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Profilin in Phaseolus vulgaris is encoded by two genes (only one expressed in root nodules) but multiple isoforms are generated in vivo by phosphorylation on tyrosine residues
Author(s) -
Guillén Gabriel,
ValdésLópez Víctor,
Noguez Raúl,
Olivares Juan,
RodríguezZapata Luis Carlos,
Pérez Héctor,
Vidali Luis,
Villanueva Marco A.,
Sánchez Federico
Publication year - 1999
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1999.00542.x
Subject(s) - profilin , biology , biochemistry , gene isoform , tyrosine phosphorylation , tyrosine , phosphorylation , microbiology and biotechnology , actin binding protein , actin , protein tyrosine phosphatase , immunoprecipitation , actin cytoskeleton , cytoskeleton , gene , cell
Summary Actin‐binding proteins such as profilins participate in the restructuration of the actin cytoskeleton in plant cells. Profilins are ubiquitous actin‐, polyproline‐, and inositol phospholipid‐binding proteins, which in plants are encoded by multigene families. By 2D‐PAGE and immunoblotting, we detected as much as five profilin isoforms in crude extracts from nodules of Phaseolus vulgaris . However, by immunoprecipitation and gel electrophoresis of in vitro translation products from nodule RNA, only the most basic isoform of those found in nodule extracts, was detected. Furthermore, a bean profilin cDNA probe hybridised to genomic DNA digested with different restriction enzymes, showed either a single or two bands. These data indicate that profilin in P. vulgaris is encoded by only two genes. In root nodules only one gene is expressed, and a single profilin transcript gives rise to multiple profilin isoforms by post‐translational modifications of the protein. By in vivo 32 P‐labelling and immunoprecipitation with both, antiprofilin and antiphosphotyrosine‐specific antibodies, we found that profilin is phosphorylated on tyrosine residues. Since chemical (TLC) and immunological analyses, as well as plant tyrosine phosphatase (AtPTP1) treatments of profilin indicated that tyrosine residues were phosphorylated, we concluded that tyrosine kinases must exist in plants. This finding will focus research on tyrosine kinases/tyrosine phosphatases that could participate in novel regulatory functions/pathways, involving not only this multifunctional cytoskeletal protein, but other plant proteins.