title: Protein profiling of single epidermal cell types from Arabidopsis thaliana using surface-enhanced laser desorption and ionization technology.
abstract: Here, we describe a novel approach for investigating differential protein expression within three epidermal cell types. In particular, 3000 single pavement, basal, and trichome cells from leaves of Arabidopsis thaliana were harvested by glass micro-capillaries. Subsequently, these single cell samples were joined to form pools of 100 individual cells and analyzed using the ProteinChip technology; SELDI: surface-enhanced laser desorption and ionization. As a result, numerous protein signals that were differentially expressed in the three epidermal cell types could be detected. One of these proteins was characterized by tryptical digestion and subsequent identification via tandem quadrupole-time of flight (Q-TOF) mass spectrometry. Down regulation of this sequenced small subunit precursor of ribulose-1,5 bisphosphate carboxylase(C) oxygenase(O) (RuBisCo) in trichome and basal cells indicates the sink status of these cell types that are located on the surface of A. thaliana source leaves. Based on the obtained protein profiles, we suggest a close functional relationship between basal and trichome cells at the protein level.
authors.affiliation: Max-Planck-Institute of Molecular Plant Physiology, 14776 Potsdam OT Golm, Germany.
authors.forename: Berit
authors.initials: B
authors.lastname: Ebert
authors.forename: Christian
authors.initials: C
authors.lastname: Melle
authors.forename: Elke
authors.initials: E
authors.lastname: Lieckfeldt
authors.forename: Daniela
authors.initials: D
authors.lastname: Zöller
authors.forename: Ferdinand
authors.initials: F
authors.lastname: von Eggeling
authors.forename: Joachim
authors.initials: J
authors.lastname: Fisahn
mesh_terms: D017360:Arabidopsis / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000502:physiology; D019441:Plant Epidermis / Q000166:cytology* / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D029681:Arabidopsis Proteins