Protein
4-alpha-glucanotransferase DPE2
Organism
Arabidopsis thaliana
Function
Cytosolic alpha-glucanotransferase essential for the cytosolic metabolism of maltose, an intermediate on the pathway by which starch is converted to sucrose in leaves at night. Metabolizes maltose exported from the chloroplast and is specific for beta-maltose. May play a role in freezing tolerance. Temperature drop induces inactivation of DPE2 that leads to rapid accumulation of maltose, a solute that protects cells from freezing damage.
Similarity
Belongs to the disproportionating enzyme family.
Sequence
MMNLGSLSLSTSKSSKPMVSISFWIPYFTHWGESLLVCGSAPGLGSGNVKKGLLLKPSQQDDQLIWSGSVSVPPGFSSDYCYYVVDDSKSVLRSEFGMKRKLVVPETLTGGESVHLRDLWQSGDQALPFRSAFKDVIFHHSFDVKVEKPLGVFMNKSDQDDSVVVQFKICCPDIGEGTSVYVLGTPEKLGNWKVENGLRLNYVDDSIWEADCLIPKADFPIKYRYCKVQKEDSIGFESGGNRELSLHSIGSKQEYIVMSDGLFRAMPWRGAGVAVPMFSVRSEDDVGVGEFLDLKLLVDWAVDSGLHLVQLLPVNDTSVHKMWWDSYPYSSLSVFALHPLYLRVQALSERLPEDIKEEIQKAKNQLDKNDVDYEATMETKLSIAKKIFDIEKDQTLNSSTFQKFFSENEGWLKPYAAFCFLRDFFETSDHSQWGTFSDYTDDKLEKLISKDNLHYNTICFHYYIQYHLHVQLSAAAEYARKKGVVLKGDLPIGVDRNSVDTWVYRNLFRMNTSTGAPPDYFDKNGQNWGFPTYNWEEMSKDNYAWWRARLTQMGKYFTAYRIDHILGFFRIWELPAHAMTGLVGKFRPSIPLSQEELEKEGIWDFDRLSKPYIQKKFLEEKFGDFWPFIASNFLNETQKDMYEFKEDCNTEKKIVAKLKSLAEKSLLLENEDKVRRDVFDILRNVVLIKDPEDARKFYPRFNIEDTSSFQDLDDHSKNVLKRLYYDYYFQRQEDLWRKNALKTLPALLNSSNMLACGEDLGLIPSCVHPVMQELGLVGLRIQRMPSESDVKFGIPSNYDYMTVCAPSCHDCSTLRAWWEEDEERRQQYFKEVIGVDGIPPSQCIPEITHFILRQHVEAPSMWAIFPLQDMMALKEEYTTRPATEETINDPTNPKHYWRYRVHVTLDSLLKDTDLKSTIKNLVSSSGRSVPANVSGEDINKSRGEVIANGSTKPNP