NCBI Accession #
NP_001318975.1
NCBI GenBank Nucleotide #
NM_001331926.1
NCBI Official Full Name
Pyruvate phosphate dikinase, PEP/pyruvate binding domain-containing protein
NCBI Official Symbol
SEX1
NCBI Official Synonym Symbols
GWD; GWD1; SOP; SOP1; STARCH EXCESS 1; T16B5.10; T16B5_10
NCBI Protein Information
Pyruvate phosphate dikinase, PEP/pyruvate binding domain-containing protein
NCBI Summary
Encodes an alpha-glucan, water dikinase required for starch degradation. Involved in cold-induced freezing tolerance. Mutations that eliminate the GWD protein or affect the dikinase domain of the enzyme dramatically reduce both the amount of phosphate in the amylopectin and the rate of starch degradation. Mature leaves of these mutants accumulate amounts of starch up to seven times greater than those in wild-type leaves. NMR analysis of the mutants, suggests that the gene is specifically involved in the phosphorylation of the glucosyl residues of starch at the C6 position.
UniProt Synonym Gene Names
R1; SEX1
UniProt Protein Name
Alpha-glucan water dikinase 1, chloroplastic
UniProt Synonym Protein Names
Protein starch excess 1; Protein starch-related R1
UniProt Primary Accession #
Q9SAC6
UniProt Secondary Accession #
Q93VD0; Q940Z0; Q9FPP2; Q9SGX4
UniProt Related Accession #
Q9SAC6
UniProt Comments
Mediates the incorporation of phosphate into starch-like alpha-glucan, mostly at the C-6 position of glucose units. Acts as an overall regulator of starch mobilization. Required for starch degradation, suggesting that the phosphate content of starch regulates its degradability.