Literature summary for 2.4.1.14 extracted from

Lin, I.W.; Sosso, D.; Chen, L.Q.; Gase, K.; Kim, S.G.; Kessler, D.; Klinkenberg, P.M.; Gorder, M.K.; Hou, B.H.; Qu, X.Q.; Carter, C.J.; Baldwin, I.T.; Frommer, W.B.
Nectar secretion requires sucrose phosphate synthases and the sugar transporter SWEET9 (2014), Nature, 508, 546-549.

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Natural Substrates/ Products (Substrates)

Natural Substrates	Organism	Comment (Nat. Sub.)	Natural Products	Comment (Nat. Pro.)	Rev.	Reac.
UDP-glucose + D-fructose 6-phosphate	Arabidopsis thaliana	-	UDP + sucrose 6F-phosphate	-	r
UDP-glucose + D-fructose 6-phosphate	Nicotiana attenuata	-	UDP + sucrose 6F-phosphate	-	r
UDP-glucose + D-fructose 6-phosphate	Brassica rapa subsp. pekinensis	-	UDP + sucrose 6F-phosphate	-	r

Organism

Organism	UniProt	Comment	Textmining
Arabidopsis thaliana	-	gene sps2	-
Arabidopsis thaliana	Q94BT0	gene SPS1; gene SPS1	-
Brassica rapa subsp. pekinensis	Q84XS4	-	-
Nicotiana attenuata	-	-	-

Source Tissue

Source Tissue	Comment	Organism	Textmining
extrastaminal nectary	-	Brassica rapa subsp. pekinensis	-
flower	-	Arabidopsis thaliana	-
flower	-	Nicotiana attenuata	-
flower	-	Brassica rapa subsp. pekinensis	-
gynoecial nectary	-	Nicotiana attenuata	-
nectary	high expression level of genes SPS1F and SPS2F in maturing nectaries	Arabidopsis thaliana	-
nectary parenchyma	-	Arabidopsis thaliana	-
nectary parenchyma	-	Nicotiana attenuata	-
nectary parenchyma	-	Brassica rapa subsp. pekinensis	-

Substrates and Products (Substrate)

Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
UDP-glucose + D-fructose 6-phosphate	-	Arabidopsis thaliana	UDP + sucrose 6F-phosphate	-	r
UDP-glucose + D-fructose 6-phosphate	-	Nicotiana attenuata	UDP + sucrose 6F-phosphate	-	r
UDP-glucose + D-fructose 6-phosphate	-	Brassica rapa subsp. pekinensis	UDP + sucrose 6F-phosphate	-	r

Synonyms

Synonyms	Comment	Organism
SPS	-	Arabidopsis thaliana
SPS	-	Nicotiana attenuata
SPS	-	Brassica rapa subsp. pekinensis

General Information

General Information	Comment	Organism
malfunction	mutation of AtSWEET9 or nectary-expressed sucrose phosphate synthase genes leads to the loss of nectar secretion	Arabidopsis thaliana
malfunction	mutation of AtSWEET9 or nectary-expressed sucrose phosphate synthase genes leads to the loss of nectar secretion	Nicotiana attenuata
malfunction	mutation of AtSWEET9 or nectary-expressed sucrose phosphate synthase genes leads to the loss of nectar secretion	Brassica rapa subsp. pekinensis
metabolism	sucrose phosphate synthase is a key enzyme for sucrose biosynthesis	Arabidopsis thaliana
metabolism	sucrose phosphate synthase is a key enzyme for sucrose biosynthesis	Nicotiana attenuata
metabolism	sucrose phosphate synthase is a key enzyme for sucrose biosynthesis	Brassica rapa subsp. pekinensis
physiological function	the enzyme is highly expressed in nectaries and that their expression is also essential for nectar secretion. Sucrose is synthesized in the nectary parenchyma by the enzyme and subsequently secreted into the extracellular space via SWEET9,a nectary-specific sugar transporter.In the the extracellular, sucrose is hydrolysed by an apoplasmic invertase to produce a mixture of sucrose, glucose and fructose. SWEET9 is essential for nectar production and can function as an efflux transporter	Arabidopsis thaliana
physiological function	the enzyme is highly expressed in nectaries, the expression is essential for nectar secretion. Sucrose is synthesized in the nectary parenchyma by the enzyme and subsequently secreted into the extracellular space via SWEET9, a nectary-specific sugar transporter. In the extracellular, sucrose is hydrolysed by an apoplasmic invertase to produce a mixture of sucrose, glucose and fructose. SWEET9 is essential for nectar production and can function as an efflux transporter	Arabidopsis thaliana
physiological function	the enzyme is highly expressed in nectaries, the expression is essential for nectar secretion. Sucrose is synthesized in the nectary parenchyma by the enzyme and subsequently secreted into the extracellular space via SWEET9, a nectary-specific sugar transporter. In the extracellular, sucrose is hydrolysed by an apoplasmic invertase to produce a mixture of sucrose, glucose and fructose. SWEET9 is essential for nectar production and can function as an efflux transporter	Nicotiana attenuata
physiological function	the enzyme is highly expressed in nectaries, the expression is essential for nectar secretion. Sucrose is synthesized in the nectary parenchyma by the enzyme and subsequently secreted into the extracellular space via SWEET9, a nectary-specific sugar transporter. In the extracellular, sucrose is hydrolysed by an apoplasmic invertase to produce a mixture of sucrose, glucose and fructose. SWEET9 is essential for nectar production and can function as an efflux transporter	Brassica rapa subsp. pekinensis

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Release 2023.1 (January 2023)