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expand all sections collapse all sections  Oryza sativa Gene "flo4"
ID 86264
Name flo4 (GENE SYMBOL)
Synonyms (9)
GRAMENE GENEGR:0101188
Type Gene
Species Oryza sativa (Oryza sativa) [ GR_tax:013681 ]
Germplasm
Description Pyruvate orthophosphate dikinase (PPDK; EC 2.7.9.1) catalyzes the
interconversion of pyruvate, ATP, and Pi (inorganic Phosphate) with
phosphoenolpyruvate (PEP), AMP, and PPi. This enzyme plays an important role in
the photosynthesis of C4 and crassulacean acid metabolism (CAM) plants, where it
catalyzes the conversion of pyruvate to PEP. Although PPDK is also present in C3
plants such as rice, it is not thought to participate directly in
photosynthesis. Nevertheless, the PPDK found in C3 plants is highly homologous
to the C4 enzyme with regard to its structure and biochemical characteristics.
The mutant form results in white-core opaque phenotype. The gene flo4,
cosegregates with insertional mutations in the OsPPDKB rice gene. flo4 is an
important modulator of carbon flow for starch and lipid biosynthesis during
grain filling. There are two promoters for this gene. One gives a long form of
the transcript (3.4kb) that encodes for the PPDK protein targeted to the
plastid. Another promoter found in the second intron of the larger 3.4kb
transcript region of the gene, gives a shorter form of the transcript (3.0kb)
and the translated PPDK protein is targeted to cytoplasm, because the
translational start site of the smaller 3.0kb form is present downsteram of the
plastid targeting peptide found in the long form. The plastid form is expressed
in the leaf blade and sheath, wheras the cytosolic form was detected in root,
leaf blade, leaf sheath and developing grains and was not expressed in carpels.
The cytosolic form was induced after pollination and gradually increased during
fruit (grain) development.
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