This entry represents the fucose pyrophosphorylase domain found at the N-terminal of the bifunctional L-Fucokinase/GDP-Fucose Pyrophosphorylase (FKP) enzymes such as FKGP from Arabidopsis and L-fucose kinase from animals [2,3]. In fucose-1-phosphate ...
This entry represents the fucose pyrophosphorylase domain found at the N-terminal of the bifunctional L-Fucokinase/GDP-Fucose Pyrophosphorylase (FKP) enzymes such as FKGP from Arabidopsis and L-fucose kinase from animals [2,3]. In fucose-1-phosphate guanylyltransferase from human, this is the main domain of the protein, which catalyses the formation of GDP-L-fucose from GTP and L-fucose-1-phosphate and functions as a salvage pathway to reutilise L-fucose arising from the turnover of glycoproteins and glycolipids [4,5]. In the salvage pathway of GDP-L-fucose, free cytosolic fucose is phosphorylated by fucokinase to form L-fucose-L-phosphate, which is then further converted to GDP-L-fucose in the reaction catalysed by GDP-L-fucose pyrophosphorylase [1-5]. The structure of this domain has been determined [5]; it consists of a typical Rossmann fold and a left-handed beta-helix fold inserted on it. This domain contains a loop region that is critical to the GDP-fucose pyrophosphorylase activity of FKP and may be the putative GTP binding site during catalysis (which contains the HXGGXSXRXP(X)5GK motif) [5].
This entry represents a conserved domain with a Gly/Ser-rich region found in galacto-, homoserine, mevalonate and phosphomevalonate kinases (GHMP) which is involved in the binding of ATP [1,2].
