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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Published on: December 16, 2013

HSPA5 forms specific complexes with copper.

Yongchang Qian1, Bingchao Meng, Xuchu Zhang

  • 1Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843, USA. yqian@cvm.tamu.edu

Neurochemical Research
|November 20, 2012
PubMed
Summary
This summary is machine-generated.

Heat shock protein A5 (Hspa5) specifically binds copper (Cu) to maintain cellular copper balance. This study confirms Hspa5 forms a distinct complex with Cu, crucial for Cu homeostasis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Homeostasis

Background:

  • Previous research identified a direct interaction between Heat shock protein A5 (Hspa5) and copper (Cu).
  • Hspa5 plays a role in maintaining copper homeostasis in astrocytes.

Purpose of the Study:

  • To investigate if copper (Cu) forms a specific complex with Hspa5.
  • To assay the stoichiometric binding of Cu and other metals to recombinant human HSPA5 (rh-HSPA5).

Main Methods:

  • In silico analysis of metal binding to recombinant human HSPA5 (rh-HSPA5).
  • Spectrophotometric analysis of rh-HSPA5 incubated with various metal ions (Cu, Fe, Mn, Zn, Pb) and ascorbic acid.
  • Assessing the effect of EDTA and pH on the Cu-rh-HSPA5 complex.
  • Quantifying metal ion stoichiometry bound to purified rh-HSPA5.

Main Results:

  • Incubation of rh-HSPA5 with Cu produced a specific absorbance peak at 470 nm, absent with other metals (Fe, Mn, Zn, Pb).
  • This specific absorbance peak was not observed with bovine serum albumin or another histidine-tagged protein (YWHAZ-14-3-3-Zeta) when incubated with Cu.
  • The Cu-rh-HSPA5 complex was sensitive to EDTA and stabilized at pH > 6.5.
  • Stoichiometric analysis revealed rh-HSPA5 chelates 1-2 Cu ions, 13 Fe ions, 5 Zn ions, and 10 Pb ions, but not Mn ions.

Conclusions:

  • Heat shock protein A5 (Hspa5) specifically forms a complex with copper (Cu).
  • This specific interaction supports the role of Hspa5 in maintaining copper homeostasis.