title: NMR solution structure of the 21 kDa chaperone protein DnaK substrate binding domain: a preview of chaperone-protein interaction.
abstract: The solution structure of the 21 kDa substrate-binding domain of the Escherichia coli Hsp70-chaperone protein DnaK (DnaK 386-561) has been determined to a precision of 1.00 A (backbone of the beta-domain) from 1075 experimental restraints obtained from multinuclear, multidimensional NMR experiments. The domain is observed to bind to its own C-terminus and offers a preview of the interaction of this chaperone with other proteins. The bound protein region is tightly held at a single amino acid position (a leucyl residue) that is buried in a deep pocket lined with conserved hydrophobic residues. A second hydrophobic binding site was identified using paramagnetically labeled peptides. It is located in a region close to the N-terminus of the domain and may constitute the allosteric region that links substrate-binding affinity with nucleotide binding in the Hsp70 chaperones.
authors.affiliation: Biophysics Research Division, Department of Biological Chemistry, The University of Michigan, Ann Arbor 48109, USA.
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: A V
authors.initials: AV
authors.lastname: Kurochkin
authors.forename: Y
authors.initials: Y
authors.lastname: Pang
authors.forename: W
authors.initials: W
authors.lastname: Hu
authors.forename: G C
authors.initials: GC
authors.lastname: Flynn
authors.forename: E R
authors.initials: ER
authors.lastname: Zuiderweg
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D001665:Binding Sites; D003198:Computer Simulation; D003460:Crystallization; D029968:Escherichia coli Proteins; D018840:HSP70 Heat-Shock Proteins / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D008958:Models, Molecular; D018832:Molecular Chaperones / Q000737:chemistry* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D019906:Nuclear Magnetic Resonance, Biomolecular; D010446:Peptide Fragments / Q000378:metabolism; D017434:Protein Structure, Tertiary; D012996:Solutions; D013379:Substrate Specificity
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D018840:HSP70 Heat-Shock Proteins; D018832:Molecular Chaperones; D010446:Peptide Fragments; D012996:Solutions; C063842:dnaK protein, E coli