Hi Lijun, it's not a problem if you use mmCIF or PDB with two-letter chain ID (both supported in Phenix).
Pavel On Mon, Jul 24, 2017 at 5:09 PM, Lijun Liu <lijunli...@gmail.com> wrote: > Hi: this must be an old problem but I would like to know if there are > other ideas to make things easier. > > I solved a structure that contains 240 helices of identical sequences in > the asymmetric unit. Handling so many chains is really a headache as pdb > contains only a single column for chain ID (currently support up to 61 > chains). I had to combine some (say a tetramer) as a single chain for a > trick, which made me use just enough letters/numbers (A-Z,1-9,a-z). > However this will need further manual dealing with OXTs (currently I cheat > with single N of a residue) and raise new problems (like restraints). Some > softwares does even not recognize chain IDs like a-z. SegID might be > another trick however nowadays many softwares won't take that part, so a > down-to-chain rigid body / TLS refinement could be impossible, without the > combination trick. > > With tricks I am ok to make things going? But is there a solution really > solve the many-chain problem with PDB? > > Best, > > Lijun > > > > Sent from my iPhone
