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アラビドプシス・タリアナのグリシンリッチRNA結合タンパク質8のin vivoターゲットをiCLIPで特定したコンペンディウム

iLIFE by iLIFE
2025年8月6日
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以下の文章を日本語のニュース記事として翻訳しました。

—

**RNA結合タンパク質がRNA処理に与える影響を解明**

RNA結合タンパク質は、スプライシング、翻訳、RNAの分解を含むRNA処理に影響を与え、RNAの運命を決定します。したがって、細胞内のRNA-タンパク質相互作用に関する洞察は、転写後レベルでの遺伝子発現を調節する調節ネットワークに関する理解を深めることができます。高等植物においては、RNA結合タンパク質の中で、in vivoの標的や結合部位が特定されているものはわずかであり、主に植物組織による技術的課題が原因です。

私たちは以前、UV光照射に依存して細胞内のRNA-タンパク質相互作用を安定化させる個別ヌクレオチド解像度のクロスリンクおよび免疫沈降法(iCLIP)をアラビドプシス植物に適応させました。ここでは、グリシンリッチRNA結合タンパク質AtGRP8のin vivo結合ランドスケープをiCLIPを用いてプロファイリングしました。ネイティブプロモーターの下で緑色蛍光タンパク質に融合したAtGRP8を発現する転換植物は、UVクロスリンク処理を受けました。RNA-タンパク質複合体は免疫沈降され、結合したRNAはRNA-seqによって特定されました。アラビドプシスに特化したバイオインフォマティクスパイプラインが標的RNAを特定し、AtGRP8の結合部位と結合モチーフを明らかにしました。これらのデータは、植物RNA結合タンパク質の結合部位のコンペンディウムを構築するのに役立ち、植物の転写後ネットワークを解明することに貢献します。

**背景と要約**

ゲノムからタンパク質への遺伝情報の流れは、植物の最適なパフォーマンスを確保するために厳密に調整されています。特に、RNAレベルでの遺伝子発現の調節は、内因性および外因性の信号を統合し、植物のトランスクリプトームをニーズに応じて調整する重要な調整手段として浮上しています。RNA結合タンパク質(RBP)は、発生中や非生物的および生物的ストレス要因に応答する際のRNA処理と機能を調整する上で重要な役割を果たします。

哺乳類細胞や非植物モデル生物において、個別ヌクレオチド解像度のクロスリンクおよび免疫沈降法(iCLIP)は、ヌクレオチド精度での結合標的および結合部位の全ゲノムコンペンディウムを提供するための金標準です。UV光は、細胞内のネイティブなRNA-タンパク質相互作用を安定化させるために適用されます。RNA-タンパク質複合体は細胞ライセートから免疫沈降され、変性ゲル上で精製されます。結合したタンパク質は消化され、RNAは分離され、逆転写を経て高スループットシーケンシング用のライブラリが生成されます。タンパク質の残骸が逆転写酵素に障害をもたらすため、シーケンシングリードはクロスリンク部位で終了し、単一ヌクレオチド解像度で結合部位が明らかになります。

植物におけるRBPの結合部位に関する知識は、植物細胞壁による技術的制限や、液胞による植物細胞の高RNase含量、光合成クロロフィルやUV保護フラボノイドを含むUV吸収色素の存在などの理由から、動物に比べて乏しいです。私たちは以前、アラビドプシスにおける初のiCLIP分析を実施しました。

—

この翻訳は、元の内容を日本語でわかりやすく伝えることを目的としています。

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