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No.1582-4 - 2013/03/29 (金) 02:01:48 - おお |
Repeated freeze-thaw cycles of pu-
rified CP promote the unrepressed conformation [un-
published observations]. Mild chemical treatments, such
as exposure to low ionic strength or to levels of sodium
dodecylsulfate (SDS) are effective as well. Low ionic
strength of solution, small hydrophobic peptides, min-
utes amount of detergents or specific mutations in chan-
nel gating residues can enhance peptide hydrolysis by
free-standing 20S CP [9, 15, 22, 31, 32, 34]. It is pre-
sumed that all these treatments promote disordering in
channel blocking residues, thus facilitating substrate en-
try. Under physiological conditions, however, it appears
that the greater part of free core particles are found nat-
urally in the closed state.
http://download.springer.com/static/pdf/731/art%253A10.1007%252Fs00018-004-4131-y.pdf?auth66=1365536657_234757537b9c1c93f03a4e518da19f84&ext=.pdf
K
eepers at the final gates: regulatory complexes and gating
of the proteasome channel
M. Bajorek and M. H. Glickman *
CMLS, Cell. Mol. Life Sci. 61 (2004) 1579 – 1588
1420-682X/04/131579-10
DOI 10.1007/s00018-004-4131-y
© Birkhäuser Verlag, Basel, 200
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