[BiO BB] (no subject)
Dan Bolser
dmb at mrc-dunn.cam.ac.uk
Tue Oct 25 03:53:58 EDT 2005
Laura Nielson wrote:
> Why is it not possible to spool out precipitated proteins in comparison
> to spooling out precipitated DNA? DNA is very, very long. How long are
> proteins (polypeptides)?
>
> I've done the experiment where you precipitate DNA out of onion cells.
> Could you precipitate RNA out of onion cells? How? or Why not?
One reason is the ubiquity of RNAses. Anyone working with RNA will tell
you what a pain it is, as any RNA 'out there' will be sliced up faster
than you an do anything else.
I have no idea of average RNA lengths, but typically *much* shorter than
DNA. They will be (approximately) three times the length of proteins,
and the longest protein is ~12,000 amino acids AFAIR.
Proteins do precipitate all the time. The nack is to precipitate exactly
the protein you want, and none of the proteins you don't want.
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