Peptide Mass Fingerprinting
Peptide Mass Fingerprinting - Related Videos
09:26
Species Determination and Quantitation in Mixtures Using MRM Mass Spectrometry of Peptides Applied to Meat Authentication
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Cited by 4 •
2016
We present a protocol for identifying and quantifying the components in mixtures of species possessing similar proteins. Mass spectrometry detects peptides for identification, and gives relative quantitation by ratios of peak areas. As a tool food for fraud detection, the method can detect 1% horse in beef.
06:09
Quantification of Proteins Using Peptide Immunoaffinity Enrichment Coupled with Mass Spectrometry
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Cited by 37 •
2011
Stable Isotope Standards and Capture by Anti-Peptide Antibodies (SISCAPA) couples affinity enrichment of peptides with stable isotope dilution mass spectrometry (MRM-MS) to provide quantitative measurement of peptides as surrogates for their respective proteins. Here we describe the protocol using magnetic particles in a partially automated format.
01:33
Peptide Identification Using Tandem Mass Spectrometry
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2023
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties. This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
07:28
Enrichment of Extracellular Matrix Proteins from Tissues and Digestion into Peptides for Mass Spectrometry Analysis
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Cited by 133 •
2015
This protocol describes a procedure for enriching ECM proteins from tissues or tumors and deglycosylating and digesting the ECM-enriched preparations into peptides to analyze their protein composition by mass spectrometry.
06:48
Fingerprinting Cardiolipin in Leukocytes by Mass Spectrometry for a Rapid Diagnosis of Barth Syndrome
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Cited by 3 •
2022
This protocol shows how to obtain a mass spectrometric "fingerprint" of leukocyte cardiolipin for the diagnosis of Barth syndrome. The assessment of elevated monolysocardiolipin to cardiolipin ratio discriminates patients with Barth syndrome from control heart failure patients with 100% sensitivity and specificity.
FAQs
The informative feature is the combined pattern of peptide masses produced from a protein, rather than any single peptide measurement. Because the pattern reflects the protein’s underlying sequence after digestion, it can serve as a characteristic molecular signature. Comparing that signature with reference patterns allows researchers to distinguish candidate proteins in complex biological or environmental samples.
Trypsin commonly provides the enzymatic digestion step that converts an intact protein into a collection of peptides suitable for measurement. The resulting peptide set carries the mass pattern used for identification. Using a defined digestion approach helps connect the measured peptides with theoretical patterns generated from protein sequences in databases.
A database search compares the experimentally measured peptide-mass list with theoretical peptide patterns calculated from stored protein sequences. The protein whose predicted pattern best corresponds to the observed measurements becomes an identification candidate. This step links an instrumental result to a biological protein name and makes sequence databases central to interpretation.
Mass spectrometry supplies the measured masses of the peptides produced during digestion. Those measurements form the experimental list that is evaluated against theoretical patterns, turning the digested sample into data suitable for protein identification. In environmental studies, this measurement connects molecular composition with proteins originating from microorganisms or broader environmental samples.
In environmental research, the approach can identify proteins present in samples containing microorganisms or mixed biological material. These identifications help characterize the proteins associated with microbial communities, providing molecular information about the organisms and processes represented in the sample. The method therefore supports interpretation of environmental biology beyond simply detecting a single purified protein.
Protein identities can provide evidence about biochemical responses occurring in environmental systems. When researchers relate the detected proteins to the sample’s biological context, the results help connect molecular composition with ecosystem processes and environmental change. This makes peptide-based protein identification useful for examining how microbial or environmental systems respond at the biochemical level.
Peptide mass fingerprinting provides protein-identification information, but its results can be interpreted alongside other proteomic and analytical methods. Combining approaches broadens the evidence available from an environmental sample and helps relate identified proteins to microbial communities, biochemical responses, and ecosystem processes. Its value is therefore complementary, supporting a more integrated view of environmental molecular composition.