Re: [ccp4bb] CNS refinement problem

2008-09-06 Thread Axel Brunger
This sounds to me like a compiler problem on your machine. Try using the latest Intel Ifort, Portland Group pgf95, or GFORTRAN compiler. Axel Brunger On Sep 12, 2008, at 2:56 AM, jxqi wrote: Dear ccp4bbs, When I was refining a protein structure using the rigid.inp in CNS(Version 1.21), an

Re: [ccp4bb] Protein Color

2008-09-06 Thread Filip Van Petegem
Hello Matt, did you use a nickel (or similar) affinity column in the purification + is there any beta-mercaptoethanol or DTT in your sample? Nickel can easily 'bleed' off the column and will turn brown when complexed with bME or DTT - this complex can get quite large and even insoluble if enough

Re: [ccp4bb] Protein Color

2008-09-06 Thread Joe Cockburn
Hi Matt, I sometimes see a similar thing with my proteins, which definitely don't possess metal co-factors or prosthetic groups. I found that gel filtration got rid of it - the browny-yellow stuff came out in the void fraction so I figured it was aggregated protein. I think it was aggregation via t

[ccp4bb] CNS refinement problem

2008-09-06 Thread jxqi
Dear ccp4bbs, When I was refining a protein structure using the rigid.inp in CNS(Version 1.21), an error occured saying that the asymmetric map unit is incompatible with the symmetry operator.The model I used was first refined by the Rafmac5.I had met the same problem when I tried to add water