title: Stabilization of a compact conformation of monomeric GroEL at low temperature by adenine nucleotides.
abstract: 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.
authors.affiliation: Institute of Protein Research, Academy of Sciences of Russia, Pushchino, Moscow Region.
authors.forename: N M
authors.initials: NM
authors.lastname: Lissin
authors.forename: S M
authors.initials: SM
authors.lastname: Hemmingsen
mesh_terms: D000227:Adenine Nucleotides / Q000494:pharmacology*; D000244:Adenosine Diphosphate / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000031:analogs & derivatives / Q000494:pharmacology; D001426:Bacterial Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D018834:Chaperonin 60; D003080:Cold Temperature; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006360:Heat-Shock Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D008274:Magnesium / Q000494:pharmacology; D011487:Protein Conformation; D011489:Protein Denaturation
chemical_list: D000227:Adenine Nucleotides; D001426:Bacterial Proteins; D018834:Chaperonin 60; D006360:Heat-Shock Proteins; C022571:adenosine 5'-O-(3-thiotriphosphate); D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D008274:Magnesium