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An engineered construct of cFLIP provides insight into DED1 structure and interactions

Alexandra E Panaitiu1, Tamar Basiashvili1, Dale F Mierke1

  • 1Chemistry Department, Dartmouth College, 6128 Burke Hall, Hanover, NH 03755, USA.

Structure (London, England : 1993)
|November 20, 2021
PubMed

Insights

Cellular FLICE-like inhibitory protein (cFLIP) DED1 structure reveals how it binds FADD and calmodulin. These interactions are key to regulating apoptosis and understanding the assembly of death-inducing signaling complex (DISC) filaments.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Cellular FLICE-like inhibitory protein (cFLIP) is crucial in apoptosis regulation and implicated in cancer and autoimmune diseases.
  • cFLIP isoforms control extrinsic apoptosis by modulating procaspase-8 activation within the death-inducing signaling complex (DISC).
  • The protein's function relies on interactions mediated by its N-terminal death effector domains (DEDs).

Purpose of the Study:

  • To determine the structure of the engineered DED1 domain of cFLIP.
  • To elucidate the protein-protein interactions of cFLIP DED1 with FADD and calmodulin.
  • To understand the role of DED1 in cFLIP function within the DISC.

Main Methods:

  • Solution nuclear magnetic resonance (NMR) spectroscopy was employed to solve the structure of the engineered cFLIP DED1 domain.
  • Protein-protein interaction studies were conducted to define binding interfaces with FADD and calmodulin.

Main Results:

  • The structure of cFLIP DED1 was determined, revealing a canonical DED fold comprising six alpha helices.
  • Two distinct binding interfaces on cFLIP DED1 were identified for calmodulin and FADD.
  • The study confirmed the critical role of DED1 in mediating the association between cFLIP and FADD.

Conclusions:

  • The DED1 domain of cFLIP possesses a defined structure that facilitates interactions with both FADD and calmodulin.
  • These interactions are essential for regulating cFLIP's function in the DISC.
  • The findings provide insights into the molecular mechanisms underlying DISC filament assembly.
Keywords:
FADD/cFLIP interactionNMR-based structure and dynamicsdeath effector domaindeath-inducing signaling complexhuman cFLIP

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