2.5.1.45: homospermidine synthase (spermidine-specific)
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For detailed information about homospermidine synthase (spermidine-specific), go to the full flat file.
Reaction
Synonyms
homospermidine synthase, HSS, HSS1, synthase, homospermidine, synthase, homospermidine (Senecio vernalis root gene HSS1)
ECTree
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Source Tissue
Source Tissue on EC 2.5.1.45 - homospermidine synthase (spermidine-specific)
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young flower buds, but not mature flowers, express homospermidine synthase and are able to catalyze pyrrolizidine alkaloid biosynthesis
additional information
the enzyme is expressed only in the cells of the lower leaf epidermis and the epidermis of the stem
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HSS is expressed exclusively in nonspecialized cells of the lower epidermis of young leaves and shoots
the enzyme is expressed only in the cells of the lower leaf epidermis and the epidermis of the stem
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HSS expression in leaves directly underneath developing inflorescences
the enzyme is expressed only in the cells of the lower leaf epidermis and the epidermis of the stem
plants activate a second site of HSS expression when inflorescences start to develop. HSS is localized in the bundle sheath cells of young leaves, which express the whole pyrrolizidine alkaloids biosynthetic route
from lower epidermis of leaf and stem, no activity in upper epidermis cells
from lower epidermis of leaf and stem, no activity in upper epidermis cells
from lower epidermis of leaf and stem, no activity in upper epidermis cells
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in young roots, HSS is detected only in cells of the endodermis, but in a later developmental stage, additionally in the pericycle
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gene expression is restricted to young root. Expressed uniformly in all cells of the root cortex parenchyma, but not within the endodermis and exodermis
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gene expression is restricted to young root. Expressed uniformly in all cells of the root cortex parenchyma, but not within the endodermis and exodermis
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expressed in the tips of aerial roots exclusively in mitotically active cells. Raphide crystal idioblasts present within the root apical meristem do not show expression
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in the roots of Eupatorium cannabinum, all cells of the cortex parenchyma are found to express HSS, but not the cells of the endodermis
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HSS is expressed exclusively in nonspecialized cells of the lower epidermis of young leaves and shoots
the enzyme is expressed only in the cells of the lower leaf epidermis and the epidermis of the stem
the enzyme is expressed only in the cells of the lower leaf epidermis and the epidermis of the stem
the enzyme is expressed only in the cells of the lower leaf epidermis and the epidermis of the stem
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the tissue-specific expression of HSS in this boraginaceous species is unique with respect to plant organ, tissue, and cell type, expression patterns, immunohistochemic analysis and semiquantitative RT-PCR, overview
additional information
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the tissue-specific expression of HSS in this boraginaceous species is unique with respect to plant organ, tissue, and cell type, expression patterns, immunohistochemic analysis and semiquantitative RT-PCR, overview
additional information
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not expressed in the aerial parts of the plant like buds, flower heads, leaves, or stems
additional information
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the tissue-specific expression of HSS in this boraginaceous species is unique with respect to plant organ, tissue, and cell type, expression patterns, immunohistochemic analysis and semiquantitative RT-PCR, overview