IgGZERO® (EndoS)

IgGZERO (EndoS) is an IgG-specific endoglycosidase acting on complex type N-glycans at the Fc-glycosylation site of IgG. The enzyme acts on the chitobiose core and leaves the core GlcNAc intact.

Available in three different product formats:

Product Information

IgGZERO (EndoS) is an endoglycosidase from Streptococcus pyogenes that specifically hydrolyzes N-linked glycans in the Fc-region of native IgG. It can be used to rapidly deglycosylate antibodies to reduce sample complexity, or to inactivate Fc-mediated effector functions.

The Enzyme deglycosylates all human IgG subclasses, and IgGs from many different species, including mouse, rat, monkey, sheep, goat, cow, and horse. The enzyme only hydrolyzes glycans from the Fc-domain of IgG, even when other glycosylated proteins are present in the solution. The enzyme is expressed in E. coli, contains a His-tag, and the molecular weight is 110 kDa.

The IgGZERO enzyme has limited activity on high-mannose and hybrid-type glycans (Sjögren et al., 2015). If you are interested in endoglycosidases that hydrolyze all glycoforms on IgG, we recommend the GlycINATOR product family.

Sjögren, J. et al., 2015. EndoS and EndoS2 hydrolyze Fc-glycans on therapeutic antibodies with different glycoform selectivity and can be used for rapid quantification of high-mannose glycans. Glycobiology, 25(10), pp.1053–1063.

Key Characteristics

  • Human IgG1-4, Fc-fusion proteins, IgG from mouse, rat, monkey, sheep, goat, cow and horse
  • 30 min reaction
  • Requires native IgG fold
  • Complex Fc glycoforms, limited activity on high-mannose and hybrid-type glycans


  • Level of afucosylation
    Afucosylation of the IgG glycans has substantial impact on the effector functions of the antibody and IgGZERO can be applied to study the degree of core fucosylation.
  • Inactivating antibodies
    Removal of IgG glycans using IgGZERO has been proposed to reduce antibody binding to its Fc receptors.

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Product Formats

IgGZERO® Enzyme

Enzyme supplied as lyophilized powder. The enzyme is available in 1000 and 5000 unit formats (1 unit digest 1 µg IgG).


Enzyme lyophilized for endotoxin-sensitive assays. This product formulation has low levels of endotoxins per vial (< 0.2 EU). Available in 2000 unit vials.

Immobilized IgGZERO® - deGlycIT™

deGlycIT is IgGZERO enzyme immobilized on agarose allowing for antibody Fc deglycosylation without contaminating the final preparation with IgGZERO enzyme.

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External References and Reference Tool

IgGZERO references


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Smart Enzyme Reference Tool

SmartEnzyme Reference Tool

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First you could increase incubation time and increase temperature to 37°C.

Another explanation for not complete deglycosylation could be if the antibody has higher amounts of high-mannose, some hybrid glycans or bisected glycans. For these glycans IgGZERO has low or no activity. Especially, high-mannose glycans are particular resistant to digestion.

If longer incubation time and increased temperature does not increase deglycsylation we would recommend you to try our other endoglycosidase GlycINATOR (EndoS2). This enzyme has much higher activity on these types of glycans sometimes seen in m.Abs.

Yes, many buffers are compatible with IgGZERO/DeGlycIT. Please keep pH close to neutral.

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Genovis products are intended for research use only. They are not intended to be used for therapeutic or diagnostic purposes in humans or animals.