Re: [ccp4bb] sugar and coot

2011-11-30 Thread Heping Zheng
defined in LINKR record. The same applies when I want to refine just A502-A504 alpha1,6 glycosidic bond without refine A503. I am just wondering what is the state of the art for branch chain handling in coot or another interactive refinement program. best regards, Heping Zheng > On 22/11/11 00

Re: [ccp4bb] Crystalization in low PH

2011-11-07 Thread Heping Zheng
I remembered that people had crystallize a series of streptavidin-2-iminobiotin structures at a low pH. If it might help, check the following PDBIDs: 2RTD 2RTE 2RTI 2RTK 2RTL > Hi everyone > > I have a protein that is extraordinarily stable at PH=3.0 or even 2.0. > > I want to crystallize it in

Re: [ccp4bb] disulfide bond question

2011-04-05 Thread Heping Zheng
Ronnie -- The list that I have in a home database contains 89 instances of a CXC in 53 files when C-C forms a disulfide bond. The records returned are ordered by the name of "X" residue from CXC motif for convenience. There is indeed PRO in one case (2zxt), but it is not the major observation in

Re: [ccp4bb] metal binds?

2011-03-25 Thread Heping Zheng
If you want to use absorption spectroscopy, it depends on whether or not the heavy atom under investigation have significant absorption at the X-ray wavelength you have at home lab. If that is the case, you should be able to see the absorption and tell whether or not the heavy atom has been inco