3ay9 Citations

Biochemical and structural studies on the high affinity of Hsp70 for ADP.

Protein Sci 20 1367-79 (2011)
Related entries: 3atu, 3atv

Cited: 41 times
EuropePMC logo PMID: 21608060

Abstract

The molecular chaperone 70-kDa heat shock protein (Hsp70) is driven by ATP hydrolysis and ADP-ATP exchange. ADP dissociation from Hsp70 is reportedly slow in the presence of inorganic phosphate (P(i) ). In this study, we investigated the interaction of Hsp70 and its nucleotide-binding domain (NBD) with ADP in detail, by isothermal titration calorimetry measurements and found that Mg(2+) ion dramatically elevates the affinity of Hsp70 for ADP. On the other hand, P(i) increased the affinity in the presence of Mg(2+) ion, but not in its absence. Thus, P(i) enhances the effect of the Mg(2+) ion on the ADP binding. Next, we determined the crystal structures of the ADP-bound NBD with and without Mg(2+) ion. As compared with the Mg(2+) ion-free structure, the ADP- and Mg(2+) ion-bound NBD contains one Mg(2+) ion, which is coordinated with the β-phosphate group of ADP and associates with Asp10, Glu175, and Asp199, through four water molecules. The Mg(2+) ion is also coordinated with one P(i) molecule, which interacts with Lys71, Glu175, and Thr204. In fact, the mutations of Asp10 and Asp199 reduced the affinity of the NBD for ADP, in both the presence and the absence of P(i) . Therefore, the Mg(2+) ion-mediated network, including the P(i) and water molecules, increases the affinity of Hsp70 for ADP, and thus the dissociation of ADP is slow. In ADP-ATP exchange, the slow ADP dissociation might be rate-limiting. However, the nucleotide-exchange factors actually enhance ADP release by disrupting the Mg(2+) ion-mediated network.

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  1. Biochemical and structural studies on the high affinity of Hsp70 for ADP. Arakawa A, Handa N, Shirouzu M, Yokoyama S. Protein Sci 20 1367-1379 (2011)
  2. Structure of Hsp90-Hsp70-Hop-GR reveals the Hsp90 client-loading mechanism. Wang RY, Noddings CM, Kirschke E, Myasnikov AG, Johnson JL, Agard DA. Nature 601 460-464 (2022)
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  5. Mitotic phosphorylation regulates Hsp72 spindle localization by uncoupling ATP binding from substrate release. Mukherjee M, Sabir S, O'Regan L, Sampson J, Richards MW, Huguenin-Dezot N, Ault JR, Chin JW, Zhuravleva A, Fry AM, Bayliss R. Sci Signal 11 eaao2464 (2018)
  6. The crystallization additive hexatungstotellurate promotes the crystallization of the HSP70 nucleotide binding domain into two different crystal forms. Mac Sweeney A, Chambovey A, Wicki M, Müller M, Artico N, Lange R, Bijelic A, Breibeck J, Rompel A. PLoS One 13 e0199639 (2018)
  7. Physics-based modeling provides predictive understanding of selectively promiscuous substrate binding by Hsp70 chaperones. Nordquist EB, English CA, Clerico EM, Sherman W, Gierasch LM, Chen J. PLoS Comput Biol 17 e1009567 (2021)
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