クリプトコッカス・ネオフォルマンスにおけるSTRIPAKシグナル伝達ネットワークのシステムレベルのホスホプロテオミクス解析：保存性とサブユニット特異性
bioRxiv : the preprint server for biology
|January 26, 2026
まとめ
STRIPAK複合体はクリプトコッカス・ネオフォルマンスのゲノム安定性と病原性を調整する。そのサブユニットは異なる役割を持ち、MOB3の欠失は真菌の過剰病原性と宿主細胞侵入を増加させる。
科学分野:
- 菌類学; 分子生物学; 遺伝学
背景:
- ストリアチン相互作用性ホスファターゼ・キナーゼ（STRIPAK）複合体は、キナーゼ・ホスファターゼネットワークを調節する保存されたシグナル伝達ハブである。; クリプトコッカス・ネオフォルマンスのようなヒト真菌病原体におけるその特異的な機能は、よく理解されていない。
研究 の 目的:
- クリプトコッカス・ネオフォルマンスにおけるSTRIPAK複合体サブユニットの役割を調査すること。; STRIPAK変異が真菌の増殖、病原性、宿主-病原体相互作用に及ぼす影響を分析すること。
主な方法:
- STRIPAKサブユニット変異体（PPH22、FAR8、FAR9、FAR11、MOB3）の遺伝子解析。; マウス感染モデルにおける病原性研究。; システムレベルのホスホプロテオームプロファイリング。; インビトロでの血液脳関門透過およびマクロファージ生存率アッセイ。
主要な成果:
- コアSTRIPAK変異体は、増殖、ストレス適応、細胞周期、形態形成に欠陥を示し、異数性およびゲノム不安定性を引き起こした。; far11Δ変異体は病原性がなく、far9Δ変異体は宿主関連ゲノム再構築（染色体11四倍化）を伴う遅延性の致死的疾患を引き起こした。; mob3Δ変異体は、過剰病原性、透過性亢進、マクロファージ生存率増加、および小型細胞形態を示し、播種性の増加を示唆した。; ホスホプロテオーム解析により、コア変異体ではシグナル伝達、細胞周期、RNA代謝に影響を与える広範な変化が明らかになったが、mob3Δ変異体は異なるシグネチャーを持っていた。
結論:
- STRIPAKは、C. neoformansにおけるゲノム安定性、形態学的可塑性、および病原性の調整に不可欠である。; 個々のSTRIPAKサブユニットは、宿主-病原体相互作用に影響を与える異なるシグナル伝達出力を媒介する。; MOB3の欠失は、特異的な細胞およびシグナル伝達の変化を通じて、C. neoformansの過剰病原性と播種を促進する。
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