Target Background: BLOC1S3 and the BLOC-1 Complex

BLOC1S3 encodes Subunit 3 of the Biogenesis of Lysosome-Related Organelles Complex-1 (BLOC-1), a hetero-octameric protein complex essential for the biogenesis of specialized lysosome-related organelles (LROs) such as melanosomes, platelet dense granules, and lytic granules. BLOC-1 coordinates endosomal cargo sorting and membrane tubulation, facilitating the transport of cargoes from early endosomes to LROs.

Mutations in BLOC1S3 are associated with Hermansky-Pudlak Syndrome (HPS), a rare autosomal recessive disorder characterized by oculocutaneous albinism, bleeding diathesis, and in some subtypes, pulmonary fibrosis. Research into BLOC1S3 therefore carries significance for understanding organelle biogenesis, vesicular trafficking, and the molecular basis of HPS.

The BLOC1S3 Antibody (Ab351166) enables researchers to detect and study endogenous BLOC1S3 protein expression, localization, and complex assembly across a variety of experimental models.

Recommended Applications and Working Dilutions

The BLOC1S3 Antibody (Ab351166) is supplied in PBS-only formulation and is intended for standard immunoassay techniques. The following applications represent typical uses for antibodies of this class targeting intracellular complex subunits; researchers should perform application-specific optimization:

• Western Blot (WB): Commonly used to confirm BLOC1S3 expression and approximate molecular weight in cell or tissue lysates. Optimize primary antibody dilution empirically, typically starting in the 1:500–1:2000 range.
• Immunofluorescence (IF) / Immunocytochemistry (ICC): Suitable for visualizing subcellular localization of BLOC1S3 in fixed cells. Titrate antibody concentration to minimize background.
• Immunohistochemistry (IHC): May be used on formalin-fixed paraffin-embedded (FFPE) tissue sections with appropriate antigen retrieval steps.
• Immunoprecipitation (IP): Can be used to pull down BLOC1S3 and interacting BLOC-1 complex members from cell lysates.

Note: Specific validated dilutions, host species, clonality, and reactivity data should be confirmed in the product datasheet. Contact Aladdin Scientific technical support for the latest datasheet.

Step-by-Step Western Blot Protocol for BLOC1S3 Antibody

The following protocol provides a general framework for Western Blot detection of BLOC1S3. Optimize conditions for your specific cell or tissue system.

1. Sample Preparation: Lyse cells or homogenize tissue in RIPA buffer supplemented with protease inhibitor cocktail. Determine protein concentration by BCA or Bradford assay. Load 20–40 µg total protein per lane.
2. SDS-PAGE: Separate proteins on a 12–15% polyacrylamide gel under denaturing conditions, then transfer to PVDF or nitrocellulose membrane.
3. Blocking: Block membrane in 5% non-fat dry milk or 5% BSA in TBST for 1 hour at room temperature.
4. Primary Antibody Incubation: Dilute BLOC1S3 Antibody (Ab351166) in blocking buffer. Incubate overnight at 4°C with gentle agitation. Recommended starting dilution: 1:1000 (optimize empirically).
5. Washing: Wash membrane 3 × 10 minutes in TBST.
6. Secondary Antibody Incubation: Incubate with appropriate HRP-conjugated secondary antibody (matched to host species of Ab351166) for 1 hour at room temperature. Wash 3 × 10 minutes in TBST.
7. Detection: Develop using ECL chemiluminescence substrate. Image using darkroom film or digital imaging system.
8. Expected Result: A specific band at the expected molecular weight of BLOC1S3. Include positive control lysate and molecular weight ladder.

Note: Host species and isotype of Ab351166 must be confirmed from the product datasheet to select the correct secondary antibody.

Storage, Handling, and Quality Considerations

Formulation: BLOC1S3 Antibody (Ab351166) is supplied in PBS (phosphate-buffered saline) without preservatives or carrier proteins unless otherwise stated on the datasheet. The absence of additives such as azide or BSA may require additional care during storage and handling.

Storage Conditions:

• Store at -20°C for long-term storage.
• For short-term use (up to 1 month), aliquots may be stored at 4°C.
• Avoid repeated freeze-thaw cycles, which can compromise antibody integrity and reduce binding activity. Prepare single-use aliquots upon first thaw.

Handling Tips:

• Centrifuge vial briefly before opening to collect contents.
• Dilute only the volume required for each experiment.
• Do not use if the solution appears cloudy or if precipitate is visible and cannot be re-dissolved by gentle mixing.

Quality Control: Each lot of BLOC1S3 Antibody undergoes quality testing by the manufacturer. Refer to the Certificate of Analysis (CoA) included with the shipment for lot-specific data. Contact Aladdin Scientific for CoA requests.

Troubleshooting Common Issues

The following troubleshooting guide addresses common challenges when working with BLOC1S3 Antibody (Ab351166):

For unresolved technical issues, contact Aladdin Scientific technical support with your lot number, application details, and protocol description.