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          Institute: MPI für Biochemie     Collection: Membrane Biochemistry (D. Oesterhelt)     Display Documents

ID: 41641.0, MPI für Biochemie / Membrane Biochemistry (D. Oesterhelt)
Structural analysis of the adaptor protein ClpS in complex with the N-terminal domain of ClpA
Authors:Zeth, K.; Ravelli, R. B.; Paal, K.; Cusack, S.; Bukau, B.; Dougan, D. A.
Date of Publication (YYYY-MM-DD):2002-12
Title of Journal:Nature Structural Biology
Journal Abbrev.:Nat. Struct. Biol.
Issue / Number:12
Start Page:906
End Page:911
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:In Escherichia coli, protein degradation is performed by several proteolytic machines, including ClpAP. Generally, the substrate specificity of these machines is determined by chaperone components, such as ClpA. In some cases, however, the specificity is modified by adaptor proteins, such as ClpS. Here we report the 2.5 Angstrom resolution crystal structure of ClpS in complex with the N-terminal domain of ClpA. Using mutagenesis, we demonstrate that two contact residues (Glu 79 and Lys 84) are essential not only for ClpAS complex formation but also for ClpAPS-mediated substrate degradation. The corresponding residues are absent in the chaperone ClpB, providing a structural rationale for the unique specificity shown by ClpS despite the high overall similarity between ClpA and ClpB. To determine the location of ClpS within the ClpA hexamer, we modeled the N-terminal domain of ClpA onto a structurally defined, homologous AAA+ protein. From this model, we proposed a molecular mechanism to explain the ClpS-mediated switch in ClpA substrate specificity.
Comment of the Author/Creator:Date: 2002, DEC
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Biochemie/Membrane Biochemistry (D. Oesterhelt)/Structural Biology of Proteins Involved in Protein Quality Control (K. Zeth)
External Affiliations:EMPL, Outstn Grenoble, F-38042 Grenoble 9, France; Univ Freiburg, Inst Biochem, D-79104 Freiburg, Germany
Identifiers:ISI:000179409400008 [ID No:1]
ISSN:1072-8368 [ID No:2]
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