Reduction of human defensin 5 affords a high-affinity zinc-chelating peptide.

Reduction of human defensin 5 affords a high-affinity zinc-chelating peptide.
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减少人防御素5提供了高亲和力的锌螯合肽。

DOI:
10.1021/cb400340k
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发表时间:
2013-09-20
影响因子:
4
通讯作者:
Nolan, Elizabeth M.
Nolan, Elizabeth M.
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang, Yunfei;Cougnon, Fabien B. L.;Wanniarachchi, Yoshitha A.;Hayden, Joshua A.;Nolan, Elizabeth M.

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人类防御素5 (HD5)是一种富含32个残基半胱氨酸的宿主防御肽,在氧化形式下具有三个二硫键(HD5ox)。它大量存在于小肠Paneth细胞中,这些细胞将HD5释放到肠腔中,并容纳功能未知的不稳定Zn(II)储存。在这里,我们考虑了HD5的氧化还原性质,并报道了还原形式HD5red是一种金属离子螯合剂。在pH 7.0时,HD5的中点电位为- 257 mV。HD5red利用其半胱氨酸残基来协调锌(II)的一个当量,其表观Kd1值在中皮摩尔范围内。Zn(II)或Cd(II)的结合干扰了HD5red到HD5ox的氧化折叠途径。虽然HD5red对蛋白水解降解非常敏感,但锌(II)结合形式对胰蛋白酶和其他蛋白酶的水解分解具有抗性。还原防御蛋白肽协调Zn(II)的能力为这些肽如何在体内持续存在提供了一个假定的机制。
Human defensin 5 (HD5) is a 32-residue cysteine-rich host-defense peptide that exhibits three disulfide bonds in the oxidized form (HD5ox). It is abundant in small intestinal Paneth cells, which release HD5 into the intestinal lumen and house a labile Zn(II) store of unknown function. Here we consider the redox properties of HD5 and report that the reduced form, HD5red, is a metal-ion chelator. HD5 has a midpoint potential of −257 mV at pH 7.0. HD5red utilizes its cysteine residues to coordinate one equivalent of Zn(II) with an apparent Kd1 value in the mid-picomolar range. Zn(II) or Cd(II) binding perturbs the oxidative folding pathway of HD5red to HD5ox. Whereas HD5red is highly susceptible to proteolytic degradation, the Zn(II)-bound form displays resistance to hydrolytic breakdown by trypsin and other proteases. The ability of a reduced defensin peptide to coordinate Zn(II) provides a putative mechanism for how these peptides persist in vivo.
DOI: 10.1021/bi201043j
发表时间: 2011-09-20
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Wanniarachchi, Yoshitha A.;Kaczmarek, Piotr;Wan, Andrea;Nolan, Elizabeth M.
通讯作者: Nolan, Elizabeth M.
DOI: 10.1074/jbc.m801851200
发表时间: 2008-08-01
影响因子: 4.8
作者:
Rajabi, Mohsen;de Leeuw, Erik;Lu, Wuyuan
通讯作者: Lu, Wuyuan
DOI: 10.1021/bi00476a001
发表时间: 1990-06-19
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
VALLEE, BL;AULD, DS
通讯作者: AULD, DS
DOI: 10.1038/nature09674
发表时间: 2011-01-20
期刊: NATURE
影响因子: 64.8
作者:
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通讯作者: Wehkamp, Jan
DOI: 10.4161/gmic.2.4.17692
发表时间: 2011-01-01
期刊: GUT MICROBES
影响因子: 12.2
作者:
Schroeder, Bjoern O.;Stange, Eduard F.;Wehkamp, Jan
通讯作者: Wehkamp, Jan