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Title :Atmospheric CO2 captured by biogenic polyamines is transferred as a possible substrate to Rubisco for the carboxylation reaction
Authors :Yasumoto, Ko
Sakata, Tsuyoshi
Yasumoto, Jun
Yasumoto-Hirose, Mina
Sato, Shun-ichi
Mori-Yasumoto, Kanami
Jimbo, Mitsuru
Kusumi, Takenori
Watabe, Shugo
Issue Date :7-Dec-2018
Abstract :Biogenic polyamines are involved in a wide range of plant cellular processes, including cell division,morphogenesis and stress responses. However, the exact roles of biogenic polyamines are not wellunderstood. We recently reported that biogenic polyamines that have multiple amino groups can reactwith CO2 and accelerate calcium carbonate formation in seawater. The ability of biogenic polyamines tocapture atmospheric CO2 prompted us to examine their roles in photosynthesis. Here, we demonstratedthat atmospheric CO2 captured by biogenic polyamines is a candidate substrate for the carboxylationreaction of ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco), which is an enzyme involvedin the frst major step of carbon fxation during photosynthesis, and that biogenic polyamines canaccelerate the carboxylation reaction of this enzyme because of their specifc afnity for CO2. Moreover,the results of our nuclear magnetic resonance (NMR) analysis showed that putrescine, which is the mostcommon biogenic polyamine, reacts with atmospheric CO2 and promotes the formation of carbamatederivatives and bicarbonate in aqueous environments. A sufcient amount of CO2 is well known to beproduced by carbonic anhydrase from bicarbonate in vivo. The present study indicates that CO2 wouldbe also produced by the equilibrium reaction from carbonate produced by biogenic polyamines andwould be used as a substrate of Rubisco, too. Our results may suggest a new photosynthetic researchstrategy that involves CO2-concentrating mechanisms and also possibly constitutes a potential tool forreducing atmospheric CO2 levels and, consequently, global warming.
URL :https://doi.org/10.1038/s41598-018-35641-8
Type Local :雑誌掲載論文
ISSN :2045-2322
Publisher :Nature Publishing Group
URI :http://hdl.handle.net/20.500.12000/45587
Citation :Scientific Reports Vol.8 no.1
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Agriculture)

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