Corbicula spp.有色围岩中铁-儿茶酚复合物的形成机制

IF 2.9 3区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Metallomics Pub Date : 2024-12-02 DOI:10.1093/mtomcs/mfae055
Kuniko Takemoto, Masataka Murakami, Yoshihiro Ueno, Daiya Bamba, Hirona Yamagishi
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引用次数: 0

摘要

蚬壳分布于全球各地,根据沉积物的环境条件,其外壳颜色大致分为淡黄色和黑色。铁-L-3,4-二羟基苯丙氨酸(DOPA)复合物在钙质层上的薄有机层(称为围岩)中形成,导致蛤壳变黑。然而,铁-DOPA 复合物的形成机制尚不清楚。为了揭示铁是如何从水生环境迁移到蚬壳的,研究人员使用电子探针显微分析仪(EPMA)和拉曼光谱对蚬壳进行了横截面分析,以研究铁在蚬壳中的分布和结构。除沉积物外,铁只存在于外壳中,而且所有的铁都以铁-DOPA 复合物的形式存在。衰减全反射红外光谱和氧 K 边 X 射线吸收精细结构光谱显示,原生围岩的分子结构与外壳颜色无关。这些结果表明,溶解的铁-有机络合物从水环境扩散到围岩,通过配体交换形成铁-DOPA络合物。由于铁-DOPA 复合物的颜色取决于 pH 值,因此贝壳的颜色可以作为贝壳生长环境的历史指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Formation mechanism of iron-catechol complexes in the colored periostracum of Corbicula spp.

The shell color of Corbicula clams, which are globally distributed, is roughly divided into yellowish and blackish depending on the environmental conditions of the sediment. The formation of an iron-L-3,4-dihydroxyphenylalanine (DOPA) complex in a thin organic layer, called the periostracum, on a calcareous layer causes the blackening of the clamshell. However, the iron-DOPA complex formation mechanism is unclear. To reveal how the iron is transported from the aquatic environment to the periostracum, cross-sectional analyses of the shell were conducted using an electron probe microanalyzer and Raman spectroscopy to investigate the distribution and structure of iron in the shell. Iron was only present in the periostracum, excluding deposition, and all iron was in the form of an iron-DOPA complex. Attenuated total reflection infrared spectroscopy and oxygen K-edge X-ray absorption fine structure spectroscopy revealed that the molecular structure of the native periostracum is independent of shell color. These results indicate that dissolved iron-organic complexes diffuse from the aqueous environment to the periostracum, forming iron-DOPA complex through ligand exchange. Because the iron-DOPA complex color depends on the pH, the shell color can serve as a historical indicator of the shell's growth environment.

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来源期刊
Metallomics
Metallomics 生物-生化与分子生物学
CiteScore
7.00
自引率
5.90%
发文量
87
审稿时长
1 months
期刊介绍: Global approaches to metals in the biosciences
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