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Title: Temperature response of Rubisco kinetics in Arabidopsis thaliana: thermal breakpoints and implications for reaction mechanisms

Journal Article · · Journal of Experimental Botany
DOI: https://doi.org/10.1093/jxb/ery355 · OSTI ID:1610565
 [1];  [2];  [3];  [4]
  1. Washington State Univ., Pullman, WA (United States); Univ. of Illinois at Urbana-Champaign, IL (United States). Carl R. Woese Institute for Genomic Biology; DOE/OSTI
  2. Univ. of New Brunswick, Fredericton NB (Canada); Univ. of Illinois at Urbana-Champaign, IL (United States). Carl R. Woese Institute for Genomic Biology
  3. Univ. of New Brunswick, Fredericton NB (Canada)
  4. Washington State Univ., Pullman, WA (United States)

Enhancement of Rubisco kinetics could improve photosynthetic efficiency, ultimately resulting in increased crop yield. However, imprecise knowledge of the reaction mechanism and the individual rate constants limits our ability to optimize the enzyme. Membrane inlet mass spectrometry (MIMS) may offer benefits over traditional methods for determining individual rate constants of the Rubisco reaction mechanism, as it can directly monitor concentration changes in CO2, O2, and their isotopologs during assays. However, a direct comparison of MIMS with the traditional radiolabel method of determining Rubisco kinetic parameters has not been made. Here, the temperature responses of Rubisco kinetic parameters from Arabidopsis thaliana were measured using radiolabel and MIMS methods. The two methods provided comparable parameters above 25 °C, but temperature responses deviated at low temperature as MIMS-derived catalytic rates of carboxylation, oxygenation, and CO2/O2 specificity showed thermal breakpoints. Here, we discuss the variability and uncertainty surrounding breakpoints in the Rubisco temperature response and the relevance of individual rate constants of the reaction mechanisms to potential breakpoints.

Research Organization:
Washington State University, Pullman, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); National Science and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0001685
OSTI ID:
1610565
Journal Information:
Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 1 Vol. 70; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Big progress for small subunits: new Rubisco mutants in Arabidopsis journal October 2020