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Structure of an extended β3 integrin.

Dongwen Zhou1, Aye Myat Myat Thinn1,2, Yan Zhao1,3

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High-resolution structures of β₃ integrin reveal intermediate and extended conformations, clarifying how extension occurs. The Leu33Pro polymorphism does not directly impact integrin conformation or ligand binding.

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Area of Science:

  • Structural biology
  • Cellular signaling
  • Integrin biology

Background:

  • Integrins are crucial cell adhesion receptors that mediate communication with the extracellular environment.
  • Activation of integrins involves a conformational change from a bent to an extended state, influencing cellular signaling.
  • β₃ integrins, such as αIIbβ3 and αVβ3, are well-studied prototypes for understanding integrin structure and function, yet high-resolution structures in extended conformations are lacking.

Purpose of the Study:

  • To determine the high-resolution crystal structure of the β₃ integrin headpiece in both Leu33 and Pro33 forms.
  • To elucidate the structural mechanisms underlying β₃ integrin extension and the flexibility of its domains.
  • To investigate the impact of the Leu33Pro polymorphism on β₃ integrin conformation and function, particularly concerning HPA-1a alloantibody binding.

Main Methods:

  • X-ray crystallography was used to determine the structure of the β₃ integrin headpiece (Leu33 and Pro33 forms).
  • High-resolution structures of full-length β₃ integrin were built based on crystal structures and validated with electron microscopy data.
  • Conformational changes in specific domains (PSI and I-EGF1) upon extension were analyzed.

Main Results:

  • Crystal structures revealed coexisting intermediate and fully extended conformations of the β₃ integrin headpiece.
  • High-resolution structures of full-length β₃ integrin in extended states were successfully generated, consistent with electron microscopy.
  • The study identified the β-knee region as key to β₃ integrin extension and elucidated the determinants of β-leg domain flexibility.
  • Conformational changes in the PSI and I-EGF1 domains during extension were observed.
  • Functional data indicated that the Leu33Pro substitution does not directly alter β₃ integrin conformation or ligand binding.

Conclusions:

  • The study provides the first high-resolution structures of β₃ integrin in extended conformations, revealing key extension mechanisms.
  • The Leu33Pro polymorphism, while defining HPA-1a/b antigens, does not directly influence β₃ integrin structure or ligand binding.
  • These findings advance the understanding of integrin conformational dynamics and the structural basis of HPA-1a alloantibody interactions.