ESD Antibody

Introduction to ESD Antibody

ESD antibody refers to a class of antibodies specifically designed to detect and bind to Esterase D (ESD), a serine hydrolase enzyme involved in formaldehyde detoxification processes. The target protein, ESD, is also known by several synonyms including S-formylglutathione hydrolase (FGH), EC 3.1.2.12, esterase 10, methylumbelliferyl-acetate deacetylase, and formylglutathione hydrolase . ESD is a 31 kDa protein encoded by the ESD gene (Gene ID: 2098) in humans . This enzyme plays a crucial role in cellular detoxification pathways, particularly in the metabolism and elimination of formaldehyde.

ESD antibodies are immunological reagents developed to recognize specific epitopes on the ESD protein structure. These antibodies have become indispensable tools in various research applications, including protein detection, localization studies, and functional analyses. The specificity of these antibodies for the ESD protein makes them valuable for investigating the expression, regulation, and function of this enzyme in different biological contexts.

Types and Host Species

Polyclonal ESD antibodies are produced by immunizing rabbits with specific immunogens corresponding to human ESD protein sequences. These antibodies recognize multiple epitopes on the ESD protein, potentially providing stronger signals in certain applications but with possible cross-reactivity issues. The immunogen typically used is a recombinant fusion protein containing a sequence corresponding to amino acids 1-282 of human ESD (NP_001975.1) .

Target Specificity and Reactivity

ESD antibodies are designed to detect endogenous levels of total ESD protein . Most commercially available ESD antibodies demonstrate reactivity with human and mouse samples . The specificity of these antibodies has been validated through various methods, including the use of knockout cell lines. For example, Abcam's EPR8446 antibody was shown to specifically react with ESD in wild-type HEK-293T cells, with a loss of signal observed when tested on ESD knockout HEK-293T cell lines .

The amino acid sequence recognized by many ESD antibodies includes:
"MALKQISSNKCFGGLQKVFEHDSVELNCKMKFAVYLPPKAETGKCPALYWLSGLTCTEQNFISKSGYHQSASEHGLVVIAPDTSPRGCNIKGEDESWDFGTGAGFYVDATEDPWKTNYRMYSYVTEELPQLINANFPVDPQRMSIFGHSMGGHGALICALKNPGKYKSVSAFAPICNPVLCPWGKKAFSGYLGTDQSKWKAYDATHLVKSYPGSQLDILIDQGKDDQFLLDGQLLPDNFIAACTEKKIPVVFRLQEGYDHSYYFIATFITDHIRHHAKYLNA"

Western Blotting Applications

Western blotting (WB) represents one of the primary applications for ESD antibodies, allowing for the specific detection of ESD protein in cell and tissue lysates. The typical dilution range for ESD antibodies in Western blot applications is 1:500 to 1:2000 . These antibodies have been successfully used to detect ESD in various cell lines, including K562, Jurkat, Caco-2, and HeLa cells, with consistent identification of the expected 31 kDa band corresponding to the ESD protein .

In knockout validation studies, ESD antibodies have demonstrated high specificity, with clear signals observed in wild-type samples and absence of signals in ESD knockout samples. For instance, in experiments with HEK-293T cells, the ESD antibody clearly detected the protein in wild-type cells but showed no reactivity in ESD knockout cells .

Immunohistochemistry Applications

ESD antibodies are widely employed in immunohistochemistry (IHC) to visualize the distribution and localization of ESD protein within cells and tissues. For IHC applications using paraffin-embedded sections, the recommended dilution range is typically 1:50 to 1:200 . These antibodies have demonstrated efficacy in detecting ESD in both human and mouse tissue samples, providing insights into the tissue-specific expression patterns of this enzyme.

The application of ESD antibodies in immunohistochemistry has contributed significantly to understanding the spatial distribution of this enzyme in different cellular compartments and tissue types, offering valuable information about its potential functional roles in various physiological and pathological contexts.

ELISA and Flow Cytometry

ESD antibodies are also suitable for enzyme-linked immunosorbent assay (ELISA) applications, enabling quantitative analysis of ESD protein levels in biological samples . Additionally, some ESD antibodies, such as Abcam's EPR8446, have been validated for intracellular flow cytometry applications, allowing for the detection and quantification of ESD in individual cells within heterogeneous populations .

In flow cytometry applications, ESD antibodies have been successfully used at a dilution of 1:10 to label ESD in permeabilized cells, such as Jurkat cells, providing a method for analyzing ESD expression at the single-cell level .

Role in Protein Expression Studies

ESD antibodies have proven valuable in studies examining the expression patterns of Esterase D across different tissues, cell types, and experimental conditions. By enabling the specific detection of ESD, these antibodies have contributed to understanding the differential expression of this enzyme in various physiological and pathological states. Research using ESD antibodies has helped elucidate the tissue-specific distribution of this enzyme, providing insights into its potential functional significance in different biological contexts.

The ability to detect and quantify ESD protein levels using these antibodies has facilitated comparative studies examining how ESD expression changes under different experimental conditions, during development, or in response to various stimuli or treatments. Such studies contribute to a deeper understanding of the regulatory mechanisms governing ESD expression and activity.

Relevance to Disease Research

While not explicitly detailed in the search results, ESD antibodies have potential applications in disease-related research, given the involvement of metabolic enzymes in various pathological processes. The specificity of these antibodies makes them suitable tools for investigating potential alterations in ESD expression or function in disease states.

For instance, the search results mention autoantibody production in autoimmune diseases, suggesting potential relevance for studying immune responses involving ESD . The availability of highly specific ESD antibodies enables researchers to investigate whether this enzyme plays a role in specific disease mechanisms or could serve as a potential biomarker for certain conditions.

Validation Techniques

The specificity and reliability of ESD antibodies are ensured through various validation techniques. One important validation method involves the use of knockout cell lines, where the antibody is tested against wild-type and ESD knockout samples to confirm specificity. As demonstrated with Abcam's EPR8446 antibody, a true ESD-specific antibody should show clear signal in wild-type samples but no signal in knockout samples .

Additional validation methods include:

1. Western blot analysis with multiple cell lines to confirm consistent detection of the expected 31 kDa band

2. Immunohistochemistry with appropriate positive and negative controls

3. Flow cytometry validation against control antibodies

4. Testing for cross-reactivity with related proteins

Specificity Controls

To ensure specificity and minimize false-positive results, ESD antibodies are often supplied with or tested against specific controls. These may include blocking peptides, which are synthetic peptides corresponding to the immunogen used to generate the antibody. When the antibody is pre-incubated with the blocking peptide, its binding to the target protein in the sample should be inhibited, confirming specificity .

Some suppliers also offer negative control antibodies of the same isotype but lacking specificity for ESD, which can be used to distinguish specific staining from background or non-specific binding. These controls are essential for validating experimental results and ensuring the reliability of findings obtained using ESD antibodies.