Dataset Information

Stadard peptide mixture plus HeLa

ABSTRACT: To test our peak detection and label-free quantitation algorithm, practical applications of AB3D for LC-MS data sets were evaluated using a standard peptide mixture consisting of bovine serum albumin (BSA) peptides with different concentrations, peptides derived from four standard proteins (data set 1), and complex peptide samples derived from HeLa cells and BSA (data set 2).

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Homo Sapiens (human) Bos Taurus (bovine)

TISSUE(S): Serum, Hela Cell

SUBMITTER: Ken Aoshima

LAB HEAD: Ken Aoshima

PROVIDER: PXD001259 | Pride | 2014-12-04

REPOSITORIES: Pride

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Publications

A simple peak detection and label-free quantitation algorithm for chromatography-mass spectrometry.

Aoshima Ken K Takahashi Kentaro K Ikawa Masayuki M Kimura Takayuki T Fukuda Mitsuru M Tanaka Satoshi S Parry Howell E HE Fujita Yuichiro Y Yoshizawa Akiyasu C AC Utsunomiya Shin-Ichi S Kajihara Shigeki S Tanaka Koichi K Oda Yoshiya Y

BMC bioinformatics 20141125

<h4>Background</h4>Label-free quantitation of mass spectrometric data is one of the simplest and least expensive methods for differential expression profiling of proteins and metabolites. The need for high accuracy and performance computational label-free quantitation methods is still high in the biomarker and drug discovery research field. However, recent most advanced types of LC-MS generate huge amounts of analytical data with high scan speed, high accuracy and resolution, which is often impo ...[more]

PMID: 25420746

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Project description:A critical step in regeneration is recreating the cellular identities and patterns of lost organs long after embryogenesis is complete. In plants, perpetual (indeterminate) organ growth occurs in apical stem cell niches, which have been shown to re-establish quickly when damaged or removed (1,2). Here we ask whether the machinery of perpetual organ growth, stem cell activity, is needed for the phase of regeneration that leads to replenishing lost cell identities and patterning, or, whether organ re-establishment enlists a wider group of pluripotent cells. We adapt a root tip regeneration system to Arabidopsis that permits us to assess the molecular and functional recovery of specific cell fates during organ regeneration. These results suggest a rapid restoration of missing cell fate and function in advance of the recovery of stem cell activity. Surprisingly, plants with mutations that fail to maintain stem cell activity were able to re-pattern their distal tip and re-specify lost cell fates. Thus, although stem cell activity is required to resume indeterminate growth (3), our results show it is not necessary for cell re-specification and patterning steps. This implies a regeneration mechanism that coordinates patterning of the whole organ, as in embryogenesis, but is initiated from different starting morphologies. 1. Feldman, L. J. Denovo Origin of Quiescent Center Regenerating Root Apices of Zea-Mays. Planta 128, 207-212 (1976). 2. Xu, J. et al. A molecular framework for plant regeneration. Science 311, 385-8 (2006). 3. Gordon, S. P. et al. Pattern formation during de novo assembly of the Arabidopsis shoot meristem. Development 134, 3539-48 (2007). We adapted root tip excision techniques to Arabidopsis, enabling us to perform microarray profiling of regenerating root tissue. Excisions were performed at 4 days post-germination (dpg) at a distance of 130 um from the root tip, resulting in the complete excision of QC, all surrounding stem cells along with several tiers of daughter cells, and the root cap, including all of the columella and most of the lateral root cap. The tip section and then approximately 70 um of regenerating tissue was recut at different time points post cutting. We sampled regenerating stumps at 0hrs, 5 hrs, 13 hrs, 22 hrs, and 7 days after the excision for microarray analysis (Methods). We also sampled root sections immediately above the zone competent to regenerate at 270 um to approximately 340 um. Experiment Overall Design: 30 samples with 4 or 3 replicates for each condition representing a time course of regenerating root stumps and including controls for root tips (regeneration endpoint) at 4 dpg and 8 dpg and a wounded set of samples representing root tissue at 270-340 mm from the root tip for non-regeneration control

Dataset Information

Stadard peptide mixture plus HeLa

Publications

A simple peak detection and label-free quantitation algorithm for chromatography-mass spectrometry.

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