Anti-ECE-2 Rabbit Polyclonal Antibody

Frequently Asked Questions

What is the expected molecular weight for ECE-2 on Western blot?

ECE-2 typically migrates at approximately 95-105 kDa on Western blot, reflecting the full-length membrane-bound glycoprotein. The mature enzyme contains N-linked glycosylation sites that contribute to heterogeneity in apparent molecular weight. In some lysates you may observe additional bands corresponding to differentially glycosylated forms or proteolytic fragments. Treatment with PNGase F can help confirm glycosylation status if band complexity is an issue. Always include a positive control lysate from ECE-2-expressing tissue or transfected cells, as endogenous expression levels vary considerably across cell types.

What dilution should I start with for ECE-2 Western blot?

We recommend starting at 1:1000 dilution for Western blot with this rabbit polyclonal ECE-2 antibody, which has been validated at that concentration. For low-expressing samples, you may need to increase antibody concentration to 1:500 or increase protein load per lane to 40-50 µg. Neural tissue lysates typically give stronger signals than peripheral tissues due to ECE-2 expression patterns. Optimize blocking conditions using five percent non-fat milk or BSA in TRIS-buffered saline with Tween-20, and expect overnight incubation at four degrees Celsius to yield best results.

Does ECE-2 antibody cross-react with ECE-1?

ECE-1 and ECE-2 share approximately 60 percent sequence identity and belong to the same metalloprotease family, raising concerns about cross-reactivity. This antibody was raised against ECE-2-specific epitopes, but we recommend including parallel samples with ECE-1 knockout or knockdown controls if both enzymes are expressed in your system. ECE-1 migrates at similar molecular weight, so distinguishing them by size alone is unreliable. If you are working in tissues where both are abundant, consider using lysates from cells overexpressing each isoform individually to assess specificity under your exact experimental conditions.

Is this ECE-2 antibody suitable for detecting mouse or rat ECE-2?

This antibody has been validated for human ECE-2. Cross-reactivity with mouse and rat ECE-2 is predicted based on sequence homology in the immunogen region, but has not been formally validated by us. Human and rodent ECE-2 share high conservation in the catalytic and structural domains. If you are working with mouse or rat samples, we recommend testing the antibody at the suggested 1:1000 dilution initially, but include appropriate positive controls such as transfected cell lysates or tissues known to express ECE-2. Confirm specificity with blocking peptide or siRNA knockdown controls in your target species.

What sample preparation is best for detecting intracellular ECE-2?

ECE-2 localizes primarily to the trans-Golgi network and endosomal compartments rather than the plasma membrane, so total cell lysis protocols work well. Use RIPA buffer or similar detergent-containing lysis buffer with protease inhibitors to efficiently extract membrane-associated ECE-2. Avoid harsh sonication that may degrade the protein. For immunofluorescence applications, fix cells with four percent paraformaldehyde and permeabilize with 0.1-0.5 percent Triton X-100 to allow antibody access to intracellular compartments. Subcellular fractionation can enrich ECE-2 in membrane fractions if you are working with low-abundance samples.

What positive control tissue should I use for ECE-2 expression?

ECE-2 is expressed primarily in neural tissues, with brain lysates serving as a reliable positive control for Western blot validation. Within the brain, expression is particularly enriched in regions involved in pain and reward pathways. Human brain-derived cell lines or primary neuronal cultures are suitable alternatives if whole tissue lysates are unavailable. For non-neural applications, consider HEK293 or other mammalian cells transiently transfected with ECE-2 expression constructs. Endogenous ECE-2 levels are generally low in most peripheral tissues and immortalized cell lines, so negative results should be interpreted cautiously without a validated positive control.

How should I store this ECE-2 antibody for long-term stability?

Store the antibody at minus twenty degrees Celsius for routine use up to six months. For longer-term storage beyond six months, aliquot upon arrival and store at minus eighty degrees Celsius to preserve activity through multiple freeze-thaw cycles. Avoid repeated freeze-thaw cycles, as rabbit polyclonal antibodies can lose titer and increase background with each cycle. If you use the antibody frequently, keep a working aliquot at four degrees Celsius with 0.02-0.05 percent sodium azide as preservative for up to one month. Do not store in frost-free freezers, as temperature cycling degrades antibody performance over time.

Can I use this antibody for immunohistochemistry on ECE-2 in tissue sections?

This antibody is suitable for immunohistochemistry, though specific validation for ECE-2 IHC has not been completed in our facility. For paraffin-embedded sections, antigen retrieval is typically essential because ECE-2 epitopes can be masked by fixation. Try citrate buffer pH 6.0 with heat-induced epitope retrieval as a starting point. ECE-2 localizes intracellularly, so ensure adequate permeabilization during your staining protocol. Start with antibody dilution around 1:100 to 1:200 for IHC, which is more concentrated than Western blot applications. Include appropriate blocking steps and negative controls using adjacent sections with primary antibody omitted or preabsorbed with blocking peptide.