[ccp4bb] Oligomerization state

2013-03-21 Thread Theresa Hsu
Dear all I have a His-tagged membrane protein with unknown oligomerization state. But I am worried that tag addition may induce different state than in native and affect its crystallizability. Is there a single method that can determine the oligomerization state with nearly 100% accuracy? I

Re: [ccp4bb] Oligomerization state

2013-03-21 Thread Raji Edayathumangalam
Dear Theresa, Although I haven't yet done the experiment myself, I am told that microscale thermophoresis (MST) is another useful method for oligomerization measurements, especially since it is designed to work for membrane proteins in presence of detergents etc. If you want to quickly learn more

Re: [ccp4bb] Oligomerization state

2013-03-21 Thread Toufic El Arnaout
Hello Theresa, Maybe a functional assay (if possible) is better than determining the oligomeric state? Why is finding out the oligomeric state (which is unknown anyway and the answer can be compared to nothing), the answer to is having a tag ok? will the protein crystallize? What if the analysis