A linker protein from a red-type pyrenoid phase separates with Rubisco via oligomerizing sticker motifs.

التفاصيل البيبلوغرافية
العنوان:	A linker protein from a red-type pyrenoid phase separates with Rubisco via oligomerizing sticker motifs.
المؤلفون:	Zhen Guo Oh, Shou Leong Ang, Warren, Cheng Wei Poh, Soak-Kuan Lai, Siu Kwan Sze, Hoi-Yeung Li, Bhushan, Shashi, Wunder, Tobias, Mueller-Cajar, Oliver
المصدر:	Proceedings of the National Academy of Sciences of the United States of America; 6/20/2023, Vol. 120 Issue 25, p1-11, 52p
مصطلحات موضوعية:	PHAEODACTYLUM tricornutum, STICKERS, TANDEM repeats, PHASE separation, ELECTRON microscopy
مستخلص:	The slow kinetics and poor substrate specificity of the key photosynthetic CO2-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 Phaeodactylum tricornutum. PYCO 1 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 PYCO 1 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 PYCO 1--Rubisco network is cross-linked by PYCO 1 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. [ABSTRACT FROM AUTHOR]
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قاعدة البيانات:	Complementary Index

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