MARCH2 Antibody

Introduction to MARCH2 Protein

MARCH2 (Membrane-Associated RING-CH 2) is an E3 ubiquitin ligase belonging to the MARCH protein family, which regulates cell-surface protein turnover through ubiquitination . It plays a critical role in antiviral immunity, particularly against HIV-1, by restricting viral envelope glycoprotein incorporation into nascent virions and inhibiting viral entry . Human MARCH2 exhibits distinct antiviral properties compared to its murine ortholog due to evolutionary adaptations, such as the presence of Gly61, a residue critical for its HIV-1 restriction function .

Development and Characteristics of MARCH2 Antibody

The MARCH2 Antibody (NBP1-60051) from Bio-Techne is a polyclonal rabbit IgG antibody designed for detecting human MARCH2 in Western blot applications .

Mechanism of Antiviral Action:

MARCH2 inhibits HIV-1 through two distinct mechanisms:

1. RING-CH-Dependent Envelope Exclusion: Reduces HIV-1 Env (gp120/gp41) incorporation into virions by ubiquitinating viral glycoproteins .

2. RING-CH-Independent Fusion Blockade: Incorporated into virions to disrupt virus-cell membrane fusion during entry .

Cell-Type Specificity:

MARCH2 restricts HIV-1 replication exclusively in CD4+ T cells, with no effect in monocyte-derived macrophages (MDMs) . It reduces cell-to-cell transmission by 5-fold in primary T cells .

Applications in Scientific Research

• HIV-1 Restriction Studies: Used to quantify MARCH2-mediated Env depletion in virions and assess its role in viral fusion .

• Protein Localization: Identifies MARCH2’s subcellular redistribution during HIV-1 infection, including plasma membrane co-localization with viral Gag .

• Functional Knockdown: Validates endogenous MARCH2’s role in primary T cells using shRNA-depletion models .

Technical Validation and Limitations

• Western Blot Performance: Detects endogenous MARCH2 in Jurkat and H9 T cell lines, with ~80–90% knockdown efficiency in shRNA models .

• Limitations:

  • Cross-reactivity with MARCH3 (64% sequence similarity) is unconfirmed .

  • Not validated for immunofluorescence or flow cytometry due to antibody limitations .