バイオミメティックセレニナートおよびセレニノナート
1Department of Chemistry & Chemical Biology, Rutgers-The State University of New Jersey, Piscataway, New Jersey 08854, USA.
Journal of the American Chemical Society
|June 26, 2008
まとめ
研究者は,セレノエステルからセレニン酸とセレニン酸を含む新しいセレニウム化合物を合成しました. これらの化合物は,タンパク質や酵素に含まれる生物学的ヌクレオフィルとのユニークな反応性を示しています.
科学分野:
- 有機化学 オーガニック・ケミストリー
- バイオ・オーガニック化学 バイオ・オーガニック化学
- 薬用化学 薬用化学について
背景:
- セレニウム化合物は,生物系において重要な役割を果たします.
- セレニウム種の反応性を理解することは,薬物開発と生化学にとって不可欠です.
- セレノエステルは,セレニウムを含む様々な分子の前駆体である.
研究 の 目的:
- 様々なピラノース,ヌクレオシド,アミノ酸,ポリ水素ベースのセレニン酸およびセレニン酸を合成する.
- これらのセレニウム酸の結合反応を生物学的核性群と研究する.
主な方法:
- DMDO (メタクロロペロキシベンゾ酸) を使用したセレノエステルの酸化.
- 合成されたセレニウム化合物と生物学的ヌクレオフィル (例えば,スルフヒドリル,インドール,フェノール,イミダゾール,カルボキシアミド) の間の結合反応の探索.
主要な成果:
- 様々なセレニン酸とセレニン酸の合成に成功しました.
- セレニウム機能とアミノ酸由来核愛子の間の異常な結合反応の実証.
- タンパク質および酵素活性部位内の潜在的な相互作用の特定.
結論:
- この研究は,セレニウムを含む重要な酸への新しい合成経路を提供します.
- 観察された結合反応は,生物学的システムにおけるセレニウムの役割についての洞察を提供します.
- これらの発見は,セレニウムベースの治療薬と生化学プローブの設計に影響を与える可能性があります.
関連する概念動画
Preparation and Reactions of Sulfides
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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...
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...
Chirality at Nitrogen, Phosphorus, and Sulfur
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Stereoisomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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...
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...


