Hybrid Rubisco with Complete Replacement of Rice Rubisco Small Subunits by Sorghum Counterparts Confers C 4 Plant-like High Catalytic Activity

Mol Plant. 2020 Nov 2;13(11):1570-1581. doi: 10.1016/j.molp.2020.08.012. Epub 2020 Aug 31.


Photosynthetic rate at the present atmospheric condition is limited by the CO2-fixing enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) because of its extremely low catalytic rate (kcat) and poor affinity for CO2 (Kc) and specificity for CO2 (Sc/o). Rubisco in C4 plants generally shows higher kcat than that in C3 plants. Rubisco consists of eight large subunits and eight small subunits (RbcS). Previously, the chimeric incorporation of sorghum C4-type RbcS significantly increased the kcat of Rubisco in a C3 plant, rice. In this study, we knocked out rice RbcS multigene family using the CRISPR-Cas9 technology and completely replaced rice RbcS with sorghum RbcS in rice Rubisco. Obtained hybrid Rubisco showed almost C4 plant-like catalytic properties, i.e., higher kcat, higher Kc, and lower Sc/o. Transgenic lines expressing the hybrid Rubisco accumulated reduced levels of Rubisco, whereas they showed slightly but significantly higher photosynthetic capacity and similar biomass production under high CO2 condition compared with wild-type rice. High-resolution crystal structural analysis of the wild-type Rubisco and hybrid Rubisco revealed the structural differences around the central pore of Rubisco and the βC-βD hairpin in RbcS. We propose that such differences, particularly in the βC-βD hairpin, may impact the flexibility of Rubisco catalytic site and change its catalytic properties.

Keywords: C4 plant; CRISPR-Cas9; Rubisco; photosynthesis; rice.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • CRISPR-Cas Systems
  • Carbon Dioxide / metabolism
  • Catalysis
  • Gene Knockout Techniques
  • Oryza / enzymology*
  • Oryza / genetics
  • Photosynthesis
  • Plants, Genetically Modified
  • Protein Subunits / metabolism
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Ribulose-Bisphosphate Carboxylase / genetics
  • Ribulose-Bisphosphate Carboxylase / metabolism*
  • Sorghum / enzymology*
  • Sorghum / genetics
  • Sulfuric Acid Esters / metabolism


  • Protein Subunits
  • Recombinant Fusion Proteins
  • Sulfuric Acid Esters
  • Carbon Dioxide
  • Ribulose-Bisphosphate Carboxylase