Molecular Mechanisms and Labeling Strategies for Protein Lactylation Modification
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Modification group: CH₃CH(OH)CO- (lactyl group)
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Target residue: lysine (K)
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Mass shift: +72.021 Da, a critical parameter for mass spectrometric identification
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This represents the most widely adopted and well-established enrichment strategy.
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However, its performance is highly dependent on antibody quality, requiring rigorous evaluation of specificity and batch reproducibility.
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Lactyl groups can be chemically modified using specific reagents (e.g., NH₂OH treatment), enabling derivatization-based capture or labeling.
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Combined with affinity enrichment approaches such as biotin labeling or magnetic bead pull-down, targeted peptide enrichment can be achieved.
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Although highly promising for site-level investigation, these approaches remain in the developmental stage and are not yet widely adopted.
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Techniques such as SILAC, TMT, and iTRAQ can be integrated with enrichment workflows.
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These approaches facilitate the characterization of dynamic lactylation changes and are particularly suitable for mechanistic studies.
In recent years, with the rapid integration of metabolomics and epigenetics, protein lactylation, an emerging lysine post-translational modification (PTM), has attracted increasing attention from the scientific community. Since its initial discovery reported in Nature in 2019, lactylation has been demonstrated to be widely present in both histone and non-histone proteins, where it plays critical roles in gene expression regulation and cellular metabolic reprogramming.
What Is Protein Lactylation?
Protein lactylation refers to a post-translational modification in which lactate-derived lactyl groups are covalently conjugated to lysine residues of target proteins. Structurally analogous to acetylation, this modification originates from the metabolic intermediate L-lactate and can be catalyzed by acyltransferases or occur through non-enzymatic processes.
1. Molecular Structural Features
2. Biological Significance
Under hypoxic conditions, the Warburg effect, or inflammatory stimulation, intracellular lactate accumulation drives elevated lactylation levels. This modification regulates histone sites such as H3K18 and H4K8 and contributes to transcriptional activation of inflammatory genes including Arg1 and IL-6. Functionally, lactylation is implicated in macrophage polarization, tumor microenvironment remodeling, and stem cell differentiation.
Detection Challenges in Protein Lactylation
Accordingly, optimization of enrichment strategies and the application of high-resolution mass spectrometry platforms are essential for reliable lactylation profiling.
Common Lactylation Labeling and Enrichment Strategies
1. Anti-Kla Immunoprecipitation
Affinity enrichment using anti-Kla antibodies enables selective isolation of lactylated peptides.
2. Chemical Labeling Strategies
To reduce reliance on antibodies, chemical derivatization approaches have been developed to enhance detection efficiency:
3. Stable Isotope Labeling
Stable isotope-based strategies enable quantitative comparison of lactylated proteins across different biological conditions.
Mass Spectrometry-Based Lactylation Proteomics Workflow
At MtoZ Biolabs, we have established an integrated lactylation proteomics workflow combining antibody-based enrichment, high-resolution mass spectrometry, and advanced bioinformatics analysis.
1. Sample Preparation and Protein Extraction
Supports diverse sample types, including tissues, cultured cells, and immune cell lines, with optimized lysis conditions to preserve lactylation stability.
2. Proteolysis and Antibody Enrichment
Standardized trypsin digestion is followed by peptide-level enrichment using rigorously validated anti-Kla antibodies.
3. LC–MS/MS Analysis
Analysis is performed using an Orbitrap Exploris 480 coupled with a nanoLC system, supporting both DDA and DIA acquisition modes with high sensitivity and quantitative robustness.
4. Bioinformatics Analysis
Open database searching based on the UniMod lactylation reference is performed, followed by integrated data processing using tools including but not limited to Proteome Discoverer, MaxQuant, and Spectronaut. Outputs include quantitative protein/site matrices, pathway enrichment analysis, and data visualization.
Advantages of MtoZ Biolabs Lactylation Proteomics Services
Protein lactylation, as an emerging post-translational modification following acetylation and formylation, significantly expands our understanding of metabolic-epigenetic-transcriptional regulatory networks. With continuous advances in mass spectrometry and enrichment technologies, lactylation research is extending beyond histones to diverse signaling pathways and disease models. MtoZ Biolabs is committed to providing precise, high-throughput, and customized proteomics solutions. For inquiries regarding lactylation analysis, mass spectrometry workflows, or experimental design, professional technical support and collaborative consultation are available upon request.
MtoZ Biolabs, an integrated chromatography and mass spectrometry (MS) services provider.
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