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Literature summary extracted from
- An essential role for tomato sulfite oxidase and enzymes of the sulfite network in maintaining leaf sulfite homeostasis (2013), Plant Physiol., 161, 148-164.
Activating Compound
| EC Number | Activating Compound | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.8.3.1 | additional information | during extended dark, sulfite oxidase activity is enhanced in tomato wild-type leaves, while the other sulfite network components are down-regulated. Exogenous sulfite application induces up-regulation of the sulfite scavenger activities in dark-stressed or unstressed wild-type plants, while expression of the sulfite producer, adenosine 5'-phosphosulfate reductase, is down-regulated | Solanum lycopersicum |
Cloned(Commentary)
| EC Number | Cloned (Comment) | Organism |
|---|---|---|
| 3.13.1.1 | gene SQD1, relative enzyme expression analysis | Solanum lycopersicum |
Localization
| EC Number | Localization | Comment | Organism | GeneOntology No. | Textmining |
|---|---|---|---|---|---|
| 3.13.1.1 | chloroplast | - |
Solanum lycopersicum | 9507 | - |
Natural Substrates/ Products (Substrates)
| EC Number | Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 3.13.1.1 | UDP-alpha-D-sulfoquinovopyranose + H2O | Solanum lycopersicum | the enzyme catalyzes the reverse reaction | UDP-alpha-D-glucose + sulfite | - |
? |  |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 1.8.3.1 | Solanum lycopersicum | A5H1Q7 | - |
- |
| 3.13.1.1 | Solanum lycopersicum | C0LIR3 | gene SQD1 | - |
Source Tissue
| EC Number | Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|---|
| 3.13.1.1 | leaf | - |
Solanum lycopersicum | - |
Substrates and Products (Substrate)
| EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 3.13.1.1 | UDP-alpha-D-sulfoquinovopyranose + H2O | the enzyme catalyzes the reverse reaction | Solanum lycopersicum | UDP-alpha-D-glucose + sulfite | - |
? | |
Synonyms
| EC Number | Synonyms | Comment | Organism |
|---|---|---|---|
| 3.13.1.1 | SQD1 | - |
Solanum lycopersicum |
Expression
| EC Number | Organism | Comment | Expression |
|---|---|---|---|
| 3.13.1.1 | 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 |
| 3.13.1.1 | 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
| EC Number | General Information | Comment | Organism |
|---|---|---|---|
| 1.8.3.1 | physiological function | during extended dark, sulfite oxidase activity is enhanced in tomato wild-type leaves, while the other sulfite network components are down-regulated. RNA interference treated plants accumulate sulfite, resulting in leaf damage and mortality. Exogenous sulfite application induces up-regulation of the sulfite scavenger activities in dark-stressed or unstressed wild-type plants, while expression of the sulfite producer, adenosine 5'-phosphosulfate reductase, is down-regulated. Unstressed or dark-stressed wild-type plants are resistant to sulfite applications, but enzyme RNA interference plants show sensitivity and overaccumulation of sulfite. Under extended dark stress, SO activity is necessary to cope with rising endogenous sulfite levels. Under nonstressed conditions, the sulfite network can control sulfite levels in the absence of enzyme activity | Solanum lycopersicum |
| 3.13.1.1 | 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 |
| 3.13.1.1 | 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 |
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Release 2023.1 (January 2023)
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