-07-11 Thread Jan Rashid Umar
Dear All, I will be grateful to your suggestions about Iron-Sulfur cluster protein purification. My colleague has some problems with the purification and it seems that the iron-sulfur cluster might be deformed, and protein is aggregated. The purification is done under aerobic (normal condition),

[ccp4bb] Disulphide bonds and closed conformation

2012-07-11 Thread Jan Rashid Umar
Dear all, I am working on a protein where I have to stabilize the closed conformation of the protein using disulphide bond. The strategy to design the cysteine mutants is based on the molecular dynamic simulations, and accordingly the residues were chosen. The ultimate goal is to trap the ligand

[ccp4bb] heavy atom clusters

2011-01-31 Thread Jan Rashid Umar
Dear All, I wonder whether it is possible to get some recommendations/suggestions for a new set of powerful heavy atom clusters used to phase macromolecular complexes. Additionally, is anybody familiar whether Pentamethylcyclopentadienyliridium (III) chloride dimer is soluble in water? Your