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DnaK, the prokaryotic Hsp70 molecular chaperone, requires the nucleotide exchange factor and heat shock protein GrpE to release ADP. GrpE and DnaK are tightly associated molecules with an extensive protein-protein interface, and in the absence of ADP, the dissociation constant for GrpE and DnaK is in the low nanomolar range. GrpE reduces the affinity of DnaK for ADP, and the reciprocal linkage is...
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