[ccp4bb] How to improve the density of another molecule in Asymmetric unit

2008-01-16 Thread Sun Tang
Hello Everyone, I have a question about how to improve the electron density. I have two indepedent molecules in the asymmetric unit (1.9 A resolution). I solved the structure with PHASER and refined with CCP4i (Rfree = 0.29). For the first molecule, the density is very good, but for

Re: [ccp4bb] How to improve the density of another molecule in Asymmetric unit

2008-01-16 Thread Gerard DVD Kleywegt
ni hao, I have a question about how to improve the electron density. I have two indepedent molecules in the asymmetric unit (1.9 A resolution). I solved the structure with PHASER and refined with CCP4i (Rfree = 0.29). For the first molecule, the density is very good, but for the second

Re: [ccp4bb] How to improve the density of another molecule in Asymmetric unit

2008-01-16 Thread Lijun Liu
First you cannot normally expect two in the same AU have the same structure, so an over-weighted averaging may cause bias. It is likely that a rigid-body refinement down to two molecules or even domains may help improve in your case. On Jan 16, 2008, at 8:47 AM, Sun Tang wrote: Hello