UniProt:Q0JGK4 SPS1

chain
  • chain:1-1084
checksum A42BA599C4DF4556
comment
  • FUNCTION Plays a role in photosynthetic sucrose synthesis by catalyzing the rate-limiting step of sucrose biosynthesis from UDP-glucose and fructose- 6-phosphate. Involved in the regulation of carbon partitioning in the leaves of plants. May regulate the synthesis of sucrose and therefore play a major role as a limiting factor in the export of photoassimilates out of the leaf. Plays a role for sucrose availability that is essential for plant growth and fiber elongation (By similarity).CATALYTIC ACTIVITY beta-D-fructose 6-phosphate + UDP-alpha-D-glucose = sucrose 6(F)-phosphate + UDP + H(+)ACTIVITY REGULATION Activity is regulated by phosphorylation and moderated by concentration of metabolites and light.PATHWAY Glycan biosynthesis; sucrose biosynthesis; sucrose from D-fructose 6-phosphate and UDP-alpha-D-glucose: step 1/2.SUBUNIT Homodimer or homotetramer.TISSUE SPECIFICITY Expressed in germinating seeds.DEVELOPMENTAL STAGE Highly expressed in source leaves and at low levels in sink leaves.INDUCTION Circadian-regulated, with the highest expression 1 hour before the beginning of light period (in 14 hours light/10 hours dark cycle).SIMILARITY Belongs to the glycosyltransferase 1 family.
created [InstanceEdit:1164949] Wu, Guanming, 2010-12-11
crossReference
databaseName UniProt
dbId 1157917
description
  • recommendedName: Probable sucrose-phosphate synthase 1 ecNumber: 2.4.1.14 alternativeName: Sucrose phosphate synthase 1F shortName: OsSPS1F alternativeName: UDP-glucose-fructose-phosphate glucosyltransferase
displayName UniProt:Q0JGK4 SPS1
geneName
  • SPS1
  • Os01g0919400
  • LOC_Os01g69030
  • P0678F11.16
identifier Q0JGK4
isSequenceChanged false
keyword
  • Glycosyltransferase
  • Reference proteome
  • Transferase
modified [InstanceEdit:9939033] Weiser, Joel, 2025-02-21
name
  • SPS1
referenceDatabase [ReferenceDatabase:2] UniProt
schemaClass ReferenceGeneProduct
secondaryIdentifier
  • SPSA1_ORYSJ
  • Q43010
  • Q43802
  • Q5JLN3
  • Q94JN0
sequenceLength 1084
species [Species:1250427] Oryza sativa subsp. japonica
url http://purl.uniprot.org/uniprot/Q0JGK4