銅 (II) -α-シヌクレイン複合体の高親和性単核部位の構造的特徴
Marco Bortolus1, Marco Bisaglia, Alfonso Zoleo
1Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo, 1, 35131 Padova, Italy.
Journal of the American Chemical Society
|December 15, 2010
まとめ
この研究では,銅 (II) がヒトのアルファ-シナヌクレイン (aS99) の切り離された形に結合する方法を明らかにし,パーキンソン病に関連する結合およびタンパク質集約に関与する重要な残基を特定しました.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 神経科学は神経科学である.
背景:
- パーキンソン病におけるヒトアルファ-シヌクレイン (aS) 集積.
- aSは金属結合タンパク質で,銅が結合を加速する.
- 銅結合の理解は,パーキンソン病の研究に不可欠です.
研究 の 目的:
- Cu(II) と断片化されたaS (aS99) の高親和結合を調査する.
- 銅の結合部位に含まれるエリューシダート残留物.
- タンパク質のオリゴメリゼーションにおける銅の役割を決定する.
主な方法:
- 電子パラマグネティック共振 (EPR) スペクトロスコピー (多周波連続波とパルスX波帯).
- エレクトロン・スピン・エコー・エンベロープ・モジュレーション (ESEEM).
- ハイパーフィーン・サブレベル・コレレーション・スペクトロスコーピー (HYSCORE).
- デイビス電子核二重共振 (デイビス-ENDOR) をパルス化した.
- MXAN分析によるX線吸収光譜 (XAS) です.
主要な成果:
- 歪んだ正方形平面幾何学を持つII型銅複合体が見つかりました.
- 決定された赤道座標: {N(Im), N(-), H(2) O, O}.
- 提案されたN末端 (Met1) は軸結合体として作用する.
- XASを使用して構造特性を検証し,銅-aS99モデルを精製しました.
結論:
- Cu (II) のaS99.9への特定の結合モードを詳細に説明しました.
- 銅媒介アルファ-シヌクレインの集積に関する構造的洞察を提供した.
- パーキンソン病の病原性理解に貢献する.
さらに関連する動画
関連する概念動画
00:49Ligand Binding and Linkage
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:49Conserved Binding Sites
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
03:45Formation 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...
02:40Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
01:58Cooperative Allosteric Transitions
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...