Re: [ccp4bb] seeding, reproducibility

2014-01-18 Thread Patrick Shaw Stewart
One or more ingredients in the original hit (which you use to suspend the seed crystals in) can indeed be essential, and may be all you need to get nice crystals. In D'Arcy's original paper you will see that he needed Ca2+ to get nice crystals of one of his proteins. The same is true in

[ccp4bb] Phasing with Many Monomers/AU

2014-01-18 Thread Chris Fage
Hello Everyone, I am currently trying to phase a structure with an asymmetric unit predicted to contain 20-24 monomers (space group P1). The native crystals, while beautiful in appearance (see attached), only diffract to ~3.4-3.0 angstroms at best, and SeMet-derived crystals grow with poor

[ccp4bb] Postdoctoral Fellow in Structural Virology

2014-01-18 Thread Ke
Postdoctoral Fellow in Structural Virology Institute for Molecular Virology University of Minnesota‐Twin Cities Minneapolis, MN 55455 Web: www.virology.umn.edu Description A Postdoctoral Fellow is being sought for a collaboration involving the application of cryo‐electron tomography

[ccp4bb] Cryo-EM postdoctoral position at University of Auckland

2014-01-18 Thread Alok Mitra
Dear Colleagues: Posdoctoral position at the School of Biological Sciences University of Auckland We are seeking a well-qualified and highly motivated candidate for the position of a postdoctoral Research Fellow to carry out structure/function studies of anti-feeding prophage (Afp) using

Re: [ccp4bb] Phasing with Many Monomers/AU

2014-01-18 Thread Scott Thomas Walsh
Hi Chris, It would be nice to have a wee bit more information. Is 3.4-3.0 angstroms from a home source or synchrotron? What are the crystallization conditions for both the native and SeMet crystals? Did you see the SeMet crystals with the native crystals. Have you tried MMS with the native

Re: [ccp4bb] Phasing with Many Monomers/AU

2014-01-18 Thread Francis Reyes
You sure about this space group? 24 monomers in P1 is unusual (at least to me) F On Jan 18, 2014, at 9:14 AM, Chris Fage cdf...@gmail.com wrote: Hello Everyone, I am currently trying to phase a structure with an asymmetric unit predicted to contain 20-24 monomers (space group P1). The

Re: [ccp4bb] Phasing with Many Monomers/AU

2014-01-18 Thread Felix Frolow
Francis, It can happened We have (not yet published) P1 with 24 molecules. When we cut His-tag we get P1 with 32 molecules. In our case we believe it is dictated by very strong interaction between two monomers, and strong interaction between dimers with build a flattish tetramer. Probably