Re: [ccp4bb] sugar and coot

2011-11-30 Thread Heping Zheng
is 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 00:16

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 the

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