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カルシウムイオングラディエントは,ヒトカルプロテクトニンの亜鉛親和性と抗菌活性を調節する
Megan Brunjes Brophy1, Joshua A Hayden, Elizabeth M Nolan
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Journal of the American Chemical Society
|October 23, 2012
まとめ
カルプロテクチン (CP) は,亜鉛と結合する抗菌タンパク質です. その亜鉛結合親和性は,カルシウムによって強化され,細胞外環境で細菌の成長を抑制することができます.
科学分野:
- バイオケミストリー バイオケミストリー
- メタロプロテインです.
- 抗微生物のメカニズムは,
背景:
- カルプロテクチン (Calprotectin, CP) は,中性粒子が由来する抗菌タンパク質である.
- CPは,微生物の成長を抑制するために,必要不可欠な金属栄養素を隔離します.
- CPの金属結合特性を理解することは,その抗菌機能にとって極めて重要です.
研究 の 目的:
- カルプロテクチンの亜鉛結合特性を定義するために.
- CP.内の特定の金属結合部位を特定する.
- CPの亜鉛結合と抗微生物活性におけるカルシウムの役割を明らかにする.
主な方法:
- Co(II) をプローブ (光学吸収,EPR) として使用したスペクトロスコピー研究.
- 亜鉛の競争定位による熱力学的金属結合試験.
- インビトロ抗菌活性アッセイ.
主要な成果:
- CP.におけるHis(3) AspとHis(4) の亜鉛結合部位に特異なスペクトロスコピカルシグネチャを特定した.
- 2:1 Zn(II):CP ステキオメトリーを決定し,両方の部位が Zn(II) を調整した.
- CPの亜鉛親和性はカルシウムに依存しており,Ca (II) の存在で著しく増加することが示されました.
結論:
- カルプロテクチンは,特定のヒス素に富んだ部位を利用して亜鉛と結合し,カルシウムによって調節される親和性を有する.
- 生理学的カルシウムグラデーションは,CPの強力な細胞外亜鉛ケレーションを調節する可能性がある.
- CPは,グラム陰性細菌とグラム陽性細菌の両方を効果的に抑制するために,金属結合部位とカルシウムを必要とします.
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