RAB27A Antibody, HRP conjugated

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Description

Introduction to RAB27A Antibody, HRP Conjugated

RAB27A is a member of the Rab GTPase family, regulating vesicle docking, fusion, and secretion in processes such as cytotoxic granule exocytosis in lymphocytes . Mutations in RAB27A are linked to Griscelli syndrome type 2 (GS2) and hemophagocytic lymphohistiocytosis (HLH) . The HRP-conjugated RAB27A antibody allows direct visualization of this protein in experimental assays, eliminating the need for secondary antibodies and streamlining workflows.

Key Product Characteristics

The Rab27a Antibody (E-8): sc-74586 from Santa Cruz Biotechnology is a well-characterized HRP-conjugated monoclonal antibody.

PropertyDetails
Host SpeciesMouse
CloneE-8
ConjugateHRP
Target SpeciesHuman, Mouse, Rat
ApplicationsWB, IHC(P), ELISA
SpecificityDetects RAB27A at ~25–32 kDa
ValidationVerified in WB, IP, and IHC using knockdown/ectopic expression models

This antibody exhibits no cross-reactivity with unrelated Rab proteins .

Western Blotting

  • Detects RAB27A at 26–32 kDa in lysates from K562 (chronic myelogenous leukemia) and U-87 MG (glioblastoma) cell lines .

  • Specificity confirmed using RAB27A knockout (KO) cell lines, showing reduced or absent bands compared to wild-type controls .

Immunohistochemistry (IHC)

  • Localizes RAB27A to cytoplasmic compartments in formalin-fixed, paraffin-embedded human lymphoma tissues .

  • Used at concentrations of 2–10 µg/mL for optimal signal-to-noise ratios .

Functional Insights

  • Cancer Research: RAB27A promotes colorectal cancer (CRC) proliferation and invasion via ERK/MAPK pathway activation .

  • Immunology: Critical for secretory lysosome exocytosis in hematopoietic cells; dysregulation causes HLH .

Validation and Quality Control

Validation MethodResults
Knockdown Cell Line AnalysisSignificant reduction in RAB27A signal in U-87 MG glioblastoma KD cells .
ImmunoprecipitationBinds endogenous RAB27A in HAP1 cell lysates .
Cross-Reactivity Testing<1% cross-reactivity with recombinant human RAB27B .

Comparative Performance

ParameterHRP-Conjugated sc-74586 Non-Conjugated ab55667 AF7245 Polyclonal
Direct DetectionYes (no secondary needed)NoNo
ApplicationsWB, IHC(P), ELISAWB, IP, ICC/IFWB, ICC
Host SpeciesMouseMouseSheep
Reported Band Size25 kDa25–52 kDa (variants) 32 kDa

Clinical and Research Implications

HRP-conjugated RAB27A antibodies are pivotal in studying:

  • Oncogenesis: Overexpression correlates with poor CRC prognosis .

  • Immune Disorders: GS2 and HLH pathophysiology linked to RAB27A dysfunction .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Typically, we are able to dispatch products within 1-3 working days after receiving your order. Delivery times may vary depending on the purchasing method or location. Please consult your local distributor for specific delivery time information.
Synonyms
GS2 antibody; GTP-binding protein Ram antibody; HsT18676 antibody; MGC117246 antibody; Mutant Ras related protein Rab-27A antibody; Rab-27 antibody; RAB-27A antibody; RAB27 antibody; RAB27A antibody; RAB27A member RAS oncogene family antibody; RAM antibody; Ras-related protein Rab-27A antibody; Ras-related protein Rab27A antibody; RB27A_HUMAN antibody
Target Names
RAB27A
Uniprot No.

Target Background

Function
Rab27A is a small GTPase that cycles between an active GTP-bound state and an inactive GDP-bound state. In its active state, it binds to a variety of effector proteins, playing a crucial role in regulating the homeostasis of the late endocytic pathway, including endosomal positioning, maturation, and secretion. Rab27A is also involved in cytotoxic granule exocytosis in lymphocytes, being essential for both granule maturation and granule docking and priming at the immunologic synapse.
Gene References Into Functions
  1. These findings collectively suggest that the active form of Rab27a enhances human parainfluenza virus type 2 growth by promoting transport of F and HN proteins to the plasma membrane. PMID: 29374787
  2. A novel Rab27a mutation binds melanophilin, but not Munc13-4, causing immunodeficiency without albinism. PMID: 27016801
  3. We reported the first patient with GS2 in Thailand. The patient was compound heterozygous for two novel mutations, c.109A>T (p.K37X) and c.318T>G (p.S106R). We reported the first case of a successful prenatal diagnosis for GS2. The result revealed that the fetus carried the p.K37X, but not the p.S106R (Fig. C), suggesting that the fetus would be unaffected with GS2. PMID: 28484936
  4. Findings indicate that rab GTP-binding proteins Rab27A and Rab27B play significant roles in cell invasion, proliferation, and apoptosis, as well as in chemotherapy resistance. PMID: 28902788
  5. Here, we report on a new RAB27A genetic anomaly observed in seven Saudi Arabia families that had remained negative after extensive molecular genomic DNA testing. Linkage analysis and targeted sequencing of the RAB27A genomic region in several of these patients led to the identification of a common homozygous tandem duplication of 38 kb affecting exon 2-5 and resulting in a premature stop codon PMID: 28585352
  6. In comparison with the normal tissues, miR-182-5p is expressed at a higher level in gastric cancer (GC) tissues, while RAB27A is expressed at a lower level in cancerous tissues. The down-regulation of miR-182-5p and up-regulation of RAB27A can significantly decrease the viability, migration, invasion, and mitosis of HGC-27 cells. PMID: 28546229
  7. Rab27A is mediated by NF-kappaB and promotes stemness of colon cancer cells via up-regulation of cytokine secretion PMID: 27556511
  8. These results demonstrated that miR-145 has an inhibitory role in TNBC malignancy by targeting MMP11 and Rab27a, which might be potential therapeutic and diagnostic targets for TNBC. PMID: 27364572
  9. These signaling pathways can trigger several secretion modes including single WPB release and multigranular exocytosis. In this review, we will give an overview of the WPB lifecycle from biogenesis to secretion and we will discuss several deficiencies that affect the WPB lifecycle. [review] PMID: 28004844
  10. RAB27A, RAB27B and VPS36 are frequently underexpressed in advanced prostate cancer and are inversely correlated with prostate cancer outcome. There seems to be a close relationship in the expression of RAB27A, RAB27B and VPS36, with RAB27A and RAB27B being dependent on VPS36. PMID: 28197629
  11. identified small molecule inhibitors of Rab27a-JFC1 binding that were also active in cell-based neutrophil-specific exocytosis assays, demonstrating the druggability of Rab GTPases and their effectors. PMID: 27702998
  12. MicroRNA-134-3p is a novel potential inhibitor of human ovarian cancer stem cells by targeting RAB27A. PMID: 28043921
  13. decreased expression of Rab27A and Rab27B, especially Rab27A, closely correlated with tumor progression and are valuable prognostic indicators in colorectal cancer patients. PMID: 26760980
  14. We report two unrelated teenagers with hemophagocytic lymphohistiocytosis and an identical heterozygous RAB27A mutation (c.259G-->C). PMID: 26880764
  15. Data suggest that microRNA miR-582-5p may function as a tumor suppressor in the development of colorectal carcinoma (CRC) by targeting RAS-related GTP-binding protein (Rab27a), indicating a novel therapeutic strategy for patients with CRC. PMID: 26384136
  16. Experimental data are reviewed with a focus on the secretory Rab27 family of small GTPases and their implications in cancer progression. PMID: 23665896
  17. miR-122 has a Rab27a-dependent function in the hepatitis C virus lifecycle PMID: 26305877
  18. Rab27A may be used as a valuable prognostic biomarker for colorectal carcinoma patients. PMID: 26070933
  19. Our data indicate that RAB27A expression is an independent prognostic marker for pancreatic ductal adenocarcinoma PMID: 25428385
  20. This study identified a common variant located in RAB27A gene influencing FeNO levels specifically in adults and with a biological relevance to the regulation of FeNO levels. PMID: 25431337
  21. These studies highlight the need for RAB27A sequencing in patients with FHL with normal pigmentation and identify a critical binding site for Munc13-4 on Rab27a, revealing the molecular basis of this interaction. PMID: 25312756
  22. Data show that cystic fibrosis (CF) neutrophils release less secondary and tertiary granule components and that activation of the low-molecular-mass GTP-binding protein Rab27a, involved in the regulation of granule trafficking, is defective. PMID: 24934256
  23. Rab27a was identified as a prognostic biomaker by mRNA profiling, correlated with malignant progression and subtype preference in gliomas. PMID: 24587032
  24. Silencing of the exocytotic RAB family members RAB27A or RAB27B halted miR23b and miR921 secretion and reduced cellular invasion. PMID: 25261234
  25. EPI64, a candidate GAP that is specific for Rab27. PMID: 24673604
  26. Rab27a plays an important role in NET formation induced by both Candida albicans infection and PMA treatment by regulating ROS production. PMID: 24404184
  27. Recruitment of STXBP1 by the Rab27A effector SYTL4 promotes Weibel-Palade body exocytosis. PMID: 24700782
  28. The results showed that Rab27A(Q78L) is unable to localize on mature melanosomes and that its inhibitory activity on melanosome transport is completely dependent on its binding to the Rab27A effector Slac2-a/melanophilin. PMID: 24584932
  29. Exosomes derived from Rab27aoverexpressing cancer cells elicited more potent antitumor immune effects. PMID: 24146068
  30. several crystal structures of the myosin Va or the myosin Vb globular tail domain that gives insights into how the motor is linked to the recycling membrane compartments via Rab11 or the melanophilin adaptor that binds to Rab27a. PMID: 24248336
  31. Rab27a has a key role in eosinophil degranulation. Furthermore, these findings have implications for Rab27a-dependent eosinophil degranulation in airway inflammation. PMID: 23986549
  32. Defects in cargo trafficking caused by mutations in RAB27A and UNC13D genes, encoding Rab27a and its effector Munc13-4, cause severe immunodeficiencies in humans. (Review) PMID: 23810987
  33. Rab27a could improve cell viability, proliferation, and migration of U251 cells and inhibit its apoptosis by promoting secretion of cathepsin D and miR-124 suppression. PMID: 23553027
  34. Upregulation of the Rab27a-dependent lysosomal trafficking and secretory pathways contributes to the correction of some of the cellular defects induced by lysosomal overload in cystinosis, including endoplasmic reticulum stress. PMID: 23716592
  35. Altogether, these results indicate that Rab27a plays an important role in herpes simplex virus 1 infection of oligodendrocytic cells. PMID: 23164453
  36. RAB27A localization and function in melanocytes. [Review] PMID: 23176485
  37. the intrinsically essential role of RAB27A in human ethnic skin color determination PMID: 22844437
  38. Rab27 and Rab3 sequentially regulate human sperm dense-core granule exocytosis, and Rab27 is also required for the acrosome reaction. PMID: 22753498
  39. Upregulated expression of rab4, rab5, rab7, and rab27 correlates with antemortem measures of cognitive decline in individuals with mild cognitve impairment and Alzheimer disease. PMID: 21669283
  40. The pathologic defect in Griscelli syndrome 3 came from the MLPH R35W substitution, which induced aggregation of melanosomes in the perinuclear area of melanocytes because of failure to interact with RAB27A. PMID: 21883982
  41. A Rab27a/MyRIP/myosin Va complex is involved in linking von-Willebrand factor (Vwf) to the peripheral actin cytoskeleton of endothelial cells to allow full maturation and prevent premature secretion of vWF. PMID: 21740491
  42. Data show that point mutations in the binding motif of munc13-4 have severely impaired rab27a binding, allowing dissection of rab27a requirements in munc13-4 function. PMID: 21693760
  43. Rab27a has a role in the CMV life cycle and CMV and LRO biogenesis share common molecular mechanisms PMID: 21170347
  44. Rab27a plays a direct regulatory role in the nascent process of phagocytosis by prolongation of the stage of actin coating via suppression of Coronin 1A. PMID: 21169636
  45. Molecular analysis revealed a novel homozygous mutation in exon 5, namely, a single-base substitution (g.42996 A>G) leading to an amino acid change (S115G) and thus confirming the diagnosis of Griscelli syndrome type 2. PMID: 21314004
  46. Loss of Rab27a increased the fraction of mobile lytic granules and the extent of their movement in the cytosol. PMID: 20877725
  47. TBC1D16 and RAB27A, were identified known drivers of melanoma both are involved in the regulation of vesicular trafficking, which highlights this process as important for proliferation in melanoma. PMID: 21129771
  48. The Rab27A(K22R) mutant normally binds Munc13-4, but not Slp2-a or Slp4-a, whereas the Rab27A(I44T) mutant shows reduced binding activity to Slp2-a and Munc13-4 but normally binds Slp4-a. PMID: 20370853
  49. RAB27A mutations were found in 1 of the 21 families with haemophagocytic syndromes without mutations in familial HLH (FHL) causing genes PMID: 19953648
  50. role in melanosome transport PMID: 11980908

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Database Links

HGNC: 9766

OMIM: 603868

KEGG: hsa:5873

STRING: 9606.ENSP00000337761

UniGene: Hs.654978

Involvement In Disease
Griscelli syndrome 2 (GS2)
Protein Families
Small GTPase superfamily, Rab family
Subcellular Location
Membrane; Lipid-anchor. Melanosome. Late endosome. Lysosome.
Tissue Specificity
Found in all the examined tissues except in brain. Low expression was found in thymus, kidney, muscle and placenta. Detected in melanocytes, and in most tumor cell lines examined. Expressed in cytotoxic T-lymphocytes (CTL) and mast cells.

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