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Nuclear Export01:42

Nuclear Export

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
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ABC Transporters: Exporter01:31

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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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Phosphorylation01:02

Phosphorylation

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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ATP Synthase: Structure01:18

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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Measuring In Vitro ATPase Activity for Enzymatic Characterization
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人間のXPR1構造は,リン酸エクスポートメカニズムを明らかにする.

Rui Yan1,2, Huiwen Chen1,3, Chuanyu Liu1,4

  • 1Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.

Nature
|August 21, 2024
PubMed
まとめ

研究者はヒトのXPR1の構造を明らかにし,それがリン酸 (Pi) を輸送し,イノシトールポリフォスファート (InsPPs) によって調節されていることを明らかにしました. これは細胞のリン酸ホメオスタシスを理解するための枠組みを提供します.

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Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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科学分野:

  • 生物化学
  • 構造生物学
  • 細胞生物学

背景:

  • 非有機リン酸 (Pi) は生命にとって不可欠であり,そのホメオスタシスは極めて重要です.
  • XPR1はヒトの唯一のパイエクスポーターで 細胞のパイバランスに不可欠です
  • XPR1の機能障害は神経変性疾患と関連しており,その重要性を強調しています.

研究 の 目的:

  • XPR1媒介 Pi 流出の構造的メカニズムを解明する.
  • 細胞内イノシトールポリフォスファート (InsPPs) によるXPR1の調節を理解する.
  • XPR1ゲーティングとInsPPセンシングの構造的基盤を提供する.

主な方法:

  • ヒトXPR1の構造を決定するために,冷凍電子顕微鏡 (cryo-EM) が使用されました.
  • Pi-bound 閉ざされた状態と開いた状態,および InsP6-bound 形態の構造が得られました.

主要な成果:

  • XPR1は,SPXドメイン,コアドメイン,およびPiトランスポートドメインで構成されています.
  • 輸送領域の3つの基本的なクラスターは,Piの結合と輸送の鍵です.
  • 保存されたトリプトファン (W573) はゲートスイッチとして作用し,SPXドメインはInsP6結合を通じてPi輸送を調節する.

結論:

  • この研究は,XPR1のゲーティングと調節を詳細に説明する高解像度構造を提供します.
  • この研究は,XPR1およびその同位体によって媒介されるPiホメオスタシスのメカニズム的理解を提供します.
  • この発見は,XPR1の機能と関連疾患に関する将来の研究のための基礎を築きます.