MtoZ Biolabs uses a high-resolution LC-MS/MS platform to offer the gel-based protein identification service which allows precise identification of protein bands or spots separated on gels. This service is suitable for protein screening, differential analysis, and functional studies, providing reliable data for subsequent mechanism exploration and validation experiments.

Overview

The gel bands refer to protein bands separated by SDS-PAGE, while gel spots originate mainly from protein spots separated bidirectionally by isoelectric point and molecular weight in two-dimensional gels. Gel-based protein analysis is a commonly used strategy that relies on gel electrophoresis to separate and identify proteins. This method can visually display protein migration characteristics, expression differences, and possible modification changes, and clarify protein identity and composition through mass spectrometry identification, providing essential foundational information for subsequent research.

Kim, Y I. et al. BBA - Proteins and Proteomics, 2019.

Figure 1. Prospects of Gel-Based Proteomics.

Gel-Based Protein Identification Service at MtoZ Biolabs

MtoZ Biolabs uses gel-based separation combined with mass spectrometry to provide accurate identification of protein bands or spots, helping to analyze protein composition and characteristics in complex samples.

• Identify the protein identity within gel spots or gel bands
• Detect basic physicochemical properties and peptide information of proteins
• Compare protein expression differences between different samples
• Support further analysis and functional studies of proteins after separation

Our analysis provides a comprehensive understanding of the protein composition in samples, helping researchers accurately pinpoint key proteins and advance subsequent experimental design and scientific exploration.

Workflow of Gel-Based Protein Identification Service

1. Gel Band or Gel Spot Excision

Precisely excise the target protein region from SDS-PAGE gel bands or 2-DE gel spots to ensure a clear sample source.

2. In-Gel Digestion

Use trypsin or other enzymes for digestion to convert in-gel proteins into detectable peptides, improving subsequent mass spectrometry identification efficiency.

3. Peptide Extraction and Purification

Remove interfering substances through decontamination, desalting, and enrichment steps to achieve the purity required for mass spectrometry analysis.

4. LC-MS/MS Analysis

Use high-resolution liquid chromatography-mass spectrometry systems to separate and detect peptides, obtaining reliable MS1 and MS2 data.

5. Database Search and Result Confirmation

Perform sequence matching and protein identification based on mass spectrometry data and output protein IDs, coverage, and characteristic peptide information.

Figure 2. The Workflow of Gel-Based Protein Identification.

Why Choose MtoZ Biolabs?

• High-Sensitivity Detection: Capable of identifying low-abundance proteins in complex matrices, increasing identification depth.
• High-Resolution Separation: Achieves effective protein separation through gel electrophoresis, reducing sample interference.
• Highly Reproducible Workflow: Standardized gel excision and digestion procedures ensure stable and consistent results.
• One-Stop Analytical Capability: Covers all steps from sample processing and gel excision to mass spectrometry identification.
• Customized Analytical Solutions: Adjusts workflow and depth according to sample type and specific research requirements.

Applications of Gel-Based Protein Identification Service

1. Differential Protein Screening and Expression Change Analysis

Used to compare protein expression differences under different treatment conditions, disease states, or time points, enabling rapid identification of key altered proteins.

2. Protein Purity and Component Confirmation

Applicable for verifying contaminants, degradation products, and major components in purified proteins, recombinant proteins, or protein preparations.

3. Validation of Protein Modifications or Cleavage Products

Used to confirm whether an electrophoretic band contains modified proteins, cleavage fragments, or proteins with abnormal migration.

4. Supplementary Validation for Protein Interaction or Complex Analysis

After pull-down, Co-IP, blue native PAGE, and related experiments, used to identify components of complexes or co-precipitated proteins.

5. Biomarker Preliminary Screening Research

Used to discover potential biomarkers from differential gel spots and provide candidate proteins for subsequent quantitative analysis.

Deliverables

• Comprehensive Experimental Details
• Materials, Instruments, and Methods
• Protein Mass Spectrometry Identification Result List
• Mass Spectrometry Images, Gel Images, and Corresponding Protein Spot/Band Number Annotations
• Raw Data Files
• Comprehensive Analysis Report

FAQ

Q1: What types of samples are suitable?

A1: Suitable samples include gel spots or gel bands obtained from SDS-PAGE separation, as well as pretreated protein mixtures. This service is appropriate for samples with low quantities, complex compositions, or cases requiring precise identification of specific bands. For special sample types, please consult us in advance to obtain more accurate handling recommendations.

Q2: What is the service general workflow?

A2:

Q3: What data formats are provided?

A3: MtoZ Biolabs will provide multiple standardized data formats, including:

• Mass spectrometry raw data files (such as .raw or other platform formats)
• Processed protein identification results (Excel/CSV)
• Identification report PDF (including methods, peptide information, confidence evaluation, etc.)
• Figures and visualization results (such as chromatograms and spectra, in PNG/TIFF formats)

If special analytical requirements exist, data formats can be customized according to project specifications.

Q4: How should I prepare my samples?

A4: To achieve the best identification results, we recommend preparing your samples as follows:

• Sample Purity: Avoid components such as salts, elution buffers, and detergents that may interfere with digestion and mass spectrometry analysis.
• Sample Storage: Gel bands or gel spots should be kept moist, sealed with a small amount of pure water or an appropriate buffer to prevent drying and cracking.
• Sample Transportation: Transport under low-temperature conditions (such as with ice packs) and use sealed packaging to prevent contamination or evaporation.
• Additional Information: Please provide loading amounts, marked gel regions, expected protein information (if available), and experimental procedure notes so we can perform more accurate identification.

For more information, please refer to Sample Submission Guidelines for Proteomics, Sample Submission Guidelines for Metabolomics.

Start Your Project with MtoZ Biolabs    

Contact us to discuss your experimental design or request a quote. Whether you need to analyze protein composition, verify candidate bands, or explore key proteins involved in a specific biological process, MtoZ Biolabs can provide professional support.