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Literature summary for 1.5.99.12 extracted from
- Cytokinin oxidase is key enzyme of cytokinin degradation (2012), Biochemistry (Moscow), 77, 1354-1361.
Protein Variants
| Protein Variants | Comment | Organism |
|---|---|---|
| additional information | overexpression of the AtCKX genes in tobacco leading to shoot senescence, an increase of the root meristem zone, and enhanced formation of lateral roots | Arabidopsis thaliana |
| additional information | silencing of the OsCKX2 gene of rice cytokinin oxidase | Oryza sativa |
Localization
| Localization | Comment | Organism | GeneOntology No. | Textmining |
|---|---|---|---|---|
| apoplast | isozyme AtCKX4 | Arabidopsis thaliana | 48046 | - |
| apoplast | isozymes OsCKX1 and OsCKX4 | Oryza sativa | 48046 | - |
| apoplast | isozymes ZmCKX1 and ZmCKX2 | Zea mays | 48046 | - |
| cytoplasm | isozyme AtCKX7 | Arabidopsis thaliana | 5737 | - |
| cytoplasm | isozyme OsCKX11 | Oryza sativa | 5737 | - |
| cytosol | isozyme ZmCKX10 | Zea mays | 5829 | - |
| vacuole | isozyme AtCKX1 | Arabidopsis thaliana | 5773 | - |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| cis-zeatin + acceptor + H2O | Zea mays | - |
? | - |
? |  |
| N6-dimethylallyladenine + acceptor + H2O | Hordeum vulgare | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Zea mays | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Populus sp. | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Nicotiana tabacum | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Arabidopsis thaliana | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Oryza sativa | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Physcomitrium patens | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | Selaginella moellendorffii | - |
adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| trans-zeatin + acceptor + H2O | Zea mays | - |
? | - |
? | |
| trans-zeatin + acceptor + H2O | Arabidopsis thaliana | - |
? | - |
? | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Arabidopsis thaliana | - |
isozymes AtCKX1, AtCKX4, and AtCKX7 | - |
| Hordeum vulgare | - |
gene and isozyme HvCKX1 | - |
| Nicotiana tabacum | - |
- |
- |
| Oryza sativa | - |
isozymes OsCKX1, OsCKX4, and OsCKX11 | - |
| Physcomitrium patens | - |
- |
- |
| Populus sp. | - |
- |
- |
| Selaginella moellendorffii | - |
- |
- |
| Zea mays | - |
isoyzmes ZmCKX1, ZmCKX2, and ZmCKX10 | - |
Source Tissue
| Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|
| kernel | - |
Zea mays | - |
| additional information | isozyme AtCKX1 is expressed in all plant organs | Arabidopsis thaliana | - |
| additional information | isozyme ZmCKX1 in reproductive organs | Zea mays | - |
| plant reproductive system | isozyme OsCKX11 | Oryza sativa | - |
| root | isoyzme ZmCKX10 | Zea mays | - |
| root | isozyme AtCKX4 | Arabidopsis thaliana | - |
| root | isozyme OsCKX1 | Oryza sativa | - |
| shoot | isozyme AtCKX4 | Arabidopsis thaliana | - |
| shoot | isozyme OsCKX4 | Oryza sativa | - |
| shoot | isozymes ZmCKX2 and ZmCKX10 | Zea mays | - |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| cis-zeatin + acceptor + H2O | - |
Zea mays | ? | - |
? | |
| cis-zeatin + acceptor + H2O | preferred substrate of isozyme ZmCKX10 | Zea mays | ? | - |
? | |
| N6-(2-isopentenyl)adenine + acceptor + H2O | preferred substrate of isozyme AtCKX4 | Arabidopsis thaliana | ? | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Hordeum vulgare | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Zea mays | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Populus sp. | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Nicotiana tabacum | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Arabidopsis thaliana | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Oryza sativa | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Physcomitrium patens | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| N6-dimethylallyladenine + acceptor + H2O | - |
Selaginella moellendorffii | adenine + 3-methylbut-2-enal + reduced acceptor | - |
? | |
| trans-zeatin + acceptor + H2O | - |
Zea mays | ? | - |
? | |
| trans-zeatin + acceptor + H2O | - |
Arabidopsis thaliana | ? | - |
? | |
| trans-zeatin + acceptor + H2O | preferred substrate of isozymes AtCKX4 and AtCKX1 | Arabidopsis thaliana | ? | - |
? | |
| trans-zeatin + acceptor + H2O | preferred substrate of isozymes ZmCKX1 and ZmCKX10 | Zea mays | ? | - |
? | |
Synonyms
| Synonyms | Comment | Organism |
|---|---|---|
| cytokinin oxidase | - |
Hordeum vulgare |
| cytokinin oxidase | - |
Zea mays |
| cytokinin oxidase | - |
Populus sp. |
| cytokinin oxidase | - |
Nicotiana tabacum |
| cytokinin oxidase | - |
Arabidopsis thaliana |
| cytokinin oxidase | - |
Oryza sativa |
| cytokinin oxidase | - |
Physcomitrium patens |
| cytokinin oxidase | - |
Selaginella moellendorffii |
| HvCKX1 | - |
Hordeum vulgare |
Cofactor
| Cofactor | Comment | Organism | Structure |
|---|---|---|---|
| FAD | - |
Hordeum vulgare | |
| FAD | - |
Zea mays | |
| FAD | - |
Arabidopsis thaliana | |
General Information
| General Information | Comment | Organism |
|---|---|---|
| malfunction | overexpression of the AtCKX genes in tobacco leads to shoot senescence, an increase of the root meristem zone, and enhanced formation of lateral roots | Arabidopsis thaliana |
| malfunction | silencing of the HvCKX1 gene of barley cytokinin oxidase leads to a significant inhibition of cytokinin oxidase activity accompanied by an increase in productivity of this culture | Hordeum vulgare |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Hordeum vulgare |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Zea mays |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Populus sp. |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Nicotiana tabacum |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Arabidopsis thaliana |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Oryza sativa |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Physcomitrium patens |
| physiological function | the enzyme catalyzes the irreversible degradation of cytokinin phytohormones that are extremely necessary for growth, development, and differentiation of plants. Cytokinin oxidase plays an important role in the regulation of levels of cytokinin hormones, the enzyme directly influences cytokinin-regulated physiological processes in plants | Selaginella moellendorffii |
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