当前位置： SCI文献检索 > BIOCHEMISTRY期刊下所有文献 > Biochemical and Functional Evaluation of the Intramolecular Disulfide Bonds in the Zinc-Chelating Antimicrobial Protein Human S100A7 (Psoriasin).

Biochemical and Functional Evaluation of the Intramolecular Disulfide Bonds in the Zinc-Chelating Antimicrobial Protein Human S100A7 (Psoriasin).

Abstract：

:Human S100A7 (psoriasin) is a metal-chelating protein expressed by epithelial cells. It is a 22-kDa homodimer with two EF-hand domains per subunit and two transition-metal-binding His3Asp sites at the dimer interface. Each subunit contains two cysteine residues that can exist as free thiols (S100A7red) or as an intramolecular disulfide bond (S100A7ox). Herein, we examine the disulfide bond redox behavior, the Zn(II) binding properties, and the antibacterial activity of S100A7, as well as the effect of Ca(II) ions on these properties. In agreement with prior work [Hein, K. Z., et al. (2013) Proc. Natl. Acad. Sci. U. S. A. 112, 13039-13044], we show that apo S100A7ox is a substrate for the mammalian thioredoxin system; however, negligible reduction of the disulfide bond is observed for Ca(II)- and Zn(II)-bound S100A7ox. Furthermore, metal binding depresses the midpoint potential of the disulfide bond. S100A7ox and S100A7red each coordinate 2 equiv of Zn(II) with subnanomolar affinity in the absence and presence of Ca(II) ions, and the cysteine thiolates in S100A7red do not form a third high-affinity Zn(II) site. These results refute a prior model implicating the Cys thiolates of S100A7red in high-affinity Zn(II) binding [Hein, K. Z., et al. (2013) Proc. Natl. Acad. Sci. U. S. A. 112, 13039-13044]. S100A7ox and the disulfide-null variants show comparable Zn(II)-depletion profiles; however, only S100A7ox exhibits antibacterial activity against select bacterial species. Metal substitution experiments suggest that the disulfide bonds in S100A7 may enhance metal sequestration by the His3Asp sites and thereby confer growth inhibitory properties to S100A7ox.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Cunden LS,Brophy MB,Rodriguez GE,Flaxman HA,Nolan EM

doi

10.1021/acs.biochem.7b00781

subject

Has Abstract

pub_date

2017-10-31 00:00:00

pages

5726-5738

issue

43

eissn

0006-2960

issn

1520-4995

journal_volume

56

pub_type

杂志文章

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