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. 1990 Jan;92(1):88–96. doi: 10.1104/pp.92.1.88

Identification of the Large Subunit of Ribulose 1,5-Bisphosphate Carboxylase/Oxygenase as a Substrate for Transglutaminase in Medicago sativa L. (Alfalfa) 1

Stephen A Margosiak 1, Abdi Dharma 1, Megan R Bruce-Carver 1, Andrea P Gonzales 1, Donna Louie 1, Glenn D Kuehn 1
PMCID: PMC1062252  PMID: 16667270

Abstract

Extracts prepared from floral meristematic tissue of alfalfa (Medicago sativa L.) were investigated for expression of the enzyme transglutaminase in order to identify the major protein substrate for transglutaminase-directed modifications among plant proteins. The large polymorphic subunits of ribulose 1,5-bisphosphate carboxylase/oxygenase in alfalfa, with molecular weights of 52,700 and 57,600, are major substrates for transglutaminase in these extracts. This was established by: (a) covalent conjugation of monodansylcadaverine to the large subunit followed by fluorescent detection in SDS-polyacrylamide gels; (b) covalent conjugation of [14C]putrescine to the large subunit with detection by autoradiography; (c) covalent conjugation of monodansylcadaverine to the large subunit and demonstration of immunocross-reactivity on nitrocellulose transblot of the modified large subunit with antibody prepared in rabbits against dansylated-ovalbumin; (d) demonstration of a direct dependence of the rate of transglutaminase-mediated, [14C]putrescine incorporation upon the concentration of ribulose, 1,5-bisphosphate carboxylase/oxygenase from alfalfa or spinach; and (e) presumptive evidence from size exclusion chromatography that transglutaminase may cofractionate with native molecules of ribulose 1,5-bisphosphate carboxylase/oxygenase in crude extracts. Analysis of the primary structure of plant large subunit has revealed numerous potential glutaminyl and lysyl sites for transglutaminase-directed modifications of ribulose 1,5-bisphosphate carboxylase/oxygenase.

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Selected References

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