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- W16594834 abstract "Antimicrobial proteins have been isolated from a wide range of plant species. More recently, it has become increasingly clear that these types of proteins play an important role in the protection of plants. In this study, we investigate the presence of defense-related proteins from passion fruit (Passiflora edulis f. flavicarpa) seeds. Initially, seed flour was extracted for 2 h (at 4 °C) with phosphate buffer, pH 5.5. The precipitate obtained between 0 and 70% relative ammonium sulfate saturation was re-dissolved in distilled water and heated at 80 °C for 15 min. The resulting suspension was clarified by centrifugation and the supernatant (F/0–70) was extensively dialyzed. A Sephadex G-50 size exclusion column was employed for further separation of proteins. The fraction with antifungal activity was pooled and submitted to CM-Sepharose cation exchange. Two proteins, named Pf1 and Pf2, were eluted in 0.1 and 0.2 M of salt, respectively, and submitted to reverse-phase chromatography in HPLC. This fraction inhibited the growth, in an in vitro assay, of the phytopathogenic fungi Fusarium oxysporum and colletotrichum lindemuthianum and the yeast Saccharomyces cerevisiae and strongly inhibited glucose-stimulated acidification of the medium by F. oxysporum in a dose-dependent manner. The molecular masses of these proteins, referred to now as Pf1-RP and Pf2-RP, were obtained by MALDI-TOF spectrometry and corresponded to 12,088 Da for Pf1-RP and 11,930 Da for Pf2-RP. These proteins were also subjected to automated N-terminal amino acid sequencing. Sequence comparisons for the heavy subunit of Pf2-RP showed the presence of a protein with a high degree of homology to storage 2S albumins." @default.
- W16594834 created "2016-06-24" @default.
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- W16594834 date "2001-12-01" @default.
- W16594834 modified "2023-10-12" @default.
- W16594834 title "Are storage 2S albumins also defensive proteins?" @default.
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- W16594834 doi "https://doi.org/10.1006/pmpp.2001.0365" @default.
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