Recombinant Anti-Syk (phospho Y323) antibody [EP573-4] (ab62338)


  • Product name

    Anti-Syk (phospho Y323) antibody [EP573-4]
    See all Syk primary antibodies
  • Description

    Rabbit monoclonal [EP573-4] to Syk (phospho Y323)
  • Host species

  • Specificity

    This antibody detects Syk phosphorylated at Tyrosine 323.
  • Tested applications

    Suitable for: Flow Cyt, Dot blot, WB, IHC-P, ICC/IFmore details
    Unsuitable for: IP
  • Species reactivity

    Reacts with: Human
  • Immunogen

    A synthetic phosphopeptide corresponding to residues surrounding Tyrosine 323 of human Syk

  • Positive control

    • WB: U937 cell lysates treated with pervanadate. IHC-P: Human lymph node tissue.
  • General notes

    Mouse, Rat: We have preliminary internal testing data to indicate this antibody may not react with these species. Please contact us for more information.

    Our RabMAb® technology is a patented hybridoma-based technology for making rabbit monoclonal antibodies. For details on our patents, please refer to RabMab® patents.

    We are constantly working hard to ensure we provide our customers with best in class antibodies. As a result of this work we are pleased to now offer this antibody in purified format. We are in the process of updating our datasheets. The purified format is designated 'PUR' on our product labels. If you have any questions regarding this update, please contact our Scientific Support team.

    This product is a recombinant rabbit monoclonal antibody.



Our Abpromise guarantee covers the use of ab62338 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Flow Cyt Use at an assay dependent concentration.

ab172730 - Rabbit monoclonal IgG, is suitable for use as an isotype control with this antibody.

Dot blot 1/1000.
WB 1/1000 - 1/2000. Detects a band of approximately 72 kDa (predicted molecular weight: 72 kDa).
IHC-P 1/100 - 1/250. Perform heat mediated antigen retrieval before commencing with IHC staining protocol.
ICC/IF 1/100 - 1/250.
  • Application notes
    Is unsuitable for IP.
  • Target

    • Function

      Non-receptor tyrosine kinase which mediates signal transduction downstream of a variety of transmembrane receptors including classical immunoreceptors like the B-cell receptor (BCR). Regulates several biological processes including innate and adaptive immunity, cell adhesion, osteoclast maturation, platelet activation and vascular development. Assembles into signaling complexes with activated receptors at the plasma membrane via interaction between its SH2 domains and the receptor tyrosine-phosphorylated ITAM domains. The association with the receptor can also be indirect and mediated by adapter proteins containing ITAM or partial hemITAM domains. The phosphorylation of the ITAM domains is generally mediated by SRC subfamily kinases upon engagement of the receptor. More rarely signal transduction via SYK could be ITAM-independent. Direct downstream effectors phosphorylated by SYK include VAV1, PLCG1, PI-3-kinase, LCP2 and BLNK. Initially identified as essential in B-cell receptor (BCR) signaling, it is necessary for the maturation of B-cells most probably at the pro-B to pre-B transition. Activated upon BCR engagement, it phosphorylates and activates BLNK an adapter linking the activated BCR to downstream signaling adapters and effectors. It also phosphorylates and activates PLCG1 and the PKC signaling pathway. It also phosphorylates BTK and regulates its activity in B-cell antigen receptor (BCR)-coupled signaling. In addition to its function downstream of BCR plays also a role in T-cell receptor signaling. Plays also a crucial role in the innate immune response to fungal, bacterial and viral pathogens. It is for instance activated by the membrane lectin CLEC7A. Upon stimulation by fungal proteins, CLEC7A together with SYK activates immune cells inducing the production of ROS. Also activates the inflammasome and NF-kappa-B-mediated transcription of chemokines and cytokines in presence of pathogens. Regulates neutrophil degranulation and phagocytosis through activation of the MAPK signaling cascade. Also mediates the activation of dendritic cells by cell necrosis stimuli. Also involved in mast cells activation. Also functions downstream of receptors mediating cell adhesion. Relays for instance, integrin-mediated neutrophils and macrophages activation and P-selectin receptor/SELPG-mediated recruitment of leukocytes to inflammatory loci. Plays also a role in non-immune processes. It is for instance involved in vascular development where it may regulate blood and lymphatic vascular separation. It is also required for osteoclast development and function. Functions in the activation of platelets by collagen, mediating PLCG2 phosphorylation and activation. May be coupled to the collagen receptor by the ITAM domain-containing FCER1G. Also activated by the membrane lectin CLEC1B that is required for activation of platelets by PDPN/podoplanin. Involved in platelet adhesion being activated by ITGB3 engaged by fibrinogen.
    • Tissue specificity

      Widely expressed in hematopoietic cells (at protein level). Within the B-cells compartment it is for instance expressed for pro-B-cells to plasma cells.
    • Sequence similarities

      Belongs to the protein kinase superfamily. Tyr protein kinase family. SYK/ZAP-70 subfamily.
      Contains 1 protein kinase domain.
      Contains 2 SH2 domains.
    • Domain

      The SH2 domains mediate the interaction of SYK with the phosphorylated ITAM domains of transmembrane proteins. Some proteins like CLEC1B have a partial ITAM domain (also called hemITAM) containing a single YxxL motif. The interaction with SYK requires CLEC1B homodimerization.
    • Post-translational

      Ubiquitinated by CBLB after BCR activation; which promotes proteasomal degradation.
      Autophosphorylated. Phosphorylated on tyrosine residues by LYN following receptors engagement. Phosphorylation on Tyr-323 creates a binding site for CBL, an adapter protein that serves as a negative regulator of BCR-stimulated calcium ion signaling. Phosphorylation at Tyr-348 creates a binding site for VAV1. Phosphorylation on Tyr-348 and Tyr-352 enhances the phosphorylation and activation of phospholipase C-gamma and the early phase of calcium ion mobilization via a phosphoinositide 3-kinase-independent pathway (By similarity). Phosphorylation on Ser-297 is very common, it peaks 5 minutes after BCR stimulation, and creates a binding site for YWHAG. Phosphorylation at Tyr-630 creates a binding site for BLNK. Dephosphorylated by PTPN6.
    • Cellular localization

      Cell membrane. Cytoplasm, cytosol.
    • Information by UniProt
    • Database links

    • Alternative names

      • EC antibody
      • kinase Syk antibody
      • KSYK antibody
      • KSYK_HUMAN antibody
      • p72-Syk antibody
      • p72syk antibody
      • Spleen tyrosine kinase antibody
      • Syk antibody
      • Tyrosine protein kinase SYK antibody
      • Tyrosine-protein kinase SYK antibody
      see all


    • All lanes : Anti-Syk (phospho Y323) antibody [EP573-4] (ab62338) at 1/2000 dilution

      Lane 1 : untreated U937 cell lysates
      Lane 2 : U937 cell lysates treated with pervanadate.

      Lysates/proteins at 10 µg per lane.

      All lanes : goat anti-rabbit, HRP labeled, at 1/2000 dilution

      Predicted band size: 72 kDa
      Observed band size: 72 kDa

      Beta tubulin shows equal lysate loading amount per lane.
    • Flow Cytometry analysis of U937 (human monocyte histiocytic lymphoma) treated (red)/untreated (green) with 1mM pervanadate for 30 minutes with purified ab62338 at 1/2500 dilution. The secondary antibody was Goat anti rabbit IgG (Alexa Fluor® 488) at 1/2000 dilution. A Rabbit monoclonal IgG (Black) was used as the isotype control and cells without incubation with primary antibody and secondary antibody (Blue) were used as unlabeled control.

    • Immunocytochemistry/Immunofluorescence analysis of Ramos+/-pervanadate(1mM, 30min), Ramos + pervanadate(1mM, 30min) + LP labelling Syk (phospho Y323) with ab62338 at a dilution of 1:1000 dilution (2.53ug/ml). Cells were fixed with 4% Paraformaldehyde and permeabilized with 0.1% tritonX-100. ab150077 Goat anti rabbit IgG(Alexa Fluor® 488) (1:1000) was used as the secondary antibody. The cells were co-stained with ab195889 Anti-alpha Tubulin antibody [DM1A] - Microtubule Marker (Alexa Fluor® 594) 1:200 (2.5 μg/ml). Nuclei counterstained with DAPI (blue). Control: PBS instead of the primary antibody.

    • Dot blot analysis of Sky (pY323) peptide (Lane 1), Syk (unmodified) peptide (Lane 2), labelling Syk (pY323) with ab62338 at a dilution of 1/1000. Peroxidase conjugated goat anti-rabbit IgG (H+L) was used as the secondary antibody at a dilution of 1/2500.

      Blocking and dilution buffer: 5% NFDM/TBST.

      Exposure time: 10 seconds.

    • All lanes : Anti-PPP1A/PPP1CA (phospho T320) antibody [EP1512Y] (ab62334) at 1/5000 dilution (Diluted with 5% NFDM /TBST)

      Lane 1 : Ramos (human Burkitt's lymphoma B lymphocyte) whole cell lysate with 5% NFDM/TBST
      Lane 2 : Ramos treated with 1mM pervanadate for 30min whole cell lysate with 5% NFDM/TBST
      Lane 3 : Ramos treated with 1mM pervanadate for 30min whole cell lysate. Then the membrane was incubated with alkaline phosphatase. with 5% NFDM/TBST

      Lysates/proteins at 10 µg per lane.

      All lanes : Goat Anti-Rabbit IgG H&L (HRP) (ab97051) at 1/100000 dilution (Goat Anti-Rabbit IgG, (H+L), Peroxidase conjugated)

      Predicted band size: 72 kDa


    This product has been referenced in:

    • Wang WG  et al. MYC protein dysregulation is driven by BCR-PI3K signalling in diffuse large B-cell lymphoma. Histopathology 71:778-785 (2017). Read more (PubMed: 28639315) »
    • Boros K  et al. Increased SYK activity is associated with unfavorable outcome among patients with acute myeloid leukemia. Oncotarget 6:25575-87 (2015). IHC . Read more (PubMed: 26315286) »
    See all 5 Publications for this product

    Customer reviews and Q&As

    1-2 of 2 Abreviews or Q&A


    Thank you for your reply and for the additional information.

    Unfortunately we do not have the positive control U937 cell lysates treated with pervanadate to see out, but I would recommend testing the antibody with a positive control if you're unsure whether your samples contain the phosphorylated antigen. I wouldalso recommend using BSA instead of milk during your blocking and incubation steps, however I would be happy to send a different positive control or a fresh lot of the antibody if this will be helpful to you.

    I look forward to hearing from you. Please let me know if you have any questions or if there is anything else that we can do for you.

    Read More


    Thank you for contacting us and letting us know about the trouble with this antibody.

    I have looked through our records and we haven't received other reports of this antibody not working, so I don't believe that it is a problem with the lot. I have a couple of additional questions, so that I may be able to help improve the results:

    1) What kind of phosphatase inhibitors wereincluded in the lysis buffer?
    2) How were the PBMC samples collected and prepared? Were they kept on ice?
    3) Are you sure that the PBMC's contain SYK that is phosphorylated on Y323? If not, were the cells treated to induce phosphorylation?
    4) What was your order number or PO number used to order this antibody?

    We also would recommend using BSA instead of milk in all blocking and antibody incubation steps, as milk contains endogenous phosphatases that can interfere with phospho-specific antibody detection.

    I look forward to hearing from you. We do fully guarantee this antibody in Western blot with human samples, so I would be happy to send a replacement or issue a credit or refund if you would prefer. Please let me know if you have any questions or if there is anything else that we can do for you.

    Read More

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