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Default Solvent interaction of a Hsp70 chaperone substrate-binding domain investigated with w

Solvent interaction of a Hsp70 chaperone substrate-binding domain investigated with water-NOE NMR experiments.

Related Articles Solvent interaction of a Hsp70 chaperone substrate-binding domain investigated with water-NOE NMR experiments.

Biochemistry. 2003 Sep 30;42(38):11100-8

Authors: Cai S, Stevens SY, Budor AP, Zuiderweg ER

The interaction of solvent of the substrate binding domain of the bacterial heat shock 70 chaperone protein DnaK was studied in its apo form and with bound hydrophobic substrate peptide, using refined nuclear magnetic resonance experiments. Distinct differences between the two states of the protein were observed. According to our data, the apo form interacts more extensively with solvent than the peptide-bound form. Significantly, the open hydrophobic substrate binding cleft of DnaK in the apo form is found to contain several molecules of water which are displaced by the binding of the hydrophobic substrate, the peptide NRLLLTG. The solvent in the hydrophobic cleft has a residence time longer than 400 ps. It is predicted that the displacement of this trapped water must contribute to the binding free energy of the natural hydrophobic substrates of this class of protein-folding chaperone proteins.

PMID: 14503860 [PubMed - indexed for MEDLINE]



Source: PubMed
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