ArticlePlant molecular biology2000
Characterization of Ricinus communis phloem profilin, RcPRO1.
Article in Plant molecular biology, 2000. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed, 44 citations in OpenAlex.
- Profilin and Its Isoforms: Unravelling the Functional Diversity Across Life Forms.Current protein & peptide science · 2026Review
- Long-distance mobile mRNA CAX3 modulates iron uptake and zinc compartmentalization.EMBO reports · 2022Article
- Phloem Sap Proteins Are Part of a Core Stress Responsive Proteome Involved in Drought Stress Adjustment.Frontiers in plant science · 2021Article
- ArabidopsisPlant physiology · 2018Article
- Profilin as a regulator of the membrane-actin cytoskeleton interface in plant cells.Frontiers in plant science · 2013Review
- Involvement of the sieve element cytoskeleton in electrical responses to cold shocks.Plant physiology · 2013Article
- Macromolecular composition of phloem exudate from white lupin (Lupinus albus L.).BMC plant biology · 2011Article
- Distinct roles of the first introns on the expression of Arabidopsis profilin gene family members.Plant physiology · 2006Article
- Destination-selective long-distance movement of phloem proteins.The Plant cell · 2005Article
- The characterization of ligand-specific maize (Zea mays) profilin mutants.The Biochemical journal · 2001Article
- Maize profilin isoforms are functionally distinct.The Plant cell · 2000Article
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Authors and funding
6 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The mature, functional sieve tube, which forms the conduit for assimilate distribution in higher plants, is dependent upon protein import from the companion cells for maintenance of the phloem long-distance translocation system. Using antibodies raised against proteins present in the sieve-tube exudate of Ricinus communis (castor bean) seedlings, a cDNA was cloned which encoded a putative profilin, termed RcPRO1. Expression and localization studies indicated that RcPRO1 mRNA encodes a phloem profilin, with some expression occurring in epidermal, cortex, pith and xylem tissue. Purified, recombinant RcPRO1 was functionally equivalent to recombinant maize profilin ZmPRO4 in a live cell nuclear displacement assay. The apparent equilibrium dissociation constant for RcPRO1 binding to plant monomeric (G-)actin was lower than the previously characterized maize profilins. Moreover, the affinity of RcPRO1 for poly-L-proline (PLP) was significantly higher than that for recombinant maize profilins. Within the sieve-tube exudate, profilin was present in 15-fold molar excess to actin. The data suggest that actin filament formation is prevented within the assimilate stream. These results are discussed in terms of the unique physiology of the phloem.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.