Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:2.4.1.14 (
SPS
)
813
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Sucrose is formed in the cytoplasm of leaf cells from triose phosphates exported from the chloroplast.
Flux
control is shared among key enzymes of the pathway, one of which is
sucrose-phosphate synthase
(
SPS
). Regulation of
SPS
by protein phosphorylation is important in vivo and may explain diurnal changes in
SPS
activity and carbon partitioning. The signal transduction pathway mediating the light activation of
SPS
in vivo appears to involve metabolites and novel "coarse" control of the protein phosphatase that dephosphorylates and activates
SPS
. Regulation of the phosphorylation of
SPS
may provide a general mechanism whereby sucrose formation is coordinated with the rate of photosynthesis and the rate of nitrate assimilation. There are apparent differences among species in the properties of
SPS
that may reflect different strategies for the control of carbon partitioning. The
SPS
gene has recently been cloned from maize; results of preliminary studies with transgenic tomato plants expressing high levels of maize
SPS
support the postulate that
SPS
activity can influence the partitioning of carbon between starch and sucrose.
...
PMID:Role of sucrose-phosphate synthase in sucrose metabolism in leaves. 1666 32
