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相关概念视频

Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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相关实验视频

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

通过新的S-甲氨酸相互作用,PcoC的抗铜蛋白协调Cu(I).

Katrina Peariso1, David L Huffman, James E Penner-Hahn

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.

Journal of the American Chemical Society
|January 9, 2003
PubMed
概括
此摘要是机器生成的。

大肠杆菌的抗铜蛋白PcoC结合铜和其他金属. 它独特的结构揭示了一个新的富含 metionin 的铜结合部位,这对于在铜压力下细菌生存至关重要.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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科学领域:

  • 生物化学 生物化学
  • 金属蛋白的化学成分
  • 微生物耐药性的机制

背景情况:

  • 大肠杆菌的抗铜蛋白PcoC在高铜压力下对细菌的生存至关重要.
  • PcoC具有独特的富含 metionin 的序列,暗示 metionin 在铜结合中的非传统作用.
  • 之前的研究表明,β-barrel折叠类似于蓝铜蛋白.

研究的目的:

  • 研究大肠杆菌PcoC蛋白质的金属结合特性和结构特征.
  • 阐明PcoC蛋白中铜的协调化学反应,特别是氨酸残留物的作用.
  • 了解PcoC的减少 (Cu(I)) 和氧化 (Cu(II)) 形式之间的结构差异.

主要方法:

  • 射线吸收光谱 (XAS) 用于分析铜位结构在两个氧化状态.
  • 对阿波蛋白的结晶学研究.
  • 金属结合试验以确定PcoC对Cu (I),Cu (II),Hg (II) 和Ag (I) 的亲和力.

主要成果:

  • PcoC既结合了Cu (I) 和Cu (II),也结合了Hg (II) 和Ag (I).
  • 在PcoC中的Cu (II) 和Cu (I) 位点之间存在显著的结构差异,与典型的蓝铜蛋白不同.
  • (II) PcoC具有四角形结构,含有歇斯蒂丁连接体,而 (I) PcoC具有由两个氨酸残留物协调的三角形位点.

结论:

  • PcoC代表了第一个具有丰富 metionin 蛋白质铜结合部位的良好特征的例子.
  • 这一发现揭示了一种新型的生物铜协调化学.
  • 在PcoC中独特的氨酸结合对于其在抗铜性作用至关重要.