SS1 — Solanum tuberosum

Summary

PGSC0003DMG400001328 (SS1, also known as SS2) on potato chromosome 2 encodes a starch synthase with alpha-1,4-glucan glucosyltransferase (NDP-glucose donor) activity (EC 2.4.1.21). The product localises to the amyloplast, chloroplast stroma and plastid, and is associated with amylopectin anabolism, regulation of starch metabolism, starch anabolism and breakdown, chlorophyll a breakdown and metabolism, sucrose metabolism, lipogenesis, triglyceride anabolism, endosperm development, embryogenesis, and protein processing and targeting. The gene has been linked to starch digestibility, amylose content, phosphorus and phosphate content, seed weight, sucrose and protein content, photosynthetic rate, chlorophyll content, and nematode resistance. Studies of related genes in other species connect the family to starch metabolism, starch structure, and altered starch composition with increased amylose and modified amylopectin structure.