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Purification and proteomic characterization of plastids from Brassica napus developing embryos
Author(s) -
Jain Renuka,
Katavic Vesna,
Agrawal Ganesh Kumar,
Guzov Victor M.,
Thelen Jay J.
Publication year - 2008
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.200700810
Subject(s) - plastid , organelle , biology , biochemistry , proteome , chloroplast , embryo , storage protein , brassica , microbiology and biotechnology , botany , gene
Plastids are functionally and structurally diverse organelles responsible for numerous biosynthetic reactions within the plant cell. Plastids from embryos have a range of properties depending upon the plant source but compared to other plastid types are poorly understood and therefore, we term them embryoplasts. Isolating intact plastids from developing embryos is challenging due to large starch granules within the stroma and the prevalence of nonplastid, storage organelles (oil bodies and protein storage vacuoles) which compromise plastid integrity and purity, respectively. To characterize rapeseed embryoplasts it was necessary to develop an improved isolation procedure. A new method is presented for the isolation of intact plastids from developing embryos of Brassica napus seeds. Intactness and purity of embryoplast preparations was determined using phase‐contrast and transmission electron microscopy, immunoblotting, and multidimensional protein identification technology (MudPIT) MS/MS. Eighty nonredundant proteins were identified by MudPIT analysis of embryoplast preparations. Approximately 53% of these proteins were components of photosystem, light harvesting, cytochrome b / f , and ATP synthase complexes, suggesting ATP and NADPH production are important functions for this plastid type.