[ccp4bb] XDS problem

2012-11-10 Thread 秦兴华
Dear CCP4ers, Recently I am trying to process a dataset with XDS program, but during the intergrate and scale procedure it always ended with the following warning: !!! ERROR !!! ASSERT VIOLATION IN "RESTHKL" **

Re: [ccp4bb] model protein for ligand soaking

2012-11-10 Thread Jim Pflugrath
Sucrose co-crystallized in lysozyme is wonderful. I think a soak will crack the crystals, but sometimes not. Here's a pic of electron density from an orthorhombic crystal of lysozyme solved in the recent 2012 CSHL X-ray Methods in Structural Biology course: http://i46.tinypic.com/2e4xk7k.jpg

Re: [ccp4bb] side chain density

2012-11-10 Thread VAN RAAIJ , MARK JOHAN
before modelling a long side-chain in non-existing or dubious density, also make sure it is really there in the protein by sequencing your expression plasmid. Your arginine (for example) may in fact be a serine or glycine...databases are not 100% accurate and neither is PCR if it was used i

Re: [ccp4bb] side chain density

2012-11-10 Thread Ed Pozharski
OK, here we go again. This has been argued ad nauseam, see for example http://www.dl.ac.uk/list-archive-public/ccp4bb/msg19738.html or http://www.mail-archive.com/ccp4bb@jiscmail.ac.uk/msg20268.html (hard to believe we have gone more than a year without another version of "what to do with diso

Re: [ccp4bb] side chain density

2012-11-10 Thread RHYS GRINTER
Hi Guys, I'm dealing with the same issue with a couple of structures at the moment. Matt you said that you like to leave the side chains in a plausible conformation and let refinement deal with the problem. Generally when I try this their backbone geometry gets all bent out of shape in refineme