Specificity factor for Rubisco (Ω (Ω=VcKo/VoKc), which is the ratio of the catalytic efficiency (Vmax/Km ) for the carboxylase (Vc/Kc) and oxygenase (Vo/Ko) reactions)
| Range | bacteria 25-75: higher plants ~80: nongreen algae 100-240 unitless |
|---|---|
| Organism | Various |
| Reference | Berg IA. Ecological aspects of the distribution of different autotrophic CO2 fixation pathways. Appl Environ Microbiol. 2011 Mar77(6):1925-36. doi: 10.1128/AEM.02473-10. p.1927 right column 2nd paragraphPubMed ID21216907 |
| Primary Source | [100] Tabita, F. R. 1999. Microbial ribulose 1,5-bisphosphate carboxylase/oxygenase: a different perspective. Photosynth. Res. 60: 1-28. link |
| Comments | P.1927 right column 2nd paragraph: "The small subunits influence the catalytic efficiency and specificity of RubisCO (ref 96), and the form I enzyme usually has lower Vmax and kcat but also higher specificity to CO2, than the form II RubisCO (refs 7, 43, 53, 106). Consequently, the specificity factor Ω for form II enzymes (Ω = 10 to 15) is much lower than that for form I (Ω = 25 to 75 in bacteria, ∼80 in higher plants, and 100 to 240 in nongreen algae) (primary source)." |
| Entered by | Uri M |
| ID | 112903 |