Oral Presentation Lorne Infection and Immunity 2022

Recognition of host Clr-b by the inhibitory NKR-P1B receptor provides a basis for missing-self recognition (#31)

Gautham R Balaji 1 , Oscar A Aguilar 2 3 , Miho Tanaka 3 , Miguel A Shingu-Vazquez 1 , Zhihui Fu 1 , Benjamin S Gully 1 , Lewis L Lanier 2 , James R Carlyle 3 , Jamie Rossjohn 1 4 , Richard Berry 1
  1. Infection and Immunity Program, Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
  2. Department of Microbiology and Immunology, University of California, San Francisco, CA, USA
  3. Sunnybrook Research Institute, Toronto, ON M4N 3M5, Canada
  4. Institute of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK

The interaction between natural killer (NK) cell inhibitory receptors and their cognate ligands constitutes a key mechanism by which healthy tissues are protected from NK cell-mediated lysis. However, self-ligand recognition remains poorly understood within the prototypical NKR-P1 receptor family. Here we report the structure of the inhibitory NKR-P1B receptor bound to its cognate host ligand, Clr-b. NKR-P1B and Clr-b interact via a head-to-head docking mode through an interface that includes a large array of polar interactions. NKR-P1B:Clr-b recognition is extremely sensitive to mutations at the heterodimeric interface, with most mutations severely impacting both Clr-b binding and NKR-P1B receptor function to implicate a low affinity interaction. Within the structure, two NKR-P1B:Clr-b complexes are cross-linked by a non-classic NKR-P1B homodimer, and the disruption of homodimer formation abrogates Clr-b recognition. These data provide an insight into a fundamental missing-self recognition system and suggest an avidity-based mechanism underpins NKR-P1B receptor function.

 

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