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Protein and Protein Structure02:15

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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ハプトグロービン-ヘモグロビン複合体の構造

Christian Brix Folsted Andersen1, Morten Torvund-Jensen, Marianne Jensby Nielsen

  • 1Department of Biomedicine, Aarhus University, 8000 Aarhus C, Denmark. cbfa@biokemi.au.dk

Nature
|August 28, 2012
PubMed
まとめ

ハプトグロビンは,血液溶解中に有害なフリーヘモグロビンを捕獲し,中和させます. 結晶構造は,ハプトグロービンがヘモグロビンと結合し,組織を酸化的損傷から保護し,CD163受容体経由でクリアランスを促進する方法を明らかにします.

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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
  • 免疫学 免疫学とは

背景:

  • 赤血球のヘモグロビンは酸素輸送に不可欠ですが,血液溶解中に血に放出されると組織に損傷を与える可能性があります.
  • ハプトグロービンは,自由ヘモグロビンを結合し,保護複合体を形成する急性相タンパク質です.
  • マラリアやヘモグロビノパシーに見られる血管内溶解は,ヘモグロビン-ハプトグロビン相互作用を理解する必要があります.

研究 の 目的:

  • 豚の二次元ハプトグロービン-ヘモグロビン複合体の結晶構造を決定する.
  • ヘモグロビン誘発の損傷に対するハプトグロービンの保護的役割の分子メカニズムを解明する.
  • ハプトグロービン-ヘモグロビン複合体とスキャベンジャー受容体CD163.3の相互作用を調査する.

主な方法:

  • 複合体の構造を決定するために2.9 Åの解像度のX線結晶学.
  • 小角X線散射 (SAXS) により,CD163.3との相互作用を研究した.
  • タンパク質-タンパク質のインターフェースと残留物のアクセシビリティの分析.

主要な成果:

  • 結晶構造は,ハプトグロービン二分化におけるベータ鎖の交換による新しい融合CCPドメイン構造を明らかにしています.
  • ハプトグロビンは,ヘモグロビンのアルファおよびベータサブユニットの両方と広範に相互作用し,緊密な結合を説明します.
  • 酸化的ダメージに敏感な重要なヘモグロビン残基は,ハプトグロービン-ヘモグロビン界面内でシールドされています.
  • 特定のハプトグロービンループはCD163受容体への結合を促進し,二重複合体は潜在的に2つの受容体を結合します.

結論:

  • この構造は,ハプトグロービンによるヘモグロビン中和の原子レベルの洞察を提供し,その保護機能を強調しています.
  • ハプトグロービンのメカニズムは,反応性ヘモグロビン部位を直接遮断し,受容体媒介クリアランスを促進することを含む.
  • この発見は,CD163に対するマルチメリックハプトグロービン-ヘモグロビンの強化された親和性を説明し,ヘム毒性の除去に不可欠である.