Lc-ms Proteomics
Lc-ms Proteomics - Related Videos
09:29
Skeletal Muscle Gender Dimorphism from Proteomics
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Cited by 4 •
2011
A straight-forward set of methods to isolate and determine the identity of the most abundant proteins expressed in skeletal muscle. About 800 spots are discerned on a two-dimensional gel from 10 mg muscle; this allows for the determination of gender-specific protein expression. These methods will give equivalent results in most tissues.
09:20
Proteomic Sample Preparation from Formalin Fixed and Paraffin Embedded Tissue
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Cited by 50 •
2013
Archival formalin fixed and paraffin embedded (FFPE) clinical samples are valuable material for investigation of diseases. Here we demonstrate a sample preparation workflow allowing in-depth proteomic analysis of microdissected FFPE tissue.
14:23
Bottom-up and Shotgun Proteomics to Identify a Comprehensive Cochlear Proteome
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Cited by 6 •
2014
Proteome analysis of the cochlear sensory epithelium can be challenging due to its small size and because membrane proteins are difficult to isolate and identify. Both membrane and soluble proteins can be identified by combining multiple preparative methods and separation techniques along with high-resolution mass spectrometry.
10:55
Digital Microfluidics for Automated Proteomic Processing
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Cited by 30 •
2009
Digital Microfluidics is a technique characterized by the manipulation of discrete droplets (~nL - mL) on an array of electrodes by the application of electrical fields. It is well-suited for carrying out rapid, sequential, miniaturized automated biochemical assays. Here, we report a platform capable of automating several proteomic processing steps.
01:33
Proteomics
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2023
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins. Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
FAQs
LC-MS proteomics gains analytical value by applying two complementary forms of molecular discrimination. Liquid chromatography distributes peptides according to their chemical properties, while mass spectrometry measures the mass-to-charge ratio of the resulting ions. This staged analysis helps researchers examine proteins within complex biological samples and connects separated peptide signals with molecular measurements suitable for identification and comparison.
Fragmentation provides sequence-related evidence beyond a peptide’s intact mass-to-charge measurement. The mass spectrometer can select particular ions and break them into fragments, allowing the resulting pattern to support sequence-based identification. This is important when researchers need to distinguish proteins or peptides that cannot be confidently characterized from mass information alone.
Post-translational modification analysis benefits from the workflow’s ability to examine peptide-level molecular differences and selected-ion fragmentation. Changes associated with modified peptides can be investigated through their measured mass-to-charge values and sequence-based fragment information. In biochemistry, this supports characterization of regulatory protein changes and helps connect molecular modifications with altered cellular pathways.
A typical workflow moves from peptide separation to ion formation, mass-to-charge measurement, and, when selected ions require further characterization, fragmentation. The resulting measurements support peptide or protein identification and quantitative comparison. Keeping these stages conceptually distinct helps researchers interpret whether an observation primarily provides molecular identity, sequence evidence, abundance information, or several of these outcomes together.
Researchers may choose LC-MS proteomics when they need broad protein profiling in complex biological samples or want to compare different biological states. The approach is also suited to biomarker discovery, post-translational modification analysis, and studies of protein function. Its sensitivity and broad molecular coverage can reveal disease-related changes that contribute to pathway-level biochemical interpretation.
Protein and peptide measurements can be interpreted collectively to identify changes associated with cellular pathways rather than viewing each signal in isolation. Comparative profiling may show how biological states differ, while modification analysis can provide additional information about protein regulation. In biochemistry, these results help researchers investigate protein function and clarify molecular changes linked to disease-related processes.