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Literature summary for 3.13.1.1 extracted from

  • Brychkova, G.; Grishkevich, V.; Fluhr, R.; Sagi, M.
    An essential role for tomato sulfite oxidase and enzymes of the sulfite network in maintaining leaf sulfite homeostasis (2013), Plant Physiol., 161, 148-164.
    View publication on PubMedView publication on EuropePMC

Cloned(Commentary)

Cloned (Comment) Organism
gene SQD1, relative enzyme expression analysis Solanum lycopersicum

Localization

Localization Comment Organism GeneOntology No. Textmining
chloroplast
-
Solanum lycopersicum 9507
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Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
UDP-alpha-D-sulfoquinovopyranose + H2O Solanum lycopersicum the enzyme catalyzes the reverse reaction UDP-alpha-D-glucose + sulfite
-
?

Organism

Organism UniProt Comment Textmining
Solanum lycopersicum C0LIR3 gene SQD1
-

Source Tissue

Source Tissue Comment Organism Textmining
leaf
-
Solanum lycopersicum
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
UDP-alpha-D-sulfoquinovopyranose + H2O the enzyme catalyzes the reverse reaction Solanum lycopersicum UDP-alpha-D-glucose + sulfite
-
?

Synonyms

Synonyms Comment Organism
SQD1
-
Solanum lycopersicum

Expression

Organism Comment Expression
Solanum lycopersicum the UDP-sulfoquinovose synthase in Solanum lycopersicum wild-type leaves is are downregulated during extended darkness, the expression of chloroplast-localized SQD1 transcript decreases during dark stress and recovers upon return to light in both wild-type and SO Ri plant. SQD1 transcript and protein levels are significantly up-regulated in response to sulfite injection into leaves of dark-stressed wild-type plants or into wild-type and SO Ri mutant leaves grown under a natural light regimes down
Solanum lycopersicum SQD1 transcript and protein levels are significantly up-regulated in response to sulfite injection into leaves of dark-stressed wild-type plants or into wild-type and SO Ri mutant leaves grown under a natural light regimes up

General Information

General Information Comment Organism
metabolism key elements of the sulfite network enzymes that include adenosine-5'-phosphosulfate reductase and the sulfite scavengers sulfite oxidase (SO), sulfite reductase, UDP-sulfoquinovose synthase, and beta-mercaptopyruvate sulfurtransferases. During extended dark, sulfite oxidase is enhanced in Solanum lycopersicum wild-type leaves, while the other sulfite network components are downregulated. One pathway for sulfite utilization is its incorporation into sulfolipids, catalyzed by the chloroplast-localized UDP-sulfoquinovose synthase. In the first step, UDP-sulfoquinovase is catalyzed by SQD1, employing sulfite and UDP-Glc as substrates, while in the second step, sulfoquinovosyldiacylglycerol (SQDG) is catalyzed by SQDG synthase, employing UDP-sulfoquinovose and diacylglycerols as substrates Solanum lycopersicum
physiological function the enzyme is a member of the sulfite network, one pathway for sulfite utilization is its incorporation into sulfolipids, catalyzed by the chloroplast-localized UDP-sulfoquinovose synthase. The degradation of sulfolipids is an essential step in chloroplast degradation Solanum lycopersicum