1QVR

Crystal Structure Analysis of ClpB

Summary for 1QVR

• Entry DOI: 10.2210/pdb1qvr/pdb
• Descriptor: ClpB protein, PLATINUM (II) ION, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER (3 entities in total)
• Functional Keywords: coiled coil, aaa atpase, chaperone
• Biological source: Thermus thermophilus
• Cellular location: Cytoplasm (Probable): Q9RA63
• Total number of polymer chains: 3
• Total formula weight: 296681.43

Authors

Lee, S.,Sowa, M.E.,Watanabe, Y.,Sigler, P.B.,Chiu, W.,Yoshida, M.,Tsai, F.T.F. (deposition date: 2003-08-28, release date: 2003-10-21, Last modification date: 2024-02-14)

Primary citation

Lee, S.,Sowa, M.E.,Watanabe, Y.,Sigler, P.B.,Chiu, W.,Yoshida, M.,Tsai, F.T.F.
The Structure of ClpB: A Molecular Chaperone that Rescues Proteins from an Aggregated State
Cell(Cambridge,Mass.), 115:229-240, 2003

PubMed Abstract: Molecular chaperones assist protein folding by facilitating their "forward" folding and preventing aggregation. However, once aggregates have formed, these chaperones cannot facilitate protein disaggregation. Bacterial ClpB and its eukaryotic homolog Hsp104 are essential proteins of the heat-shock response, which have the remarkable capacity to rescue stress-damaged proteins from an aggregated state. We have determined the structure of Thermus thermophilus ClpB (TClpB) using a combination of X-ray crystallography and cryo-electron microscopy (cryo-EM). Our single-particle reconstruction shows that TClpB forms a two-tiered hexameric ring. The ClpB/Hsp104-linker consists of an 85 A long and mobile coiled coil that is located on the outside of the hexamer. Our mutagenesis and biochemical data show that both the relative position and motion of this coiled coil are critical for chaperone function. Taken together, we propose a mechanism by which an ATP-driven conformational change is coupled to a large coiled-coil motion, which is indispensable for protein disaggregation.

PubMed: 14567920
DOI: 10.1016/S0092-8674(03)00807-9

Experimental method

X-RAY DIFFRACTION (3 Å)