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Stabilization of a compact conformation of monomeric GroEL at low temperature by adenine nucleotides.

Lissin, N M; Hemmingsen, S M.
FEBS Lett; 324(1): 41-4, 1993 Jun 07.
Artigo em Inglês | MEDLINE | ID: mdl-8099330
E. coli GroEL chaperonin monomers, isolated after urea-induced dissociation of GroEL14, undergo cold denaturation below 5 degrees C. Above 5 degrees C, these monomers undergo MgATP-dependent self-assembly. We have demonstrated a conformational transition at 0 degree C induced by interaction of monomeric GroEL with adenine nucleotides. This conformation has a dramatically decreased Stokes radius and enhanced resistance to trypsin but it is slightly less compact than the conformation of monomers at 23 degrees C in the absence of MgATP and it is not capable of spontaneous self-assembly. A second, temperature-dependent conformational change with a transition at about 5 degrees C is required for GroEL to undergo oligomerization.
Selo DaSilva