Re: [ccp4bb] FW: endotoxin removal

2012-03-08 Thread Kevin Jin
Sure, we can talk about this off line. -- Kevin On Thu, Mar 8, 2012 at 7:48 PM, Pius Padayatti wrote: > Kevin, > thanks.Sine this is of not much interest to many here > please feel free to go off line in the future. > > The method of dialysis is confusing here. > How can one achieve this by b

Re: [ccp4bb] FW: endotoxin removal

2012-03-08 Thread Pius Padayatti
Kevin, thanks.Sine this is of not much interest to many here please feel free to go off line in the future. The method of dialysis is confusing here. How can one achieve this by buffer exchange? I wonder if an extensive wash of protein on a column would work instead. Pius On Thu, Mar 8, 2012 at

Re: [ccp4bb] X-ray diffraction spot

2012-03-08 Thread Zhijie Li
Was this crystal shot frozen? With new crystals it is always a good idea to take some room temperature shots first to get an idea of how good the diffraction could possibly be. If you shoot the crystals at room temperature and the spots look fine, then the obvious answer is to optimize the freez

Re: [ccp4bb] FW: endotoxin removal

2012-03-08 Thread Kevin Jin
In my case, this method was developed for large quantity sample (~100g/batch) purification. Under cGMP, I could not introduce EDTA or other chemicals like Triton-X100 into the system. Otherwise, I just solve small problem but bring into an even large problem to the manufacture line. I hope you ca

Re: [ccp4bb] FW: endotoxin removal

2012-03-08 Thread Kevin Jin
To Pius, In my case, the protein/biopolymer is Lysine/amine riched. 1. Lys or Arg are mainly positively charged under pH 7.0 ~ 8.0, and then provide positively charge to LPA. Of course, some metal cations could also be involved in LPA binding. 2. Tris with the NH2 group could also be protonated

Re: [ccp4bb] FW: endotoxin removal

2012-03-08 Thread Pius Padayatti
This is in response to a comment to this thread Kevin, Could you explain how that worked? How do you know your method worked? Did you estimate the lipopolysaccharide before and after the method? The method already mentioned here to wash using TritonX100 makes sense. by washing bound protein sample

Re: [ccp4bb] xds - problem with reference profile

2012-03-08 Thread Herman . Schreuder
Dear Florian, Could it be that you only have spots in the center of your image and that XDS is trying to process a lot of image area with only background in it? In this case it will try to build profiles from non-existing reflections and start to complain. The resulting bad data may cause scal

[ccp4bb] xds - problem with reference profile

2012-03-08 Thread Florian Schmitzberger
Dear All, I am getting a warning message in XDS I have not seen before, when trying to integrate a low resolution (~ 7 A) dataset. !!! WARNING !!! REFERENCE PROFILE # 1 IS EMPTY. THE AVERAGE PROFILE IN THIS BATCH IS USED INSTEAD. and so forth for the other reference profile

Re: [ccp4bb] Water

2012-03-08 Thread Uma Ratu
Dear All: I appreciate for your comments and inputs. Thank you Uma On Thu, Mar 8, 2012 at 12:16 AM, Shekhar Mande wrote: > Welljust to add, it has been our contention that many of the metal > ions have been modelled as waters in several structures- due perhaps to the > lack of sufficiently

Re: [ccp4bb] REFMAC Riding Hydrogens

2012-03-08 Thread Martyn Winn
I have changed the GUI default to be MAKE HYDROGEN ALL. This should be in the next release. In any case, the option is in the folder Refinement Parameters, so you can check. m On Wed, 2012-03-07 at 23:45 +, Garib N Murshudov wrote: > Hi > > > 1) refmac's default option has been "generate a

[ccp4bb] Professor Dame Louise Johnson FRS

2012-03-08 Thread Elspeth Garman
Friends and colleagues of Professor Dame Louise Johnson will be very saddened to learn that she suffered a serious and very incapacitating heart attack with complications in August 2011 and has been in hospital since then. Louise is visited daily by members of her family, and, starting very rece

Re: [ccp4bb] setting occupancy for disordered water

2012-03-08 Thread arka chakraborty
Hi all, I apologize for being late in expressing my gratitude. Thanks to Prof. Tim and Prof. Herman, I have fixed the waters and validated the structure. Cheers, ARKO On Wed, Mar 7, 2012 at 8:37 PM, Tim Gruene wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Dear ARKO, > > you can

Re: [ccp4bb] Directories & Projects Spring Cleaning

2012-03-08 Thread Enrico Stura
Mark, I am faced with the same problem. I work under Linux. Since everything depends from the .CCP4 directory, this directory can be copied to a storage location. Example: /oldproj/dotCCP4_2011: /home/user % cp -r .CCP4 /oldproj/dotCCP4_2011 Once this directory has been effectively backed up

Re: [ccp4bb] FW: endotoxin removal

2012-03-08 Thread Taylor, Jonathan D
Dear Jerry, I've just become aware of this spin column to remove endotoxin, marketed by Generon, UK. http://generon.co.uk/index.php?route=product/category&path=238 Good luck, Jon On Wed, Mar 7, 2012 at 9:50 AM, Jerry McCully wrote: > > > Dear All; > >