5HM7

The Intracellular domain of Butyrophilin 3A1 protein

  • Classification: IMMUNE SYSTEM
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2016-01-15 Released: 2017-07-26 
  • Deposition Author(s): Adams, E.J., Gu, S.
  • Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Phosphoantigen-induced conformational change of butyrophilin 3A1 (BTN3A1) and its implication on V gamma 9V delta 2 T cell activation.

Gu, S.Sachleben, J.R.Boughter, C.T.Nawrocka, W.I.Borowska, M.T.Tarrasch, J.T.Skiniotis, G.Roux, B.Adams, E.J.

(2017) Proc Natl Acad Sci U S A 114: E7311-E7320

  • DOI: 10.1073/pnas.1707547114
  • Primary Citation of Related Structures:  
    5HM7

  • PubMed Abstract: 
  • Human Vγ9Vδ2 T cells respond to microbial infections as well as certain types of tumors. The key initiators of Vγ9Vδ2 activation are small, pyrophosphate-containing molecules called phosphoantigens (pAgs) that are present in infected cells or accumulate intracellularly in certain tumor cells ...

    Human Vγ9Vδ2 T cells respond to microbial infections as well as certain types of tumors. The key initiators of Vγ9Vδ2 activation are small, pyrophosphate-containing molecules called phosphoantigens (pAgs) that are present in infected cells or accumulate intracellularly in certain tumor cells. Recent studies demonstrate that initiation of the Vγ9Vδ2 T cell response begins with sensing of pAg via the intracellular domain of the butyrophilin 3A1 (BTN3A1) molecule. However, it is unknown how downstream events can ultimately lead to T cell activation. Here, using NMR spectrometry and molecular dynamics (MD) simulations, we characterize a global conformational change in the B30.2 intracellular domain of BTN3A1 induced by pAg binding. We also reveal by crystallography two distinct dimer interfaces in the BTN3A1 full-length intracellular domain, which are stable in MD simulations. These interfaces lie in close proximity to the pAg-binding pocket and contain clusters of residues that experience major changes of chemical environment upon pAg binding. This suggests that pAg binding disrupts a preexisting conformation of the BTN3A1 intracellular domain. Using a combination of biochemical, structural, and cellular approaches we demonstrate that the extracellular domains of BTN3A1 adopt a V-shaped conformation at rest, and that locking them in this resting conformation without perturbing their membrane reorganization properties diminishes pAg-induced T cell activation. Based on these results, we propose a model in which a conformational change in BTN3A1 is a key event of pAg sensing that ultimately leads to T cell activation.


    Organizational Affiliation

    Committee on Cancer Biology, University of Chicago, Chicago, IL 60637.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Butyrophilin subfamily 3 member A1A, B244Homo sapiensMutation(s): 0 
Gene Names: BTN3A1BTF5
UniProt & NIH Common Fund Data Resources
Find proteins for O00481 (Homo sapiens)
Explore O00481 
Go to UniProtKB:  O00481
PHAROS:  O00481
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.43α = 90
b = 145.84β = 105.57
c = 44.91γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
iMOSFLMdata reduction
PHASERphasing
ARPmodel building
Cootmodel building

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-01-15 
  • Released Date: 2017-07-26 
  • Deposition Author(s): Adams, E.J., Gu, S.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesNIHR01-AI115471

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-11-01
    Changes: Author supporting evidence, Refinement description
  • Version 1.2: 2019-02-06
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence