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Sugar transporters for intercellular exchange and nutrition of pathogens
Using optical glucose sensors, a new class of sugar transporters are identified, named SWEETs, and it is shown that at least six out of seventeen Arabidopsis, two out of over twenty rice and two of seven homologues in Caenorhabditis elegans, and the single copy human protein, mediate glucose transport.
Sucrose Efflux Mediated by SWEET Proteins as a Key Step for Phloem Transport
It is discussed how restriction of intercellular transport to the interface of adjacent phloem cells may be an effective mechanism to limit the availability of photosynthetic carbon in the leaf apoplasm in order to prevent pathogen infections.
ARAMEMNON, a Novel Database for Arabidopsis Integral Membrane Proteins1
A specialized database (DB) for Arabidopsis membrane proteins, ARAMEMNON, was designed that facilitates the interpretation of gene and protein sequence data by integrating features that are presently…
Three Functional Transporters for Constitutive, Diurnally Regulated, and Starvation-Induced Uptake of Ammonium into Arabidopsis Roots
- S. Gazzarrini, L. Lejay, A. Gojon, O. Ninnemann, W. Frommer, N. von Wirén
- Environmental SciencePlant Cell
- 1 May 1999
The results show that high-affinity ammonium uptake in roots is regulated in relation to the physiological status of the plant at the transcriptional level and by substrate affinities of individual members of the AMT1 gene family.
Macromolecular Trafficking Indicated by Localization and Turnover of Sucrose Transporters in Enucleate Sieve Elements
Analysis by in situ hybridization showed that SUT1 mRNA localizes mainly to the SE and is preferentially associated with plasmodesmata, providing evidence for targeting of plant endogenous mRNA and potentially S UT1 protein through phloem plasmidsmata and for sucrose loading at the plasma membrane of SE.
Isolation and characterization of a sucrose carrier cDNA from spinach by functional expression in yeast.
Using an engineered Saccharomyces cerevisiae strain, a cDNA from spinach encoding a sucrose carrier was identified by functional expression and transformed yeast clones were able to grow on media containing sucrose as the sole carbon source.
Arabidopsis LHT1 Is a High-Affinity Transporter for Cellular Amino Acid Uptake in Both Root Epidermis and Leaf Mesophyll[W]
The capacity for amino acid uptake, and thus nitrogen use efficiency under limited inorganic N supply, is increased severalfold by LHT1 overexpression, and the mutant analyses may enhance the understanding of N cycling in plants.
A New Subfamily of Sucrose Transporters, SUT4, with Low Affinity/High Capacity Localized in Enucleate Sieve Elements of Plants
In potato and tomato, SUT4 was immunolocalized specifically to enucleate sieve elements, indicating that like SUT1, macromolecular trafficking is required to transport the mRNA or the protein from companion cells through plasmodesmata into the sieving elements.
SUT2, a Putative Sucrose Sensor in Sieve Elements
The putative sugar sensor identified colocalizes with two other sucrose transporters, differs from them in kinetic properties, and potentially regulates the relative activity of low- and high-affinity sucrose transport into sieve elements.
Plasma membrane microdomains regulate turnover of transport proteins in yeast
The data suggest that release from MCC makes these proteins accessible to the endocytic machinery, and suggests that MCC represents a protective area within the plasma membrane to control turnover of transport proteins.