Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata.

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Abstract Text:

S Balachandran,Y Xiang,C Schobert,G A Thompson,W J Lucas,

In angiosperms, the functional enucleate sieve tube system of the phloem appears to be maintained by the surrounding companion cells. In this study, we tested the hypothesis that polypeptides present within the phloem sap traffic cell to cell from the companion cells, where they are synthesized, into the sieve tube via plasmodesmata. Coinjection of fluorescently labeled dextrans along with size-fractionated Cucurbita maxima phloem proteins, ranging in size from 10 to 200 kDa, as well as injection of individual fluorescently labeled phloem proteins, provided unambiguous evidence that these proteins have the capacity to interact with mesophyll plasmodesmata in cucurbit cotyledons to induce an increase in size exclusion limit and traffic cell to cell. Plasmodesmal size exclusion limit increased to greater than 20 kDa, but less than 40 kDa, irrespective of the size of the injected protein, indicating that partial protein unfolding may be a requirement for transport. A threshold concentration in the 20-100 nM range was required for cell-to-cell transport indicating that phloem proteins have a high affinity for the mesophyll plasmodesmal binding site(s). Parallel experiments with glutaredoxin and cystatin, phloem sap proteins from Ricinus communis, established that these proteins can also traffic through cucurbit mesophyll plasmodesmata. These results are discussed in terms of the requirements for regulated protein trafficking between companion cells and the sieve tube system. As the threshold value for plasmodesmal transport of phloem sap proteins falls within the same range as many plant hormones, the possibility is discussed that some of these proteins may act as long-distance signaling molecules.

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Publishing Authors By Initials

S Balachandran,Y Xiang,C Schobert,GA Thompson,WJ Lucas,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Proceedings of the National Academy of Sciences of

VOLUME: 94

Page Numbers: 14150-5

Journal Abbreviation: Proc. Natl. Acad. Sci. U.S.A.

ISSN: 0027-8424

DAY: 9

MONTH: Dec

YEAR: 1997

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 7505876

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata.

AFFILIATION: Section of Plant Biology, Division of Biological Sciences, University of California, Davis, CA 95616, USA.

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Proc Natl Acad Sci U S A

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata Related Publications

• 'Simple surfing' where people can get information on health.
• A modified rapid monoclonal antibody-specific immobilization of platelet antigen assay for the detection of human platelet antigen (HPA) antibodies: a multicentre evaluation.
• A portable resuscitator.
• A randomised controlled trial comparing two autologous fascial sling techniques for the treatment of stress urinary incontinence in women: short, medium and long-term follow-up.
• A study of intravascular brachytherapy treatment planning in peripheral arteries.
• Ability to grow on lipids accounts for the fully virulent phenotype in neutropenic mice of Aspergillus fumigatus null mutants in the key glyoxylate cycle enzymes.
• Alcohol and hepatitis C mortality among males and females in the United States: a life table analysis.
• C-terminal apolipoprotein E-derived peptide, Ep1.B, displays anti-atherogenic activity.
• CARMA3/Bcl10/MALT1-dependent NF-kappaB activation mediates angiotensin II-responsive inflammatory signaling in nonimmune cells.
• Continental variation in relative hippocampal volume in birds: the phylogenetic extent of the effect and the potential role of winter temperatures.
• Decamethonium iodide as a muscle relaxant in anaesthesia.
• Determinants of remaining in the community after discharge: results from New Jersey's Nursing Home Transition Program.
• Diagnosis and treatment of uncommon wounds.
• ECG Biomarkers for Simultaneous Detection of Obstructive Sleep Apnea and Cheyne-Stokes Breathing.
• Evaluation of two antimicrobial therapies in the treatment of Leptospira borgpetersenii serovar hardjo infection in experimentally infected cattle.
• Fast-acting antidepressants: are we nearly there?
• Fuzzy control of ionic polymer-metal composites.
• Gastrointestinal malignancies in HIV-infected or immunosuppressed patients: pathologic features and review of the literature.
• Itakura Distance: A Useful Similarity Measure between EEG and EOG Signals in Computer-aided Classification of Sleep Stages.
• Neural reprogramming in retinal degeneration.
• Neuronal apoptosis and reversible motor deficit in dominant-negative GSK-3 conditional transgenic mice.
• Phloem sap proteins from cucurbita maxima and ricinus communis have the capacity to traffic cell to cell through plasmodesmata.
• Preparing patients for hip and knee replacement surgery.
• Rapid generation of CMV pp65-specific T cells for immunotherapy.
• Reliable change on the Dementia Rating Scale.
• Rethinking nurse education.
• Supervised tissue classification from color images for a complete wound assessment tool.
• Tool/tissues interaction modeling for transluminal angioplasty simulation.
• Unintentional endotrash! "it" happens.
• [Antituberculosis drugs toxicity in patients treated for latent tuberculosis infection.]