Brl1-Brr6の多機能的な役割は,核毛孔複合体の生体生成中の核包膜融合におけるものです

Sayan Mondal^1,2, Annett Neuner¹, Azqa Ajmal Khan^3,4

¹Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), Deutsches Krebsforschungszentrum (DKFZ)-ZMBH Allianz, Universität Heidelberg, Heidelberg, 69120, Germany.

The EMBO journal

|February 16, 2026

まとめ

Brl1およびBrr6タンパク質は,酵母における核孔複合体 (NPC) アセンブリの間に核封筒 (NE) 融合を促進します. 彼らは環核空間を橋渡しし,適切なNE融合とNPC挿入を保証します.

科学分野:

細胞生物学細胞生物学
分子生物学は分子生物学である.
イースト遺伝学イースト遺伝学

背景:

Brl1 と Brr6 は,酵母核封筒 (NE) の統合膜タンパク質である.
核孔複合体 (NPC) アセンブリにおけるそれらの正確な役割は,ほとんど未定義のままである.
これらのタンパク質は一時的にNPCと結合する.

研究の目的:

イースト NPC アセンブリにおける Brl1 と Brr6 の特定の機能を明らかにする.
Brl1 と Brr6 が核包膜融合を調節するメカニズムを調査する.

主な方法:

Brl1およびBrr6変異体の分析,アンフィパティック α-ヘリックスおよび保存されたシステイン残留変異体を含む.
構造的な予測のためにAlphaFoldを利用する.
保存されたPALモチーフの役割を調査する.
PAL変異体の過剰発現に関する研究.
核膜 (NE) の変形と核融合の欠陥を評価する.

主要な成果:

Brr6は,NPCの組み立ての初期段階と最終段階の両方で機能します.
アンフィパティック α-ヘリクスを影響する突然変異は,NE変形なしにヌクレオポリン募集に影響します.
保存されたシステイン残留物の変異は,NE変形と不完全なNE融合を引き起こします.
Brl1のN端は,Nic96と相互作用し,その募集を促進する.
Brl1とBrr6の環核ドメインは,PALモチーフを通じて環核空間全体で相互作用する可能性があります.
これらのドメインの長さを変更すると,NE融合に影響し,拡張は制御不能な融合とNE分解を引き起こす.

結論:

Brl1とBrr6は,NPCの組立中にNE融合を促進するために不可欠です.
それらは,PALモチーフの相互作用を通じて,周核空間を橋渡しすることで機能します.
この相互作用は,後の核封筒融合とNPCの挿入を容易にする.

キーワード:

Brl1 Brl1 Brl1 Brl1 Brl1 Brl1 Brl1 Brl1 Brl1 Brl1 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 Brr6 核封筒融合は核融合である.核孔複合体について核孔コンプレックス・アセンブリ・コンプレックス

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