iTRAQ and TMT: Isotope Labeling and Tandem Mass Spectrometry Quantitative Analysis

The core of iTRAQ and TMT (Isobaric Tags for Relative and Absolute Quantitation and Tandem Mass Tag) lies in labeling proteins with isotopic tags, allowing for simultaneous comparison of multiple samples in mass spectrometry analysis. iTRAQ and TMT are commonly used techniques in isotopic labeling and tandem mass spectrometry quantitative analysis. These techniques help researchers achieve relative and absolute quantification of proteins in complex biological samples.

 

iTRAQ technology involves labeling the amine groups of proteins using reagents, forming isotopically labeled peptides. These labeled samples are then combined for tandem mass spectrometry analysis to obtain their relative or absolute quantitative information. TMT is similar to iTRAQ but differs in its labeling reagents and chemical structure, often achieving higher multiplexing and precision. The combined use of iTRAQ and TMT allows for the analysis of multiple samples in a single experiment, greatly enhancing experimental efficiency and data comparability.

 

The application of iTRAQ and TMT is mainly reflected in their high-throughput and high-precision protein quantification capabilities, which have been widely used in fields such as medical research, drug development, and agricultural biotechnology. For example, researchers can use iTRAQ and TMT to analyze differences in protein expression in disease tissues, thus helping identify potential disease biomarkers. These techniques are also used to study drug effects and toxicity, guiding new drug development. In agricultural biotechnology, iTRAQ and TMT are used to study protein changes in plants under different environmental conditions, providing data support for crop improvement.

 

1. iTRAQ Technology

1. Principle

iTRAQ (Isobaric Tags for Relative and Absolute Quantitation) technology uses 4 or 8 isotopically encoded tags for quantitative analysis by specifically labeling the amino groups of peptides. iTRAQ reagents include a reporter group, a balance group, and a peptide reactive group. The reporter group has different masses, such as 113Da, 114Da, etc.; the balance group makes different reagent molecules have the same mass; the peptide reactive group connects the reagent to the peptide segment. After labeling, the peptides appear as a single peak in the first mass spectrometry due to having the same mass, while in the second mass spectrometry, the balance group is lost and the reporter group produces reporter ions with different masses, whose intensity represents the relative abundance of the labeled peptides.

 

2. iTRAQ Technology Features

Can accurately compare protein content across up to 8 samples, with labeling efficiency as high as 97%; enables automated and efficient separation through SCX-HPLC; based on high-resolution, high-quality mass spectrometry platforms, can identify up to 6000 proteins and detect special proteins like low-abundance ones; no species-specific limitations.

 

3. Experimental Procedure

First, perform protein digestion on different protein samples, usually using trypsin; then use different iTRAQ labeling reagents to label the digested fragments and mix them; next, use liquid chromatography and mass spectrometry for first and second mass spectrometry analysis; finally, perform bioinformatics analysis on the mass spectrometry data to achieve qualitative and quantitative research.

 

2. TMT Technology

1. Principle

TMT (Tandem Mass Tag) technology is similar to iTRAQ, using 2, 6, 10, or 16 isotopic tags to specifically label the amino groups of peptides. TMT tags consist of a mass reporter, a mass normalization part, and a reactive group. In the first mass spectrometry, labeled peptides from different samples have the same mass-to-charge ratio, while in the second mass spectrometry, the released mass reporter produces different reporter ion peaks, whose intensity reflects the relative expression levels of the peptides in different samples. The mass-to-charge ratio of peptide fragment ion peaks reflects peptide sequence information, thus achieving protein identification and relative quantification.

 

2. TMT Technology Features

Higher throughput, capable of simultaneously labeling 16 different biological samples; minimum mass difference between reporter groups is 6/1000Da, providing higher resolution and reducing experimental error.

 

3. Experimental Procedure

First, perform protein extraction and quality control to ensure the quality and purity of protein samples; then label peptides with TMT reagents; subsequently, use HPLC to separate the labeled peptides; then conduct mass spectrometry analysis; finally, process mass spectrometry data with databases and bioinformatics analysis to obtain qualitative and quantitative results of proteins.

 

Isotopic labeling and tandem mass spectrometry quantitative analysis can simultaneously label and analyze multiple samples, greatly improving research efficiency. Using precise isotopic labeling and mass spectrometry technology, iTRAQ and TMT can provide high-precision protein quantification results.Biotech-Peak BiosciencesProviding high-quality iTRAQ and TMT isotopic labeling and tandem mass spectrometry quantitative analysis services. Our services are dedicated to providing clients with precise protein quantification data, efficiently analyzing complex biological samples. We look forward to collaborating with you to advance scientific progress.

 

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