dgk-5 Antibody

DGK5 in Plant Immunity

• Function: DGK5 phosphorylates diacylglycerol (DAG) to produce phosphatidic acid (PA), a lipid messenger critical for reactive oxygen species (ROS) production and pathogen resistance .

• Mutant Phenotypes:

  • dgk5 mutants exhibit reduced ROS bursts, impaired callose deposition, and increased susceptibility to bacterial pathogens like Pseudomonas syringae .

  • PA derived from DGK5 stabilizes RBOHD (Respiratory Burst Oxidase Homolog D), enhancing ROS production and stomatal immunity .

• Localization: GFP-DGK5 fusion proteins localize to the plasma membrane, colocalizing with RBOHD and PLC2 .

DGKζ in Mammalian Systems

• Immune Modulation: DGKζ regulates T-cell responses by dampening DAG signaling, thereby suppressing excessive immune activation. Inhibition of DGKζ enhances T-cell receptor (TCR) signaling and antitumor responses .

• Disease Links: Alterations in DGKζ activity are implicated in immune disorders, including asthma and cancer .

Case Study: ab105195 (Anti-DGKζ)

• Western Blot: Detects DGKζ at ~124 kDa in HeLa and 293T lysates .

• Immunohistochemistry: Strong staining in human breast carcinoma tissues, highlighting its utility in cancer research .

Limitations in DGK5 Research

No DGK5-specific antibody is explicitly mentioned in the provided sources. Studies on Arabidopsis DGK5 rely on genetic mutants (e.g., dgk5.1) or tagged constructs (e.g., GFP-DGK5) . PA quantification and ROS assays are used to infer DGK5 activity .

Comparative Analysis of DGK Isoforms

Research Findings and Implications

• DGK5 in Dual Immunity:

  • DGK5 regulates both pattern-triggered immunity (PTI) and effector-triggered immunity (ETI) in plants. Phosphorylation by BIK1 (a kinase) activates DGK5, while MPK4 phosphorylates it to suppress PA production, fine-tuning immune responses .

  • Exogenous PA rescues ROS defects in dgk5 mutants, confirming its role in RBOHD stabilization .

• DGKζ as a Therapeutic Target:

  • Inhibiting DGKζ potentiates antitumor T-cell responses, making it a candidate for cancer immunotherapy .

Future Directions

• Antibody Development: A specific DGK5 antibody would advance plant immunity studies by enabling protein localization and interaction analyses.

• Clinical Translation: Targeting DGKζ with inhibitors or antibodies could enhance immune responses in cancer while mitigating autoimmune risks .