The act of fixing inorganic carbon into the biosphere is largely facilitated by one enzyme, Rubisco. Beyond well-studied plants and cyanobacteria, many bacteria use Rubisco for chemolithoautotrophy in extreme environments […]
Posted inAnalog Studies, Arctic / Antarctic / Alpine, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Cryobiology, Enceladus, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Microbiology & Virology, Status Report, Water/Hycean Worlds & Oceanography
![Rubisco form II structural differences between T. arctica UC1 and H. marinus. A) AlphaFold-generated [51,52] structures for H. marinus (transparent white) and T. arctica UC1 RbcII (dark blue) dimers aligned with ChimeraX [53]. Active sites colored red. Arrows point to the additional exposed active site residues in UC1 compared to H. marinus. The missing residues in UC1 at amino acid positions 78–82 (Fig. 4) are colored yellow on H. marinus structure (close44 up view in B). C) UC1 form II dimer with residue differences to H. marinus that confer a semi45 conservative or non-conservative change highlighted in orange.-- biorxiv.org](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/08/Prevalence-of-the-Calvin.png?resize=1200%2C720&ssl=1)