Table 2.
Proportion of major secondary structural components of different plant proteins
| Protein | α-Helices (%) | β-Sheets (%) | β-Turns/turns (%) | Random coil (%) | β-Strands (%) | Antiparallel β-sheet (%) | Disordered structures (%) | Source |
|---|---|---|---|---|---|---|---|---|
| Rice globulins | About 30% | Over 50%b | About 20 | – | – | Ellepola et al. (2005) | ||
| Oat protein isolate | 19 | 74 | 7 | – | – | – | – | Liu et al. (2009) |
| Barleyd | 28.0 | 31.0 | 6.6 + 2.4 | – | – | 7.4 | – | Carbonaro et al. (2012) |
| Soybeand | 11.8 | 30.2 | 12.8 + 15.4 | – | – | 7.1 | – | Carbonaro et al. (2012) |
| Soy protein isolate | 29.6 | 36.8 | 16.0 | – | – | – | 18.5 | Withana-Gamage et al. (2011) |
| Soybean 7S globulns | 14.5 | 45.6 | 23.8 | – | – | – | 14.4 | Zhao et al. (2008) |
| Soybean 11S globulins | 17.0 | 47.3 | 19.3 | – | – | – | 16.5 | Zhao et al. (2008) |
| Chickpea protein isolates | 25.6–32.7 | 32.5–40.4 | 13.8–18.9 | – | – | – | 16.3–19.2 | Withana-Gamage et al. (2011) |
| Chickpead | 19.9 | 37.2 | 7.7 + 11.7 | – | – | 7.2 | – | Carbonaro et al. (2012) |
| Pea protein isolate | 28.0 | 30.0 | 21.7 | – | – | 6.9 | – | Shevkani et al. (2015b) |
| Kidney bean protein isolate | 22.8 | 38.6 | 20.1 | – | – | 8.4 | – | Shevkani et al. (2015b) |
| Dolichos lablab vicilins | 13.8 | 16.7 | 18.2 | 13.0 | 18.8 | – | – | Law et al. (2008) |
| Phaseolus calcaratus vicilins | 13.5 | 20.9 | 18.6 | 14.0 | 11.9 | – | – | Law et al. (2008) |
| Red bean (Phaseolus angularis) globulinsa | 23.2 | 17.9 | 30.0 | 28.9 | – | – | – | Meng and Ma (2002) |
| Lentilsd | 18.0 | 33.0 | 5.4 + 13.4 | – | – | 6.2 | – | Carbonaro et al. (2012) |
aCalculated from far-UV CD spectra
bβ-Sheets and turns
cMean values for 5 lines/genotypes
dReported as spectral weights of the secondary structure components