Table 3.
An overview of various isoforms of potato SSs together with some other biosynthesis enzymes. All potato SSs enzymes catalyse the same reaction known as ADP-glucose+(1,4-alpha-D-glucosyl)(n)=ADP+(1,4-alpha-D-glucosyl)(n+1).
| Enzyme | Chromosome locationa | Isoforms | Closest Molecular Markerb | PGS number |
Genome super scaffold number |
|---|---|---|---|---|---|
| Starch synthase | 3 2 2 8 |
SSI SSII SSIII GBSSI |
cLPT−5-E3 C2_At3g01180 T0562 C2_At1g32900 |
PGSC0003DMG200018552 PGSC0003DMG200001328 PGSC0003DMG200016481 PGSC0003DMG200012111 |
126 4 99 48 |
| Branching enzyme | 4 9 |
SBEI SBEII |
T1203 cLET−7-O3 |
PGSC0003DMG200009981 PGSC0003DMG200002712 |
32 21 |
| Debranching enzyme | 8 9 6 |
ISA1 ISA2 ISA3 |
C2_At1g31410 C2_At2g48120 C2_At4g01900 |
PGSC0003DMG200020699 PGSC0003DMG200000954 PGSC0003DMG200017932 |
361 207 208 |
| Starch phosphorylase | unknown | SP_H, SP_L | PGSC0003DMG200009711 | 644 |
a
The chromosome location was deduced from the potato genome sequence consortium database (http://www.potatogenome.net/index.php/Main_Page).
b
Based on tomato genetic map.