NDLI: Hydrophilic residues 526 KNDAAD 531 in the flexible C-terminal region of the chaperonin GroEL are critical for substrate protein folding within the central cavity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Machida, Kodai Hongo, Kunihiro Kawata, Yasushi Mizobata, Tomohiro Kono-okada, Akane
Description	Author Affiliation: Machida K ( Department of Biotechnology, Faculty of Engineering, Graduate School of Medical Science, Tottori University, Koyama-Minami, Tottori 680-8552, Japan.)
Abstract	The final 23 residues in the C-terminal region of Escherichia coli GroEL are invisible in crystallographic analyses due to high flexibility. To probe the functional role of these residues in the chaperonin mechanism, we generated and characterized C-terminal truncated, double ring, and single ring mutants of GroEL. The ability to assist the refolding of substrate proteins rhodanese and malate dehydrogenase decreased suddenly when 23 amino acids were truncated, indicating that a sudden change in the environment within the central cavity had occurred. From further experiments and analyses of the hydropathy of the C-terminal region, we focused on the hydrophilicity of the sequence region (26 KNDAAD 531 and generated two GroEL mutants where these residues were changed to a neutral hydropathy sequence (526 GGGAAG 531) and a hydrophobic sequence (526 IGIAAI 531), respectively. Very interestingly, the two mutants were found to be defective in function both in vitro and in vivo. Deterioration of function was not observed in mutants where this region was replaced by a scrambled (526 NKADDA 531) or homologous (526 RQEGGE 531) sequence, indicating that the hydrophilicity of this sequence was important. These results highlight the importance of the hydrophilic nature of 526 KNDAAD 531 residues in the flexible C-terminal region for proper protein folding within the central cavity of GroEL.
ISSN	00219258
e-ISSN	1083351X
Journal	Journal of Biological Chemistry
Issue Number	11
Volume Number	283
Language	English
Publisher	American Society for Biochemistry and Molecular Biology (United States)
Publisher Date	2008-03-14
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Chaperonin 60 Chemistry Adenosine Triphosphatases Amino Acid Sequence Anilino Naphthalenesulfonates Chaperonins Circular Dichroism Escherichia Coli Metabolism Fluorescent Dyes Pharmacology Models, Biological Molecular Conformation Molecular Sequence Data Mutation Protein Folding Protein Structure, Tertiary Substrate Specificity Research Support, Non-U.S. Gov't Biochemistry Molecular Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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