Re: [ccp4bb] 250 kDa standard

2011-02-20 Thread Artem Evdokimov
If you notice, I did not say 250 kDa DNA. It will have to be a shorter DNA, that *behaves* on size exclusion like a 250 kDa protein. I once worked out the ratio, but don't remember what it ended up being, anymore :) The advantage is that you can get these standards easily enough in a huge range of

Re: [ccp4bb] 250 kDa standard

2011-02-20 Thread Filip Van Petegem
But this wouldn't correspond to a globular form; 250kDa DNA will appear larger than a 250kDa globular protein. On Sat, Feb 19, 2011 at 5:25 PM, Artem Evdokimov wrote: > A sufficiently long piece of DNA works OK. > > > On Sat, Feb 19, 2011 at 6:47 PM, Alexandra Deaconescu < > deac...@brandeis.edu

Re: [ccp4bb] 250 kDa standard

2011-02-19 Thread Kushol Gupta
Pennsylvania School of Medicine kgu...@mail.med.upenn.edu 215-573-7260 / 267-259-0082 -Original Message- From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Alexandra Deaconescu Sent: Saturday, February 19, 2011 7:47 PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] 250 kDa standard

Re: [ccp4bb] 250 kDa standard

2011-02-19 Thread Artem Evdokimov
A sufficiently long piece of DNA works OK. On Sat, Feb 19, 2011 at 6:47 PM, Alexandra Deaconescu wrote: > Dear ccp4bb enthusiasts: > > A question unrelated to ccp4: can anyone recommend a good 250 kDa standard > for gel filtration that is commercially available? It could be a single > polypeptid

[ccp4bb] 250 kDa standard

2011-02-19 Thread Alexandra Deaconescu
Dear ccp4bb enthusiasts: A question unrelated to ccp4: can anyone recommend a good 250 kDa standard for gel filtration that is commercially available? It could be a single polypeptide or an oligomer too... Thanks a lot! Bests, Alex