Abstract
Here, we have analyzed the enzyme ornithine carbamoyltransferase (OCTase) in different classes of microorganisms belonging to psychrophiles, mesophiles and thermophiles. This OCTase catalyzes the formation of citrulline from carbamoyl phosphate (CP) and ornithine (ORN) in arginine biosynthesis pathway and has certain unique adaptations to regulate metabolic pathways in extreme conditions. The tertiary structure of OCTase showed two binding domains, the CP domain and ORN-binding domain at N and C terminals, respectively. We propose general acid–base catalysis in Pseudomonas gessardii between His259 and Asp220 in which later may act as a recipient of proton in the process. The comparative docking analysis showed that substrate-binding loops have been evolved to accommodate their lifestyles across the physiological temperature range where two substrates bind on two distinct loops in psychrophiles and mesophiles, whereas both the substrates bind on a single-substrate-binding loop in thermophiles and bring down the flexibility of the active site pocket to improve its evolutionary fitness.
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Acknowledgements
This work was supported by the Science and Engineering Research Board-Department of Science and Technology, Govt. of India (PDF/2016/000818). YA lab is supported by Govt. of India extramural research funds from Department of Biotechnology and Indian Council of Medical Research (Ministry of Health & Family welfare, Govt. of India). Authors are thankful to the anonymous reviewers and the handling editor for their input on the initial version of the manuscript, it has hugely improved our work.
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Sharma, S., Sharma, S., Ahmed, M. et al. Ornithine carbamoyltransferase from psychrophiles to thermophiles: structural evolution of catalytic fold to accommodate physiological diversity. Extremophiles 25, 15–24 (2021). https://doi.org/10.1007/s00792-020-01208-7
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DOI: https://doi.org/10.1007/s00792-020-01208-7