Detailed Explanation of Activity-Based Protein Profiling (ABPP) Technology Principles
Activity-Based Protein Profiling（ABPP）, i.e., 'Activity-Based Protein Profiling (ABPP)', is a technique focused onthe activity state of proteins, enabling high-throughput identification and quantification of functional proteins. It serves as a critical link between 'protein presence' and 'protein action', especially inenzyme protein research, target discovery, and drug screening, showcasing strong potential in these areas.
1. What is ABPP?
ABPP（Activity-Based Protein Profiling）ABPP is a functional proteomics method based onsmall molecule activity probesandthe active sites of enzyme proteinsthrough specific covalent reactions, achieving enrichment, identification, and quantification of 'proteins in active states'. Unlike proteomics, ABPP does not focus on all proteins but specializes in:
1. 'Active proteins' that are performing biological functions;
2. Specific enzyme families (such as proteases, phosphatases, HDACs, etc.);
3. Dynamic molecules closely related to disease occurrence and signal pathway regulation.
2. Principle Analysis of ABPP Technology
The core of ABPP lies in the specific capture of active enzymes by 'activity site probes', with the specific working mechanism including the following three core components:
1. Activity-Based Probe (ABP)
The probe is the 'weapon' of ABPP, consisting of three parts:
| Component | Function | Common Forms |
| Warhead (Reactive Group) | Covalently binds with enzyme active sites, ensuring labeling occurs only on 'active enzymes' | Epoxide、fluorophosphonate、vinyl sulfone |
| Linker | Provides spatial flexibility, reduces interference, and enhances targeting | PEG chains, organic short chains |
| Reporter | Facilitates subsequent detection or enrichment (e.g., click chemistry, fluorescence, biotin) | Biotin、fluorophore、alkyne/azide |
Probe design needs to be customized for different enzyme types to ensure specificity and stability. For example, serine enzymes commonly use FP-type probes, while cysteine enzymes often use vinyl sulfone-type probes.
2. Mechanism of Probe-Enzyme Binding
(1) After the probe enters the sample,it only reacts covalently with the catalytic site of active enzymes；
(2) Inactive forms (such as enzyme precursors or inhibited state enzymes) are not labeled;
(3) Labeled enzymes can be used for subsequent capture and mass spectrometry detection.
This covalent reaction is a core chemical event balancing selectivity and stability, enabling ABPP to achieve 'state recognition rather than simple recognition”。
3. Enrichment and Detection Process
After labeling, high-throughput analysis is achieved through the following process:
(1) Enrichment of active enzymes using streptavidin magnetic beads (biotin tag) or click chemistry linkers;
(2) Protein digestion (such as trypsin treatment);
(3) Introduction into mass spectrometry (LC-MS/MS) system for peptide identification and quantification;
(4) Obtaining active protein profiles, allowing for comparative analysis of multiple sample groups.
3. Technical Advantages of ABPP
| Technical Features | ABPP Performance |
| Functional Specificity | Only identifies 'active' proteins, truly reflecting functional states |
| Visualization Capability | Supports fluorescence labeling/tissue imaging, balancing quantification and localization |
| Adaptability to Multiple Samples | Applicable to complex samples such as cells, tissues, blood, cerebrospinal fluid, etc. |
| High-throughput analysis | Integration with strategies like TMT and DIA for inter-group activity comparison |
| Drug evaluation applications | Can be used for target validation and off-target effect analysis |
IV. Broad application scenarios of ABPP technology
ABPP has played a key role in the following research areas:
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Disease mechanism research: Mapping enzyme activity profiles in tumors and neurodegenerative diseases
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Drug development and screening: Evaluating candidate molecules for inhibition effects on target enzymes and off-target risks
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Target validation and screening: Identifying truly 'functional' targets in complex systems
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Biomarker discovery: Finding early diagnosis or classification indicators based on activity differences
Biotai Technology ABPP platform service capabilities
Biotai Technology has established a comprehensive ABPP service platform from probe design to mass spectrometry analysisOne-stop ABPP service platform, applicable to various types of research such as human samples, animal models, cell lines, etc.
We provide:
1. Construction and screening of active probe library(Support enzyme-specific customization)
2. Full process service of probe labeling + magnetic bead enrichment + enzymatic mass spectrometry
3. Mass spectrometry analysis on the Orbitrap Exploris 480 platform, high throughput + high sensitivity
4. Providing active protein profiles, target change trends, pathway enrichment reports
Biotai Technology is committed to helping research teams extract information at the 'activity level' of proteins, providing more valuable solutions for target development and mechanism research. Whether studying disease mechanisms or developing precise drugs, ABPP can offer researchers more authentic and useful data support. If you wish to conduct protein activity research, functional target screening, or small molecule validation based on ABPP, feel free to contactBiotai Technology, we will provide you with high-standard, high-efficiency technical services to advance your research further.
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