Re: [ccp4bb] S-200 buffer-based peak shift?

2011-03-22 Thread Lieh Yoon Low
Jacob, Some protein can form weak dimer, especially in low salt buffer. AUC can provide a more detailed info about your protein dimerization state. Ray On Mar 22, 2011, at 8:23 PM, Jacob Keller wrote: > Dear Crystallographers, > > I have run my protein-peptide complex several times on a GE

[ccp4bb] PreScission Protease protein sequence

2011-05-25 Thread Lieh Yoon Low
Dear All, I apologize for a non-crystallography question, but does anyone know the sequence of the PreScission Protease? I would like to make it for use in my own lab. It is just too expensive to purchase from GE! Thanks ray

Re: [ccp4bb] PreScission Protease protein sequence

2011-05-25 Thread Lieh Yoon Low
to ask around! Thanks again ray > - Original Message - > From: "Lieh Yoon Low" > To: CCP4BB@JISCMAIL.AC.UK > Sent: Wednesday, May 25, 2011 1:36:10 PM GMT -08:00 US/Canada Pacific > Subject: [ccp4bb] PreScission Protease protein sequence > > Dear

Re: [ccp4bb] Advice on Over-expressing and Purifying Metalloproteins

2010-05-04 Thread Lieh Yoon Low
Buz, How big is the protein? How many metal binding sites are there? Do you know what metal it should bind? What is your media? I am assuming it is a zinc binding protein, some zinc binding protein will not fold without enough zinc in the media. Perhaps you should not rule out refolding. ray

Re: [ccp4bb] about SUPEROSE 6 PG XK 16/70

2010-06-28 Thread Lieh Yoon Low
Flow rate 0.5 to 1 ml/min Column volume ~120ml Void volume ~50ml On Jun 28, 2010, at 9:40 PM, Jiamu Du wrote: > Hi, everyone > Sorry for a non-ccp4 question. I am running a superose 6 PG XK 16/70 column > from GE. But I can not find any technical information about this column, such > as dead

Re: [ccp4bb] Removing PEG3350

2014-08-20 Thread Lieh Yoon Low
I agree with Alex and Roger. Just a matter of choosing the right SEC column. Ray Lieh Yoon Low > On Aug 20, 2014, at 4:56 PM, Alexander Aleshin > wrote: > > The efficiency of a size exclusion column is proportional to the number of > theoretical plates (plate number). >

Re: [ccp4bb] Removing PEG3350

2014-08-20 Thread Lieh Yoon Low
Millipore equipment is few hundred ml, not sure if there is anything that can handle a few ml volume. Ray Lieh Yoon Low > On Aug 20, 2014, at 6:38 PM, Alexander Aleshin > wrote: > > I agree with Alex and Roger. > But my mentioning of plates number for a concentrato