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Antibody-photocatalyst conjugate labeling, Microenvironment mapping technology, Photoinduced proximity labeling kit, Protein-protein interaction elucidation technology

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General description

The Atlas MicroMap Kit is a highly precise proximity labeling platform for elucidation of protein-protein interactions on cell membranes. Using an antibody specific to a protein target, the Atlas MicroMap kit crosslinks proteins within a 4 nm radius to identify only those that are within the proximity of the target of interest. The kit contains necessary reagents for performing photoinduced proximity labeling using the Atlas system. The procedures are adopted from those published by the MacMillan Lab in Science . Two sizes of kit are available providing enough antibody conjugate for either 10 reactions (AtlasKit-A) or 20 reactions (AtlasKit-B).

The kit provides a step-by-step procedure for conjugating your antibody to a photocatalyst that localizes light-mediated crosslinking to the antibody′s target and surrounding proteins. First, an azide-containing linker is appended to your antibody that ″clicks″ on an iridium photocatalyst. The resulting antibody-photocatalyst conjugate is added to live cells along with a biotinylated diazirine reagent. Analogous to a satelite, the photocatalyst localizes carbene generation from the diazirine and thus covalently modifies surrounding proteins. The biotin tag allows for enrichment of photo-labeled proteins. As shown in Geri et al., the extent of this photo-induced labeling is within a 4 nm radius of the photocatalyst, providing advanced precision for mapping protein interaction networks.

Read more about micromapping in our Technology Spotlight

Protocol available here

  • Conjugation reagents and buffers, photocatalyst, photo-reactive diazirine-biotin, fluorescent standard for validation

Not included:
  • Antibodies (primary, secondary, isotype)
  • Light-irradiating photoreactor (suggestions below)
  • Protein concentration assay (BCA assay recommended)
  • Plate reader
  • Spin desalting columns (7K MWCO, 2 mL recommended)

Photoreactors commercially available:
  • Penn PhD Photoreactor M2 (Z744035)
  • Penn PhD Photoreactor M2 365nm Light Source (Z744031)
  • LightOX PhotoReact 365 (Z744061)


Proximity protein labeling, protein-protein interactions, photoaffinity labeling, proteomics

Biochem/physiol Actions

Kit of components packaged in individual vials for enabling photoinduced proximity labeling. Kit includes reagents for antibody conjugation, click chemistry, and photo-labeling of protein. Chemistry is compatible with customer-specific antibody (not supplied as part of kit) for proteins of interest. Kits are available for either 10 reactions (AtlasKit-A) or 20 reactions (AtlasKit-B).

Storage Class Code

10 - Combustible liquids



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A novel method has been developed to tag antibodies with a photoreactive iridium catalyst. Light activates the catalyst to convert a diazirine compound into a reactive carbene intermediate that can label membrane proteins in close proximity. The diazirine adds a biotin to the targeted proteins to allow for capture experiments.

In cases where photoaffinity labeling (PAL) probes are ineffective, Hyas and Dione Kits provide an effective method for small molecule identification by using an Iridium photocatalyst tethered to the molecule under investigation.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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