title: The structure of ClpP at 2.3 A resolution suggests a model for ATP-dependent proteolysis.
abstract: We have determined the crystal structure of the proteolytic component of the caseinolytic Clp protease (ClpP) from E. coli at 2.3 A resolution using an ab initio phasing procedure that exploits the internal 14-fold symmetry of the oligomer. The structure of a ClpP monomer has a distinct fold that defines a fifth structural family of serine proteases but a conserved catalytic apparatus. The active protease resembles a hollow, solid-walled cylinder composed of two 7-fold symmetric rings stacked back-to-back. Its 14 proteolytic active sites are located within a central, roughly spherical chamber approximately 51 A in diameter. Access to the proteolytic chamber is controlled by two axial pores, each having a minimum diameter of approximately 10 A. From the structural features of ClpP, we suggest a model for its action in degrading proteins.
authors.affiliation: Biology Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: J A
authors.initials: JA
authors.lastname: Hartling
authors.forename: J M
authors.initials: JM
authors.lastname: Flanagan
mesh_terms: D000251:Adenosine Triphosphatases; D000255:Adenosine Triphosphate / Q000378:metabolism*; D000595:Amino Acid Sequence; D001665:Binding Sites; D018360:Crystallography, X-Ray; D049071:Endopeptidase Clp; D004926:Escherichia coli / Q000201:enzymology; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011487:Protein Conformation; D017510:Protein Folding; D011506:Proteins / Q000378:metabolism*; D012697:Serine Endopeptidases / Q000737:chemistry* / Q000378:metabolism; D013499:Surface Properties
chemical_list: D011506:Proteins; D000255:Adenosine Triphosphate; D012697:Serine Endopeptidases; D049071:Endopeptidase Clp; D000251:Adenosine Triphosphatases