TY - JOUR
T1 - Analysis of transport activity of Arabidopsis sugar alcohol permease homolog AtPLT5
AU - Reinders, Anke
AU - Panshyshyn, Jody A.
AU - Ward, John M.
PY - 2005/1/14
Y1 - 2005/1/14
N2 - The transporters responsible for sugar uptake into non-photosynthetic sink tissues in plants, such as roots and flowers, have not been fully identified and analyzed. Plants encode around 100 putative sugar transporters within the major facilitator superfamily, yet only a few have been studied. Here we report the analysis of a sugar alcohol pennease homolog (AtPLTS, At3g18830) from Arabidopsis. A wide range of sugars including hexoses, pentoses, tetroses, a sugar acid, and sugar alcohols but not disaccharides induced inward currents in oocytes expressing AtPLT5. AtPLTS expression also resulted in 14C-labeled substrate uptake in oocytes, indicating that AtPLT5 encodes an ion-coupled uptake transporter. K0.5 values for glucose and sorbitol were highly dependent on external pH. Expression of AtPLT5 was found primarily in sink tissues: in the elongation zone of roots, in the inflorescence stem, and several floral structures, especially in the floral abscission zone. Expression was induced by mechanical wounding and insect feeding. Analysis of transport properties and expression in Arabidopsis indicate that AtPLT5 functions to transport a wide range of sugars into specific sink tissues in the plant.
AB - The transporters responsible for sugar uptake into non-photosynthetic sink tissues in plants, such as roots and flowers, have not been fully identified and analyzed. Plants encode around 100 putative sugar transporters within the major facilitator superfamily, yet only a few have been studied. Here we report the analysis of a sugar alcohol pennease homolog (AtPLTS, At3g18830) from Arabidopsis. A wide range of sugars including hexoses, pentoses, tetroses, a sugar acid, and sugar alcohols but not disaccharides induced inward currents in oocytes expressing AtPLT5. AtPLTS expression also resulted in 14C-labeled substrate uptake in oocytes, indicating that AtPLT5 encodes an ion-coupled uptake transporter. K0.5 values for glucose and sorbitol were highly dependent on external pH. Expression of AtPLT5 was found primarily in sink tissues: in the elongation zone of roots, in the inflorescence stem, and several floral structures, especially in the floral abscission zone. Expression was induced by mechanical wounding and insect feeding. Analysis of transport properties and expression in Arabidopsis indicate that AtPLT5 functions to transport a wide range of sugars into specific sink tissues in the plant.
UR - http://www.scopus.com/inward/record.url?scp=12544255311&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=12544255311&partnerID=8YFLogxK
U2 - 10.1074/jbc.M410831200
DO - 10.1074/jbc.M410831200
M3 - Article
C2 - 15525644
AN - SCOPUS:12544255311
SN - 0021-9258
VL - 280
SP - 1594
EP - 1602
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 2
ER -