The unfolding action of GroEL on a protein substrate.
A molecular dynamics simulation of the active unfolding of denatured rhodanese by the chaperone GroEL is presented. The compact denatured protein is bound initially to the cis cavity and forms stable contacts with several of the subunits. As the cis ring apical domains of GroEL undergo the transition from the closed to the more open (ATP-bound) state, they exert a force on rhodanese that leads to the increased unfolding of certain loops. The contacts between GroEL and rhodanese are analyzed and their variation during the GroEL transition is shown. The major contacts, which give rise to the stretching force, are found to be similar to those observed in crystal structures of peptides bound to the apical domains. The results of the simulation show that multidomain interactions play an essential role, in accord with experiments. Implications of the results for mutation experiments and for the action of GroEL are discussed.
van der Vaart
Arjan
A
Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur, 67000 Strasbourg, France.
Ma
Jianpeng
J
Karplus
Martin
M
D001665:Binding Sites / Q000502:physiology; D018834:Chaperonin 60 / Q000737:chemistry*; D003198:Computer Simulation; D004926:Escherichia coli / Q000737:chemistry; D008958:Models, Molecular; D009154:Mutation / Q000235:genetics; D017510:Protein Folding; D017434:Protein Structure, Tertiary / Q000502:physiology; D021122:Protein Subunits / Q000737:chemistry; D013884:Thiosulfate Sulfurtransferase / Q000737:chemistry*
D018834:Chaperonin 60; D021122:Protein Subunits; D013884:Thiosulfate Sulfurtransferase