title: Mapping the proteome of barrel medic (Medicago truncatula).
abstract: A survey of six organ-/tissue-specific proteomes of the model legume barrel medic (Medicago truncatula) was performed. Two-dimensional polyacrylamide gel electrophoresis reference maps of protein extracts from leaves, stems, roots, flowers, seed pods, and cell suspension cultures were obtained. Five hundred fifty-one proteins were excised and 304 proteins identified using peptide mass fingerprinting and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. Nanoscale high-performance liquid chromatography coupled with tandem quadrupole time-of-flight mass spectrometry was used to validate marginal matrix-assisted laser desorption ionization time-of-flight mass spectrometry protein identifications. This dataset represents one of the most comprehensive plant proteome projects to date and provides a basis for future proteome comparison of genetic mutants, biotically and abiotically challenged plants, and/or environmentally challenged plants. Technical details concerning peptide mass fingerprinting, database queries, and protein identification success rates in the absence of a sequenced genome are reported and discussed. A summary of the identified proteins and their putative functions are presented. The tissue-specific expression of proteins and the levels of identified proteins are compared with their related transcript abundance as quantified through EST counting. It is estimated that approximately 50% of the proteins appear to be correlated with their corresponding mRNA levels.
authors.affiliation: Plant Biology Division, The Samuel Roberts Noble Foundation, PO Box 2180, Ardmore, Oklahoma 73402, USA.
authors.forename: Bonnie S
authors.initials: BS
authors.lastname: Watson
authors.forename: Victor S
authors.initials: VS
authors.lastname: Asirvatham
authors.forename: Liangjiang
authors.initials: L
authors.lastname: Wang
authors.forename: Lloyd W
authors.initials: LW
authors.lastname: Sumner
mesh_terms: D000595:Amino Acid Sequence; D030541:Databases, Genetic; D035264:Flowers / Q000235:genetics / Q000378:metabolism; D005638:Fruit / Q000235:genetics / Q000378:metabolism; D029902:Medicago / Q000166:cytology / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010449:Peptide Mapping / Q000379:methods*; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000378:metabolism; D018547:Plant Stems / Q000235:genetics / Q000378:metabolism; D020543:Proteome / Q000235:genetics / Q000378:metabolism*; D040901:Proteomics / Q000379:methods; D012639:Seeds / Q000235:genetics / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D020543:Proteome