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-Structure paper
タイトル | A linker protein from a red-type pyrenoid phase separates with Rubisco via oligomerizing sticker motifs. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 120, Issue 25, Page e2304833120, Year 2023 |
掲載日 | 2023年6月20日 |
著者 | Zhen Guo Oh / Warren Shou Leong Ang / Cheng Wei Poh / Soak-Kuan Lai / Siu Kwan Sze / Hoi-Yeung Li / Shashi Bhushan / Tobias Wunder / Oliver Mueller-Cajar / |
PubMed 要旨 | The slow kinetics and poor substrate specificity of the key photosynthetic CO-fixing enzyme Rubisco have prompted the repeated evolution of Rubisco-containing biomolecular condensates known as ...The slow kinetics and poor substrate specificity of the key photosynthetic CO-fixing enzyme Rubisco have prompted the repeated evolution of Rubisco-containing biomolecular condensates known as pyrenoids in the majority of eukaryotic microalgae. Diatoms dominate marine photosynthesis, but the interactions underlying their pyrenoids are unknown. Here, we identify and characterize the Rubisco linker protein PYCO1 from . PYCO1 is a tandem repeat protein containing prion-like domains that localizes to the pyrenoid. It undergoes homotypic liquid-liquid phase separation (LLPS) to form condensates that specifically partition diatom Rubisco. Saturation of PYCO1 condensates with Rubisco greatly reduces the mobility of droplet components. Cryo-electron microscopy and mutagenesis data revealed the sticker motifs required for homotypic and heterotypic phase separation. Our data indicate that the PYCO1-Rubisco network is cross-linked by PYCO1 stickers that oligomerize to bind to the small subunits lining the central solvent channel of the Rubisco holoenzyme. A second sticker motif binds to the large subunit. Pyrenoidal Rubisco condensates are highly diverse and tractable models of functional LLPS. |
リンク | Proc Natl Acad Sci U S A / PubMed:37311001 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.0 - 2.6 Å |
構造データ | EMDB-33887, PDB-7yk5: EMDB-35158: Rubisco from Phaeodactylum tricornutum EMDB-35159: PYCO1(452-592) from Phaeodactylum tricornutum EMDB-35166: Rubisco from Phaeodactylum tricornutum bound to PYCO1(452-592) |
化合物 | ChemComp-CAP: |
由来 |
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キーワード | PHOTOSYNTHESIS (光合成) / Rubisco (リブロース1,5-ビスリン酸カルボキシラーゼ/オキシゲナーゼ) / phase separation / rubisco linker protein / condensation (凝縮) / pyrenoid (ピレノイド) / phaeodactylum tricornutum (フェオダクチラム) |