ATP binding is critical for the conformational change from an open to closed state in archaeal group II chaperonin - PubMed (original) (raw)
. 2003 Nov 7;278(45):44959-65.
doi: 10.1074/jbc.M305484200. Epub 2003 Aug 14.
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- PMID: 12920124
- DOI: 10.1074/jbc.M305484200
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ATP binding is critical for the conformational change from an open to closed state in archaeal group II chaperonin
Ryo Iizuka et al. J Biol Chem. 2003.
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Abstract
Group II chaperonins, found in archaea and in eukaryotic cytosol, do not have a co-chaperonin corresponding to GroES. Instead, it is suggested that the helical protrusion extending from the apical domain acts as a built-in lid for the central cavity and that the opening and closing of the lid is regulated by ATP binding and hydrolysis. However, details of this conformational change remain unclear. To investigate the conformational change associated with the ATP-driven cycle, we conducted protease sensitivity analyses and tryptophan fluorescence spectroscopy of alpha-chaperonin from a hyperthermophilic archaeum, Thermococcus strain KS-1. In the nucleotide-free or ADP-bound state, the chaperonin, especially in the helical protrusion region, was highly sensitive to proteases. Addition of ATP and ammonium sulfate induced the transition to the relatively protease-resistant form. The fluorescence intensity of the tryptophan residue introduced at the tip of the helical protrusion was enhanced by the presence of ATP or ammonium sulfate. We conclude that ATP binding induces the conformational change from the lid-open to lid-closed form in archaeal group II chaperonin.
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