Stp4 (sugar transporter protein 4) is a gene from the model plant, Arabidopsis thaliana. The gene transcribes for an integral membrane protein that is situated in the plasma membrane of sink tissues such as roots, anthers and vascular tissue.
The protein's function is to transport monosaccharide sugars into these sink tissues. The protein is classed as a symporter since sodium ions are also transported concurrently in the same direction. Of special interest to plant scientists is the finding that the transcription of this gene is responsive to environmental stress, more specifically wounding and pathogen infection by the fungal biotroph Erysiphe cichoracearum.
- Truernit E, Schmid J, Epple P, Illig J, Sauer N (December 1996). "The sink-specific and stress-regulated Arabidopsis STP4 gene: enhanced expression of a gene encoding a monosaccharide transporter by wounding, elicitors, and pathogen challenge". Plant Cell. 8 (12): 2169–82. doi:10.1105/tpc.8.12.2169. PMC . PMID 8989877.
- Fotopoulos V, Gilbert MJ, Pittman JK, Marvier AC, Buchanan AJ, Sauer N, Hall JL, Williams LE (June 2003). "The monosaccharide transporter gene, AtSTP4, and the cell-wall invertase, Atbetafruct1, are induced in Arabidopsis during infection with the fungal biotroph Erysiphe cichoracearum". Plant Physiology. 132 (2): 821–9. doi:10.1104/pp.103.021428. PMC . PMID 12805612.
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