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Updated: Oct 31, 2025

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Cryptic association of B7-2 molecules and its implication for clustering

Swetha Lankipalli1,2, Mahadeva Swamy H S3, Deepak Selvam4,5

  • 1Biological Sciences Division, Poornaprajna Institute of Scientific Research (PPISR), Bengaluru, India.

Protein Science : a Publication of the Protein Society
|June 30, 2021
PubMed

Insights

The B7-2 protein forms unique 1D zipper arrays on cell surfaces, explaining its clustering and signaling. This discovery offers insights into T-cell co-stimulation for treating cancer and autoimmunity.

Area of Science:

  • Immunology
  • Structural Biology
  • Cell Biology

Background:

  • The CD28/CTLA4:B7-1/B7-2 axis is crucial for T-cell co-stimulation, impacting autoimmunity and cancer therapies.
  • The precise cell surface organization and signaling mechanisms of B7-2 remain incompletely understood.

Purpose of the Study:

  • To elucidate the structural basis of B7-2 oligomerization and cell surface clustering.
  • To investigate the physiological relevance of B7-2's pre-signaling state.

Main Methods:

  • X-ray crystallography to determine the IgV domain structure of B7-2.
  • Super-resolution microscopy to visualize B7-2 and B7-1 clustering on cell membranes.
  • Sequence and structural comparisons with other B7 family members and related complexes.

Main Results:

  • The IgV domain of B7-2 forms cryptic 1D arrays, representing a pre-signaling state.
  • B7-2 exhibits larger and more elongated clusters than B7-1 on cell surfaces.
  • Structural analysis supports the physiological importance of the B7-2 1D zipper array.

Conclusions:

  • The 1D zipper-like array structure explains B7-2's clustering, orientation, and regulated signaling.
  • This finding provides a molecular basis for understanding T-cell co-stimulation and developing targeted therapies.
Keywords:
B7-2 structureimmune checkpoint blockadeimmune receptorsprotein clustering

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